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{"segment":[{"time":24,"part":[{"title":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","title_trans":"","temp":"multiple_choice","correct":[[1]],"list":[{"point":5,"ques":" <center><img src='https://www.luyenthi123.com/file/luyenthi123/lop6/toan/daiso/bai16/lv2/img\/4.jpg' \/><\/center> <br\/> BCNN(72; 20; 12) = ?","select":["A. 360","B. 720","C. 1440","D. 280"],"hint":"","explain":"<span class='basic_left'><span class='basic_green'>H\u01b0\u1edbng d\u1eabn:<\/span><br\/> <b> B\u01b0\u1edbc 1: <\/b> Ph\u00e2n t\u00edch 72; 20; 12 ra th\u1eeba s\u1ed1 nguy\u00ean t\u1ed1 <br\/> <b> B\u01b0\u1edbc 2: <\/b> Ch\u1ecdn th\u1eeba s\u1ed1 nguy\u00ean t\u1ed1 chung v\u00e0 ri\u00eang c\u1ee7a 72; 20 v\u00e0 12 <br\/> <b> B\u01b0\u1edbc 3: <\/b> L\u1eadp t\u00edch c\u00e1c th\u1eeba s\u1ed1 nguy\u00ean t\u1ed1 chung v\u00e0 ri\u00eang m\u1ed7i th\u1eeba s\u1ed1 l\u1ea5y v\u1edbi s\u1ed1 m\u0169 l\u1edbn nh\u1ea5t <br\/> T\u00edch d\u00f3 ch\u00ednh l\u00e0 BCNN c\u1ea7n t\u00ecm <\/span> <br\/><br\/> <span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span> <br\/> Ta c\u00f3: $72 = 2^3 . 3^2$; $20 = 2^2 . 5$ ; $12 = 2^2 . 3$ <br\/> $\\Rightarrow$ BCNN(72; 20; 12) = $2^3 . 3^2 . 5 = 360$ <br\/> <span class='basic_pink'> V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0: A. 360<\/span> ","column":2}]}],"id_ques":771},{"time":24,"part":[{"title":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","title_trans":"","temp":"multiple_choice","correct":[[2]],"list":[{"point":5,"ques":" <center><img src='https://www.luyenthi123.com/file/luyenthi123/lop6/toan/daiso/bai16/lv2/img\/4.jpg' \/><\/center> <br\/> BCNN(12; 8; 15) = ?","select":["A. 240","B. 120","C. 600","D. 360"],"hint":"","explain":"<span class='basic_left'><span class='basic_green'>H\u01b0\u1edbng d\u1eabn:<\/span><br\/> <b> B\u01b0\u1edbc 1: <\/b> Ph\u00e2n t\u00edch 12; 8; 15 ra th\u1eeba s\u1ed1 nguy\u00ean t\u1ed1 <br\/> <b> B\u01b0\u1edbc 2: <\/b> Ch\u1ecdn th\u1eeba s\u1ed1 nguy\u00ean t\u1ed1 chung v\u00e0 ri\u00eang c\u1ee7a 12; 8 v\u00e0 15<br\/> <b> B\u01b0\u1edbc 3: <\/b> L\u1eadp t\u00edch c\u00e1c th\u1eeba s\u1ed1 nguy\u00ean t\u1ed1 chung v\u00e0 ri\u00eang m\u1ed7i th\u1eeba s\u1ed1 l\u1ea5y v\u1edbi s\u1ed1 m\u0169 l\u1edbn nh\u1ea5t <br\/> \u0110\u00f3 ch\u00ednh l\u00e0 BCNN c\u1ea7n t\u00ecm <\/span> <br\/><br\/> <span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span> <br\/> Ta c\u00f3: $12 = 2^2 . 3$ ; $8 = 2^3$ ; $15 = 3 . 5$ <br\/> $\\Rightarrow$ BCNN(12; 8; 15) = $2^3 . 3 . 5 = 120$ <br\/> <span class='basic_pink'> V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0: B. 120<\/span> ","column":2}]}],"id_ques":772},{"time":24,"part":[{"title":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","title_trans":"","temp":"multiple_choice","correct":[[3]],"list":[{"point":5,"ques":" <center><img src='https://www.luyenthi123.com/file/luyenthi123/lop6/toan/daiso/bai16/lv2/img\/4.jpg' \/><\/center> <br\/> BCNN(14; 9; 72) = ?","select":["A. 252","B. 378","C. 504","D. 126"],"hint":"","explain":"<span class='basic_left'><span class='basic_green'>H\u01b0\u1edbng d\u1eabn:<\/span><br\/> <b> B\u01b0\u1edbc 1: <\/b> Ph\u00e2n t\u00edch 14; 9; 7 ra th\u1eeba s\u1ed1 nguy\u00ean t\u1ed1 <br\/> <b> B\u01b0\u1edbc 2: <\/b> Ch\u1ecdn th\u1eeba s\u1ed1 nguy\u00ean t\u1ed1 chung v\u00e0 ri\u00eang c\u1ee7a 14; 9 v\u00e0 7<br\/> <b> B\u01b0\u1edbc 3: <\/b> L\u1eadp t\u00edch c\u00e1c th\u1eeba s\u1ed1 nguy\u00ean t\u1ed1 chung v\u00e0 ri\u00eang m\u1ed7i th\u1eeba s\u1ed1 l\u1ea5y v\u1edbi s\u1ed1 m\u0169 l\u1edbn nh\u1ea5t <br\/> \u0110\u00f3 ch\u00ednh l\u00e0 BCNN c\u1ea7n t\u00ecm <\/span> <br\/><br\/> <span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span> <br\/> Ta c\u00f3: $14 = 2 . 7$ ; $9 = 3^2$ ; $72 = 2^3 . 3^2$ <br\/> $\\Rightarrow$ BCNN(14; 9; 72) = $2^3 . 3^2 . 7 = 504$ <br\/> <span class='basic_pink'> V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0: C. 504<\/span> ","column":2}]}],"id_ques":773},{"time":24,"part":[{"title":"\u0110i\u1ec1n s\u1ed1 th\u00edch h\u1ee3p v\u00e0o ch\u1ed7 tr\u1ed1ng","title_trans":"","temp":"fill_the_blank","correct":[[["504"]]],"list":[{"point":5,"width":60,"content":"","type_input":"","ques":"<center><img src='https://www.luyenthi123.com/file/luyenthi123/lop6/toan/daiso/bai16/lv2/img\/10.jpg' \/><\/center> <br\/> S\u1ed1 h\u1ecdc sinh kh\u1ed1i 6 c\u1ee7a tr\u01b0\u1eddng A l\u00e0 m\u1ed9t s\u1ed1 t\u1ef1 nhi\u00ean c\u00f3 3 ch\u1eef s\u1ed1. M\u1ed7i khi x\u1ebfp h\u00e0ng 18, h\u00e0ng 21, h\u00e0ng 24 \u0111\u1ec1u v\u1eeba \u0111\u1ee7 h\u00e0ng. T\u00ecm s\u1ed1 h\u1ecdc sinh kh\u1ed1i 6 c\u1ee7a tr\u01b0\u1eddng A. <br\/> \u0110\u00e1p s\u1ed1: _input_ h\u1ecdc sinh ","hint":"","explain":" <span class='basic_left'><span class='basic_green'>H\u01b0\u1edbng d\u1eabn:<\/span><br\/> V\u00ec s\u1ed1 h\u1ecdc sinh kh\u1ed1i 6 c\u1ee7a tr\u01b0\u1eddng khi x\u1ebfp h\u00e0ng 18, h\u00e0ng 21 v\u00e0 h\u00e0ng 24 \u0111\u1ec1u \u0111\u1ee7 h\u00e0ng n\u00ean s\u1ed1 h\u1ecdc sinh chia h\u1ebft cho 18; 21 v\u00e0 24 <br\/> Hay s\u1ed1 h\u1ecdc sinh thu\u1ed9c BC(18; 21; 24) v\u00e0 l\u00e0 s\u1ed1 c\u00f3 3 ch\u1eef s\u1ed1 <\/span> <br\/><br\/> <span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span><br\/> G\u1ecdi s\u1ed1 h\u1ecdc sinh kh\u1ed1i 6 c\u1ee7a tr\u01b0\u1eddng A l\u00e0 x (x l\u00e0 s\u1ed1 c\u00f3 3 ch\u1eef s\u1ed1) <br\/> V\u00ec khi x\u1ebfp h\u00e0ng 18, h\u00e0ng 21 hay h\u00e0ng 24 \u0111\u1ec1u v\u1eeba \u0111\u1ee7 h\u00e0ng n\u00ean: <br\/> x $\\vdots$ 18; x $\\vdots$ 21; x $\\vdots$ 24 n\u00ean x $\\in$ BC(18; 21; 24) <br\/> Ta c\u00f3: $18 = 2 . 3^2$ ; $21 = 3 . 7$ ; $24 = 2^3 . 3$ <br\/> $\\Rightarrow$ BCNN(18; 21; 24) = $2^3 . 3^2 . 7 = 504$ <br\/> $\\Rightarrow$ x $\\in$ BC(18; 21; 24) = {0; 504; 1008; 1512;...} <br\/> V\u00ec x l\u00e0 s\u1ed1 c\u00f3 3 ch\u1eef s\u1ed1 n\u00ean x = 504 <br\/> V\u1eady kh\u1ed1i 6 c\u1ee7a tr\u01b0\u1eddng A c\u00f3 504 h\u1ecdc sinh<br\/> <span class='basic_pink'> \u0110\u00e1p s\u1ed1: 504 h\u1ecdc sinh <\/span> <br\/><span class='basic_green'> <i> L\u01b0u \u00fd: Mu\u1ed1n t\u00ecm t\u1eadp h\u1ee3p c\u00e1c b\u1ed9i chung ta c\u00f3 th\u1ec3 t\u00ecm BCNN c\u1ee7a c\u00e1c s\u1ed1 \u0111\u00f3 r\u1ed3i l\u1ea5y BCNN nh\u00e2n l\u1ea7n l\u01b0\u1ee3t v\u1edbi c\u00e1c s\u1ed1 0; 1; 2; 3;... \u0111\u1ec3 \u0111\u01b0\u1ee3c t\u1eadp h\u1ee3p c\u00e1c b\u1ed9i chung <\/i><\/span>"}]}],"id_ques":774},{"time":24,"part":[{"title":"\u0110i\u1ec1n s\u1ed1 th\u00edch h\u1ee3p v\u00e0o ch\u1ed7 tr\u1ed1ng","title_trans":"","temp":"fill_the_blank","correct":[[["24"]]],"list":[{"point":5,"width":60,"content":"","type_input":"","ques":"<center><img src='https://www.luyenthi123.com/file/luyenthi123/lop6/toan/daiso/bai16/lv2/img\/10.jpg' \/><\/center> <br\/>Huy, H\u00f9ng, Uy\u00ean \u0111\u1ebfn c\u00e2u l\u1ea1c b\u1ed9 th\u1ec3 d\u1ee5c \u0111\u1ec1u \u0111\u1eb7n. Huy c\u1ee9 12 ng\u00e0y \u0111\u1ebfn m\u1ed9t l\u1ea7n, H\u00f9ng c\u1ee9 6 ng\u00e0y \u0111\u1ebfn m\u1ed9t l\u1ea7n, Uy\u00ean c\u1ee9 8 ng\u00e0y \u0111\u1ebfn m\u1ed9t l\u1ea7n. H\u1ecfi sau bao l\u00e2u th\u00ec 3 b\u1ea1n l\u1ea1i g\u1eb7p nhau \u1edf c\u00e2u l\u1ea1c b\u1ed9 l\u1ea7n th\u1ee9 2? Bi\u1ebft 3 b\u1ea1n c\u00f9ng tham gia c\u00e2u l\u1ea1c b\u1ed9 th\u1ec3 d\u1ee5c m\u1ed9t ng\u00e0y.<br\/> \u0110\u00e1p s\u1ed1: _input_ ng\u00e0y ","hint":"S\u1ed1 ng\u00e0y = BCNN(12; 6; 8)","explain":" <span class='basic_left'><span class='basic_green'>H\u01b0\u1edbng d\u1eabn:<\/span><br\/> N\u1ebfu s\u1ed1 ng\u00e0y \u0111\u1ec3 3 b\u1ea1n c\u00f9ng tham gia c\u00e2u l\u1ea1c b\u1ed9 l\u00e0 x (ng\u00e0y) <br\/> Th\u00ec ta c\u00f3 x $\\vdots$ 12; x $\\vdots$ 6 v\u00e0 x $\\vdots$ 8 <br\/> V\u1eady x c\u1ea7n t\u00ecm ch\u00ednh l\u00e0 BCNN(12; 6; 8) <\/span> <br\/><br\/> <span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span><br\/> G\u1ecdi s\u1ed1 ng\u00e0y \u0111\u1ec3 c\u1ea3 3 b\u1ea1n c\u00f9ng tham gia c\u00e2u l\u1ea1c b\u1ed9 l\u00e0 x (ng\u00e0y) (x > 12) <br\/> V\u00ec Huy c\u1ee9 12 ng\u00e0y tham gia c\u00e2u l\u1ea1c b\u1ed9 m\u1ed9t l\u1ea7n n\u00ean x $\\vdots$ 12 <br\/> H\u00f9ng c\u1ee9 6 ng\u00e0y tham gia c\u00e2u l\u1ea1c b\u1ed9 1 l\u1ea7n n\u00ean x $\\vdots$ 6 <br\/> Uy\u00ean c\u1ee9 8 ng\u00e0y tham gia c\u00e2u l\u1ea1c b\u1ed9 1 l\u1ea7n n\u00ean x $\\vdots$ 8 <br\/> $\\Rightarrow$ x $\\in$ BC(12; 6; 8) <br\/> V\u00ec l\u1ea7n \u0111\u1ea7u 3 b\u1ea1n c\u00f9ng tham gia c\u00e2u l\u1ea1c b\u1ed9 1 ng\u00e0y <br\/> N\u00ean s\u1ed1 ng\u00e0y \u0111\u1ec3 3 b\u1ea1n c\u00f9ng tham gia c\u00e2u l\u1ea1c b\u1ed9 l\u1ea7n 2 l\u00e0: x = BCNN(12; 6; 8) <br\/> Ta c\u00f3: $12 = 2^2 . 3$ ; $6 = 2 . 3$ ; $8 = 2^3$ <br\/> $\\Rightarrow$ x = BCNN(12; 6; 8) = $2^3 . 3 = 24$ <br\/> V\u1eady sau 24 ng\u00e0y th\u00ec hai b\u1ea1n l\u1ea1i c\u00f9ng tham gia c\u00e2u l\u1ea1c b\u1ed9 l\u1ea7n th\u1ee9 2 <br\/> <span class='basic_pink'> \u0110\u00e1p s\u1ed1: 24 ng\u00e0y <\/span> "}]}],"id_ques":775},{"time":24,"part":[{"title":"\u0110i\u1ec1n s\u1ed1 th\u00edch h\u1ee3p v\u00e0o ch\u1ed7 tr\u1ed1ng","title_trans":"","temp":"fill_the_blank","correct":[[["120"]]],"list":[{"point":5,"width":60,"content":"","type_input":"","ques":"<center><img src='https://www.luyenthi123.com/file/luyenthi123/lop6/toan/daiso/bai16/lv2/img\/8.jpg' \/><\/center> <br\/>C\u00f3 3 ch\u1ed3ng s\u00e1ch To\u00e1n, \u00c2m nh\u1ea1c, V\u0103n. M\u1ed7i ch\u1ed3ng ch\u1ec9 g\u1ed3m m\u1ed9t lo\u1ea1i s\u00e1ch. M\u1ed7i cu\u1ed1n s\u00e1ch To\u00e1n d\u00e0y 15mm, m\u1ed7i cu\u1ed1n s\u00e1ch \u00c2m nh\u1ea1c d\u00e0y 6mm, m\u1ed7i cu\u1ed1n s\u00e1ch V\u0103n d\u00e0y 8mm. Ng\u01b0\u1eddi ta x\u1ebfp sao cho 3 ch\u1ed3ng s\u00e1ch b\u1eb1ng nhau. T\u00ednh chi\u1ec1u cao nh\u1ecf nh\u1ea5t c\u1ee7a 3 ch\u1ed3ng s\u00e1ch \u0111\u00f3.<br\/> \u0110\u00e1p s\u1ed1: _input_ mm ","hint":"Chi\u1ec1u cao nh\u1ecf nh\u1ea5t c\u1ee7a 3 ch\u1ed3ng s\u00e1ch = BCNN(15; 8; 6)","explain":" <span class='basic_left'><span class='basic_green'>H\u01b0\u1edbng d\u1eabn:<\/span><br\/> N\u1ebfu chi\u1ec1u cao nh\u1ecf nh\u1ea5t c\u1ee7a 3 ch\u1ed3ng s\u00e1ch l\u00e0 x <br\/> Th\u00ec ta c\u00f3: x $\\vdots$ 15; x $\\vdots$ 6; x $\\vdots$ 8 <br\/> V\u1eady x c\u1ea7n t\u00ecm ch\u00ednh l\u00e0 BCNN(15; 8; 6) <\/span> <br\/><br\/> <span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span><br\/> G\u1ecdi chi\u1ec1u cao nh\u1ecf nh\u1ea5t c\u1ee7a 3 ch\u1ed3ng s\u00e1ch l\u00e0 <br\/> V\u00ec m\u1ed7i cu\u1ed1n s\u00e1ch To\u00e1n d\u00e0y 15mm n\u00ean x $\\vdots$ 15 <br\/> M\u1ed7i cu\u1ed1n s\u00e1ch \u00c2m nh\u1ea1c d\u00e0y 6mm n\u00ean x $\\vdots$ 6 <br\/> M\u1ed7i cu\u1ed1n s\u00e1ch V\u0103n d\u00e0y 8mm n\u00ean x $\\vdots$ 8 <br\/> $\\Rightarrow$ x = BCNN(15; 6; 8) <br\/> Ta c\u00f3: $15 = 3 . 5$ ; $6 = 2 . 3$ ; $8 = 2^3$ <br\/> $\\Rightarrow$ x = BCNN(15; 6; 8) = $2^3 . 3 . 5 = 120$ <br\/> V\u1eady chi\u1ec1u cao nh\u1ecf nh\u1ea5t \u0111\u1ec3 3 ch\u1ed3ng s\u00e1ch cao b\u1eb1ng nhau l\u00e0 120mm <br\/> <span class='basic_pink'> \u0110\u00e1p s\u1ed1: 120 mm <\/span> "}]}],"id_ques":776},{"time":24,"part":[{"title":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","title_trans":"","temp":"multiple_choice","correct":[[3]],"list":[{"point":5,"ques":" <center><img src='https://www.luyenthi123.com/file/luyenthi123/lop6/toan/daiso/bai16/lv2/img\/12.jpg' \/><\/center> <br\/> T\u00ecm x nh\u1ecf nh\u1ea5t bi\u1ebft x $\\vdots$ 12; x $\\vdots$ 25; x $\\vdots$ 36?","select":["A. x = 600","B. x = 720","C. x = 900","D. x = 180"],"hint":"x = BCNN(12; 25; 36)","explain":"<span class='basic_left'><span class='basic_green'>H\u01b0\u1edbng d\u1eabn:<\/span><br\/> V\u00ec x nh\u1ecf nh\u1ea5t, x $\\vdots$ 12; x $\\vdots$ 25 v\u00e0 x $\\vdots$ 36 n\u00ean x = BCNN(12; 25; 36) <br\/> <b> B\u01b0\u1edbc 1: <\/b> Ph\u00e2n t\u00edch 12; 25; 36 ra th\u1eeba s\u1ed1 nguy\u00ean t\u1ed1 <br\/> <b> B\u01b0\u1edbc 2: <\/b> Ch\u1ecdn th\u1eeba s\u1ed1 nguy\u00ean t\u1ed1 chung v\u00e0 ri\u00eang c\u1ee7a 12; 25 v\u00e0 36 <br\/> <b> B\u01b0\u1edbc 3: <\/b> L\u1eadp t\u00edch c\u00e1c th\u1eeba s\u1ed1 nguy\u00ean t\u1ed1 chung v\u00e0 ri\u00eang m\u1ed7i th\u1eeba s\u1ed1 l\u1ea5y v\u1edbi s\u1ed1 m\u0169 l\u1edbn nh\u1ea5t <br\/> \u0110\u00f3 ch\u00ednh l\u00e0 s\u1ed1 c\u1ea7n t\u00ecm <\/span> <br\/><br\/> <span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span> <br\/> V\u00ec x $\\vdots$ 12; x $\\vdots$ 25; x $\\vdots$ 36 v\u00e0 x nh\u1ecf nh\u1ea5t n\u00ean x = BCNN(12; 25; 36) <br\/> Ta c\u00f3: $12 = 2^2 . 3$ ; $25 = 5^2$ ; $36 = 2^2 . 3^2$ <br\/> $\\Rightarrow$ x = BCNN(12; 25; 36) = $2^2 . 3^2 . 5^2 = 900$ <br\/> <span class='basic_pink'> V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0: C. 900 <\/span> ","column":2}]}],"id_ques":777},{"time":24,"part":[{"title":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","title_trans":"","temp":"multiple_choice","correct":[[2]],"list":[{"point":5,"ques":" <center><img src='https://www.luyenthi123.com/file/luyenthi123/lop6/toan/daiso/bai16/lv2/img\/12.jpg' \/><\/center> <br\/> T\u00ecm x nh\u1ecf nh\u1ea5t bi\u1ebft x $\\vdots$ 16; x $\\vdots$ 12; x $\\vdots$ 20?","select":["A. x = 120","B. x = 240","C. x = 280","D. x = 360"],"hint":"x = BCNN(16; 12; 20)","explain":"<span class='basic_left'><span class='basic_green'>H\u01b0\u1edbng d\u1eabn:<\/span><br\/> V\u00ec x nh\u1ecf nh\u1ea5t, x $\\vdots$ 12; x $\\vdots$ 16 v\u00e0 x $\\vdots$ 20 n\u00ean x = BCNN(12; 16; 20) <br\/> <b> B\u01b0\u1edbc 1: <\/b> Ph\u00e2n t\u00edch 12; 16; 20 ra th\u1eeba s\u1ed1 nguy\u00ean t\u1ed1 <br\/> <b> B\u01b0\u1edbc 2: <\/b> Ch\u1ecdn th\u1eeba s\u1ed1 nguy\u00ean t\u1ed1 chung v\u00e0 ri\u00eang c\u1ee7a 12; 16 v\u00e0 20<br\/> <b> B\u01b0\u1edbc 3: <\/b> L\u1eadp t\u00edch c\u00e1c th\u1eeba s\u1ed1 nguy\u00ean t\u1ed1 chung v\u00e0 ri\u00eang m\u1ed7i th\u1eeba s\u1ed1 l\u1ea5y v\u1edbi s\u1ed1 m\u0169 l\u1edbn nh\u1ea5t <br\/> \u0110\u00f3 ch\u00ednh l\u00e0 s\u1ed1 c\u1ea7n t\u00ecm <\/span> <br\/><br\/> <span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span> <br\/> V\u00ec x $\\vdots$ 16; x $\\vdots$ 12; x $\\vdots$ 20 v\u00e0 x nh\u1ecf nh\u1ea5t n\u00ean x = BCNN(16; 12; 20) <br\/> Ta c\u00f3: $16 = 2^4 $ ; $12 = 2^2 . 3$ ; $20 = 2^2 . 5$ <br\/> $\\Rightarrow$ x = BCNN(16; 12; 20) = $2^4 . 3 . 5 = 240$ <br\/> <span class='basic_pink'> V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0: B. 240 <\/span> ","column":2}]}],"id_ques":778},{"time":24,"part":[{"title":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","title_trans":"","temp":"multiple_choice","correct":[[4]],"list":[{"point":5,"ques":" <center><img src='https://www.luyenthi123.com/file/luyenthi123/lop6/toan/daiso/bai16/lv2/img\/2.jpg' \/><\/center> <br\/> T\u00ecm x nh\u1ecf nh\u1ea5t bi\u1ebft x $\\vdots$ 9; x $\\vdots$ 21; x $\\vdots$ 24?","select":["A. x = 168","B. x = 126","C. x = 528","D. x = 504"],"hint":"x = BCNN(9; 21; 24)","explain":"<span class='basic_left'><span class='basic_green'>H\u01b0\u1edbng d\u1eabn:<\/span><br\/> V\u00ec x nh\u1ecf nh\u1ea5t, x $\\vdots$ 9; x $\\vdots$ 21 v\u00e0 x $\\vdots$ 24 n\u00ean x = BCNN(9; 21; 24) <br\/> <b> B\u01b0\u1edbc 1: <\/b> Ph\u00e2n t\u00edch 9; 21; 24 ra th\u1eeba s\u1ed1 nguy\u00ean t\u1ed1 <br\/> <b> B\u01b0\u1edbc 2: <\/b> Ch\u1ecdn th\u1eeba s\u1ed1 nguy\u00ean t\u1ed1 chung v\u00e0 ri\u00eang c\u1ee7a 9; 21 v\u00e0 24 <br\/> <b> B\u01b0\u1edbc 3: <\/b> L\u1eadp t\u00edch c\u00e1c th\u1eeba s\u1ed1 nguy\u00ean t\u1ed1 chung v\u00e0 ri\u00eang m\u1ed7i th\u1eeba s\u1ed1 l\u1ea5y v\u1edbi s\u1ed1 m\u0169 l\u1edbn nh\u1ea5t <br\/> \u0110\u00f3 ch\u00ednh l\u00e0 s\u1ed1 c\u1ea7n t\u00ecm <\/span> <br\/><br\/> <span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span> <br\/> V\u00ec x $\\vdots$ 9; x $\\vdots$ 21; x $\\vdots$ 24 v\u00e0 x nh\u1ecf nh\u1ea5t n\u00ean x = BCNN(9; 21; 24) <br\/> Ta c\u00f3: $9 = 3^2 $ ; $21 = 3 . 7$ ; $24 = 2^3 . 3$ <br\/> $\\Rightarrow$ x = BCNN(9; 21; 24) = $2^3 . 3^2 . 7 = 504$ <br\/> <span class='basic_pink'> V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0: D. 504 <\/span> ","column":2}]}],"id_ques":779},{"time":24,"part":[{"title":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","title_trans":"","temp":"multiple_choice","correct":[[2]],"list":[{"point":5,"ques":" <center><img src='https://www.luyenthi123.com/file/luyenthi123/lop6/toan/daiso/bai16/lv2/img\/11.jpg' \/><\/center> <br\/> 14868 l\u00e0 b\u1ed9i chung nh\u1ecf nh\u1ea5t c\u1ee7a 36; 42 v\u00e0 58. <b> \u0110\u00daNG <\/b> hay <b> SAI <\/b>?","select":["A. \u0110\u00daNG","B. SAI"],"hint":"","explain":"<span class='basic_left'><span class='basic_green'>H\u01b0\u1edbng d\u1eabn:<\/span><br\/> T\u00ecm BCNN(36; 42; 58) r\u1ed3i ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang <br\/> <b> B\u01b0\u1edbc 1: <\/b> Ph\u00e2n t\u00edch 36; 42 v\u00e0 58 ra th\u1eeba s\u1ed1 nguy\u00ean t\u1ed1 <br\/> <b> B\u01b0\u1edbc 2: <\/b> Ch\u1ecdn th\u1eeba s\u1ed1 nguy\u00ean t\u1ed1 chung v\u00e0 ri\u00eang c\u1ee7a 36; 42 v\u00e0 58 <br\/> <b> B\u01b0\u1edbc 3: <\/b> L\u1eadp t\u00edch c\u00e1c th\u1eeba s\u1ed1 nguy\u00ean t\u1ed1 chung v\u00e0 ri\u00eang m\u1ed7i th\u1eeba s\u1ed1 l\u1ea5y v\u1edbi s\u1ed1 m\u0169 l\u1edbn nh\u1ea5t <br\/> T\u00edch \u0111\u00f3 ch\u00ednh l\u00e0 BCNN(36; 42; 58) <\/span> <br\/><br\/> <span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span> <br\/> Ta c\u00f3: $36 = 2^2 . 3^2$ ; $42 = 2 . 3 . 7$ ; $58 = 2 . 29$ <br\/> $\\Rightarrow$ BCNN(36; 42; 58) = $2^2 . 3^2 . 7 . 29 = 7308$ <br\/> V\u1eady kh\u1eb3ng \u0111\u1ecbnh \"14868 l\u00e0 BCNN c\u1ee7a 36; 42 v\u00e0 58 \" l\u00e0 <span class='basic_pink'> <b> SAI <\/b> <\/span> ","column":2}]}],"id_ques":780},{"time":24,"part":[{"title":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","title_trans":"","temp":"multiple_choice","correct":[[1]],"list":[{"point":5,"ques":" <center><img src='https://www.luyenthi123.com/file/luyenthi123/lop6/toan/daiso/bai16/lv2/img\/11.jpg' \/><\/center> <br\/> 1512 l\u00e0 b\u1ed9i chung nh\u1ecf nh\u1ea5t c\u1ee7a 24; 27 v\u00e0 42 <b> \u0110\u00daNG <\/b> hay <b> SAI <\/b>?","select":["A. \u0110\u00daNG","B. SAI"],"hint":"","explain":"<span class='basic_left'><span class='basic_green'>H\u01b0\u1edbng d\u1eabn:<\/span><br\/> T\u00ecm BCNN(24; 27; 42) r\u1ed3i ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang <br\/> <b> B\u01b0\u1edbc 1: <\/b> Ph\u00e2n t\u00edch 24; 27 v\u00e0 42 ra th\u1eeba s\u1ed1 nguy\u00ean t\u1ed1 <br\/> <b> B\u01b0\u1edbc 2: <\/b> Ch\u1ecdn th\u1eeba s\u1ed1 nguy\u00ean t\u1ed1 chung v\u00e0 ri\u00eang c\u1ee7a 24; 27 v\u00e0 42 <br\/> <b> B\u01b0\u1edbc 3: <\/b> L\u1eadp t\u00edch c\u00e1c th\u1eeba s\u1ed1 nguy\u00ean t\u1ed1 chung v\u00e0 ri\u00eang m\u1ed7i th\u1eeba s\u1ed1 l\u1ea5y v\u1edbi s\u1ed1 m\u0169 l\u1edbn nh\u1ea5t <br\/> T\u00edch \u0111\u00f3 ch\u00ednh l\u00e0 BCNN(24; 27; 42) <\/span> <br\/><br\/> <span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span> <br\/> Ta c\u00f3: $24 = 2^3 . 3$ ; $27 = 3^3$ ; $42 = 2 . 3 . 7$ <br\/> $\\Rightarrow$ BCNN(24; 27; 42) = $2^3 . 3^3. 7 = 1512$ <br\/> V\u1eady kh\u1eb3ng \u0111\u1ecbnh \"1512 l\u00e0 BCNN c\u1ee7a 24; 27 v\u00e0 42 \" l\u00e0 <span class='basic_pink'> <b> \u0110\u00daNG <\/b> <\/span> ","column":2}]}],"id_ques":781},{"time":24,"part":[{"title":"","title_trans":"","temp":"multiple_choice","correct":[[1]],"list":[{"point":5,"ques":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t <br\/> <center><img src='https://www.luyenthi123.com/file/luyenthi123/lop6/toan/daiso/bai16/lv2/img\/3.jpg' \/><\/center> ","select":["A. $504 \\in BC(18; 24; 28)$","B. $520 \\in BC(18; 24; 28)$","C. $360 \\in BC(18; 24; 28)$","D. $280 \\in BC(18; 24; 28)$"],"hint":"Ta c\u00f3 th\u1ec3 t\u00ecm BCNN(18; 24; 28) r\u1ed3i t\u00ecm t\u1eadp BC(18; 24; 28) sau \u0111\u00f3 ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang","explain":"<span class='basic_left'><span class='basic_green'>H\u01b0\u1edbng d\u1eabn:<\/span><br\/> Ta c\u00f3 th\u1ec3 t\u00ecm BCNN(18; 24; 28) r\u1ed3i t\u00ecm t\u1eadp BC(18; 24; 28) sau \u0111\u00f3 ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang <br\/> <b> B\u01b0\u1edbc 1: <\/b> Ph\u00e2n t\u00edch 18; 24; 28 ra th\u1eeba s\u1ed1 nguy\u00ean t\u1ed1 <br\/> <b> B\u01b0\u1edbc 2: <\/b> Ch\u1ecdn th\u1eeba s\u1ed1 nguy\u00ean t\u1ed1 chung v\u00e0 ri\u00eang c\u1ee7a 18; 24 v\u00e0 28 <br\/> <b> B\u01b0\u1edbc 3: <\/b> L\u1eadp t\u00edch c\u00e1c th\u1eeba s\u1ed1 nguy\u00ean t\u1ed1 chung v\u00e0 ri\u00eang m\u1ed7i th\u1eeba s\u1ed1 l\u1ea5y v\u1edbi s\u1ed1 m\u0169 l\u1edbn nh\u1ea5t <br\/> T\u00edch \u0111\u00f3 ch\u00ednh l\u00e0 BCNN(18; 24; 28) <br\/> <b> B\u01b0\u1edbc 4: <\/b> T\u00ecm t\u1eadp h\u1ee3p BC(18; 24; 28) b\u1eb1ng c\u00e1ch l\u1ea5y BCNN(18; 24; 28) nh\u00e2n l\u1ea7n l\u01b0\u1ee3t v\u1edbi 0; 1; 2; 3;... r\u1ed3i ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang <\/span> <br\/><br\/> <span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span> <br\/> Ta c\u00f3: $18 = 2 . 3^2$ ; $24 = 2^3 . 3$ ; $28 = 2^2 . 7$ <br\/> $\\Rightarrow$ BCNN(18; 24; 28) = $2^3 . 3^2 . 7 = 504$ <br\/> $\\Rightarrow$ BC(18; 24; 28) = {0; 504; 1008; 1512; 2016;...} <br\/> V\u1eady kh\u1eb3ng \u0111\u1ecbnh \" $504 \\in BC(18; 24; 28)$ \" l\u00e0 <b> \u0110\u00daNG <\/b> <br\/> <span class='basic_pink'> V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0: A<\/span> <\/span> ","column":2}]}],"id_ques":782},{"time":24,"part":[{"title":"","title_trans":"","temp":"multiple_choice","correct":[[1]],"list":[{"point":5,"ques":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t <br\/> <center><img src='https://www.luyenthi123.com/file/luyenthi123/lop6/toan/daiso/bai16/lv2/img\/3.jpg' \/><\/center> ","select":["A. $120 \\in BC(12; 20; 30)$","B. $100 \\in BC(12; 20; 30)$","C. $320 \\in BC(12; 20; 30)$","D. $160 \\in BC(12; 20; 30)$"],"hint":"Ta c\u00f3 th\u1ec3 t\u00ecm BCNN(12; 20; 30) r\u1ed3i t\u00ecm t\u1eadp BC(12; 20; 30) sau \u0111\u00f3 ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang","explain":"<span class='basic_left'><span class='basic_green'>H\u01b0\u1edbng d\u1eabn:<\/span><br\/> Ta c\u00f3 th\u1ec3 t\u00ecm BCNN(12; 20; 30) r\u1ed3i t\u00ecm t\u1eadp BC(12; 20; 30) sau \u0111\u00f3 ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang <br\/> <b> B\u01b0\u1edbc 1: <\/b> Ph\u00e2n t\u00edch 12; 20; 30 ra th\u1eeba s\u1ed1 nguy\u00ean t\u1ed1 <br\/> <b> B\u01b0\u1edbc 2: <\/b> Ch\u1ecdn th\u1eeba s\u1ed1 nguy\u00ean t\u1ed1 chung v\u00e0 ri\u00eang c\u1ee7a 12; 20 v\u00e0 30 <br\/> <b> B\u01b0\u1edbc 3: <\/b> L\u1eadp t\u00edch c\u00e1c th\u1eeba s\u1ed1 nguy\u00ean t\u1ed1 chung v\u00e0 ri\u00eang m\u1ed7i th\u1eeba s\u1ed1 l\u1ea5y v\u1edbi s\u1ed1 m\u0169 l\u1edbn nh\u1ea5t <br\/> T\u00edch \u0111\u00f3 ch\u00ednh l\u00e0 BCNN(12; 20; 30) <br\/> <b> B\u01b0\u1edbc 4: <\/b> T\u00ecm t\u1eadp h\u1ee3p BC(12; 20; 30) b\u1eb1ng c\u00e1ch l\u1ea5y BCNN(12; 20; 30) nh\u00e2n l\u1ea7n l\u01b0\u1ee3t v\u1edbi 0; 1; 2; 3;... r\u1ed3i ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang <\/span> <br\/><br\/> <span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span> <br\/> Ta c\u00f3: $12 = 2^2 . 3$ ; $20 = 2^2 . 5$ ; $30 = 2 . 3 . 5$ <br\/> $\\Rightarrow$ BCNN(12; 20; 30) = $2^2 . 3 . 5 = 60$ <br\/> $\\Rightarrow$ BC(12; 20; 30) = {0; 60; 120; 180; 240; 300; 360;...} <br\/> V\u1eady kh\u1eb3ng \u0111\u1ecbnh \" $120 \\in BC(12; 20; 30)$ \" l\u00e0 <b> \u0110\u00daNG <\/b> <br\/> <span class='basic_pink'> V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0: A<\/span> <\/span> ","column":2}]}],"id_ques":783},{"time":24,"part":[{"title":"","title_trans":"","temp":"fill_the_blank","correct":[[[">"]]],"list":[{"point":5,"width":60,"content":"","type_input":"","ques":" H\u00e3y \u0111i\u1ec1n d\u1ea5u th\u00edch h\u1ee3p v\u00e0o \u00f4 tr\u1ed1ng <br\/> <center><img src='https://www.luyenthi123.com/file/luyenthi123/lop6/toan/daiso/bai16/lv2/img\/5.jpg' \/><\/center> <br\/> $BCNN(12; 18; 21)$ _input_ $BCNN(12; 15; 30)$ ","hint":"","explain":" <span class='basic_left'><span class='basic_green'>H\u01b0\u1edbng d\u1eabn:<\/span><br\/> T\u00ecm BCNN(12; 18; 21) v\u00e0 BCNN(12; 15; 30) r\u1ed3i so s\u00e1nh <\/span> <br\/><br\/> <span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span><br\/> Ta c\u00f3: $12 = 2^2 . 3$ ; $18 = 2 . 3^2$ ; $21 = 3 . 7$ <br\/> $\\Rightarrow$ BCNN(12; 18; 21) = $2^2 . 3^2 . 7 = 252$ <br\/> $15 = 3 . 5$ ; $30 = 2 . 3 . 5$ <br\/> $\\Rightarrow$ BCNN(12; 15; 30) = $2^2 . 3 . 5 = 60$ <br\/> V\u00ec 252 > 60 n\u00ean BCNN(12; 18; 21) > BCNN(12; 15; 30) <br\/> <span class='basic_pink'> V\u1eady d\u1ea5u c\u1ea7n \u0111i\u1ec1n l\u00e0: > <\/span> "}]}],"id_ques":784},{"time":24,"part":[{"title":"","title_trans":"","temp":"fill_the_blank","correct":[[[">"]]],"list":[{"point":5,"width":60,"content":"","type_input":"","ques":" H\u00e3y \u0111i\u1ec1n d\u1ea5u th\u00edch h\u1ee3p v\u00e0o \u00f4 tr\u1ed1ng <br\/> <center><img src='https://www.luyenthi123.com/file/luyenthi123/lop6/toan/daiso/bai16/lv2/img\/10.jpg' \/><\/center> <br\/> $BCNN(8; 15; 25)$ _input_ $BCNN(15; 40; 20)$ ","hint":"","explain":" <span class='basic_left'><span class='basic_green'>H\u01b0\u1edbng d\u1eabn:<\/span><br\/> T\u00ecm BCNN(8; 15; 25) v\u00e0 BCNN(15; 40; 20) r\u1ed3i so s\u00e1nh <\/span> <br\/><br\/> <span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span><br\/> Ta c\u00f3: $8 = 2^3$ ; $15 = 3 . 5$ ; $25 = 5^2$ <br\/> $\\Rightarrow$ BCNN(8; 15; 25) = $2^3 . 3 . 5^2 = 600$ <br\/> $15 = 3 . 5$ ; $40 = 2^3 . 5$ ; $20 = 2^2 . 5$ <br\/> $\\Rightarrow$ BCNN(15; 40; 20) = $2^3 . 3 . 5 = 120$ <br\/> V\u00ec 600 > 120 n\u00ean BCNN(8; 15; 25) > BCNN(15; 40; 20) <br\/> <span class='basic_pink'> V\u1eady d\u1ea5u c\u1ea7n \u0111i\u1ec1n l\u00e0: > <\/span> "}]}],"id_ques":785},{"time":24,"part":[{"title":"\u0110i\u1ec1n s\u1ed1 th\u00edch h\u1ee3p v\u00e0o ch\u1ed7 tr\u1ed1ng","title_trans":"","temp":"fill_the_blank","correct":[[["76608"]]],"list":[{"point":5,"width":80,"content":"","type_input":"","ques":"<center><img src='https://www.luyenthi123.com/file/luyenthi123/lop6/toan/daiso/bai16/lv2/img\/13.jpg' \/><\/center> <br\/> $BCNN(27; 42; 84) + BCNN(36; 49; 86)$ = _input_ ","hint":"","explain":" <span class='basic_left'><span class='basic_green'>H\u01b0\u1edbng d\u1eabn:<\/span><br\/> T\u00ednh BCNN(27; 42; 84) = ?; BCNN(36; 49; 86) = ? r\u1ed3i t\u00ednh t\u1ed5ng <\/span> <br\/><br\/> <span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span><br\/> Ta c\u00f3: $27 = 3^3$ ; $42 = 2 . 3 .7$ ; $84 = 2^2 . 3 . 7$ <br\/> $\\Rightarrow$ BCNN(27; 42; 84) = $2^2 . 3^3 . 7 = 756$ <br\/> $36 = 2^2 . 3^2$ ; $49 = 7^2$ ; $86 = 2 . 43$ <br\/> $\\Rightarrow$ BCNN(36; 49; 86) = $2^2 . 3^2 . 7^2 . 43 = 75852$ <br\/>BCNN(27; 42; 84) + BCNN(36; 49; 86) = 756 + 75852 = 76608 <br\/> <span class='basic_pink'> V\u1eady s\u1ed1 c\u1ea7n \u0111i\u1ec1n l\u00e0: 76608 <\/span> "}]}],"id_ques":786},{"time":24,"part":[{"title":"\u0110i\u1ec1n s\u1ed1 th\u00edch h\u1ee3p v\u00e0o ch\u1ed7 tr\u1ed1ng","title_trans":"","temp":"fill_the_blank","correct":[[["50715"]]],"list":[{"point":5,"width":80,"content":"","type_input":"","ques":"<center><img src='https://www.luyenthi123.com/file/luyenthi123/lop6/toan/daiso/bai16/lv2/img\/13.jpg' \/><\/center> <br\/> $BCNN(35; 91; 525) + BCNN(38; 55; 21)$ = _input_ ","hint":"","explain":" <span class='basic_left'><span class='basic_green'>H\u01b0\u1edbng d\u1eabn:<\/span><br\/> T\u00ednh BCNN(35; 91; 525) = ?; BCNN(38; 55; 21) = ? r\u1ed3i t\u00ednh t\u1ed5ng <\/span> <br\/><br\/> <span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span><br\/> Ta c\u00f3: $35 = 5 . 7$ ; $91 = 7 . 13$ ; $525 = 3 . 5^2 . 7$ <br\/> $\\Rightarrow$ BCNN(35; 91; 525) = $3 . 5^2 . 7 . 13 = 6825$ <br\/> V\u00ec (38; 55) = 1; (38; 21) = 1; (55; 21) = 1 <br\/> $\\Rightarrow$ BCNN(38; 55; 21) = 38 . 55 . 21 = 43890 <br\/>BCNN(35; 91; 525) + BCNN(38; 55; 21) = 6825 + 43890 = 50715 <br\/> <span class='basic_pink'> V\u1eady s\u1ed1 c\u1ea7n \u0111i\u1ec1n l\u00e0: 50715 <\/span> "}]}],"id_ques":787},{"time":24,"part":[{"title":"\u0110i\u1ec1n s\u1ed1 th\u00edch h\u1ee3p v\u00e0o ch\u1ed7 tr\u1ed1ng","title_trans":"","temp":"fill_the_blank","correct":[[["205"]]],"list":[{"point":5,"width":80,"content":"","type_input":"","ques":"<center><img src='https://www.luyenthi123.com/file/luyenthi123/lop6/toan/daiso/bai16/lv2/img\/8.jpg' \/><\/center> <br\/> Hi\u1ec7u gi\u1eefa BCNN(40; 52) v\u00e0 BCNN(63; 35; 105) l\u00e0 m\u1ed9t s\u1ed1 t\u1ef1 nhi\u00ean. S\u1ed1 \u0111\u00f3 l\u00e0: _input_ ","hint":"","explain":" <span class='basic_left'><span class='basic_green'>H\u01b0\u1edbng d\u1eabn:<\/span><br\/> T\u00ednh BCNN(40; 52) = ?; BCNN(63; 35; 105) = ? r\u1ed3i t\u00ednh hi\u1ec7u <\/span> <br\/><br\/> <span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span><br\/> Ta c\u00f3: $40 = 2^3 . 5$ ; $52 = 2^2 . 13$ <br\/> $\\Rightarrow$ BCNN(40; 52) = $2^3 . 5 . 13 = 520$ <br\/> $63 = 3^2 . 7$ ; $35 = 5 . 7$ ; $105 = 3 . 5 . 7$ <br\/> $\\Rightarrow$ BCNN(63; 35; 105) = $3^2 . 5 . 7 = 315$ <br\/>Hi\u1ec7u gi\u1eefa BCNN(40; 52) v\u00e0 BCNN(63; 35; 105) l\u00e0: 520 - 315 = 205 <br\/> <span class='basic_pink'> V\u1eady s\u1ed1 c\u1ea7n \u0111i\u1ec1n l\u00e0: 205 <\/span> "}]}],"id_ques":788},{"time":24,"part":[{"title":"\u0110i\u1ec1n s\u1ed1 th\u00edch h\u1ee3p v\u00e0o ch\u1ed7 tr\u1ed1ng","title_trans":"","temp":"fill_the_blank","correct":[[["4620"]]],"list":[{"point":5,"width":80,"content":"","type_input":"","ques":"<center><img src='https://www.luyenthi123.com/file/luyenthi123/lop6/toan/daiso/bai16/lv2/img\/8.jpg' \/><\/center> <br\/> Th\u01b0\u01a1ng gi\u1eefa BCNN(840; 150; 990) v\u00e0 \u01afCLN(840; 150; 990) l\u00e0 m\u1ed9t s\u1ed1 t\u1ef1 nhi\u00ean. S\u1ed1 \u0111\u00f3 l\u00e0: _input_ ","hint":"","explain":" <span class='basic_left'><span class='basic_green'>H\u01b0\u1edbng d\u1eabn:<\/span><br\/> T\u00ednh BCNN(840; 150; 990) = ?; \u01afCLN(840; 150; 990 ) = ? r\u1ed3i t\u00ednh th\u01b0\u01a1ng <\/span> <br\/><br\/> <span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span><br\/> Ta c\u00f3: $840 = 2^3 . 3 . 5 . 7$ ; $150 = 2 . 3 . 5^2$ ; $990 = 2 . 3^2 . 5 . 11$ <br\/> $\\Rightarrow$ BCNN(840; 150; 990) = $2^3 . 3^2 . 5^2 . 7 . 11 = 138600$ <br\/> \u01afCLN(840; 150; 990) = $2 . 3 . 5 = 30$ <br\/>Th\u01b0\u01a1ng gi\u1eefa BCNN(840; 150; 990) v\u00e0 \u01afCLN(840; 150; 990) l\u00e0: 138600 : 30 = 4620 <br\/> <span class='basic_pink'> V\u1eady s\u1ed1 c\u1ea7n \u0111i\u1ec1n l\u00e0: 4620 <\/span> "}]}],"id_ques":789},{"time":24,"part":[{"title":"\u0110i\u1ec1n s\u1ed1 th\u00edch h\u1ee3p v\u00e0o ch\u1ed7 tr\u1ed1ng","title_trans":"","temp":"fill_the_blank","correct":[[["36"]]],"list":[{"point":5,"width":60,"content":"","type_input":"","ques":"M\u1ed9t b\u1ed9 ph\u1eadn c\u1ee7a m\u00e1y c\u00f3 hai b\u00e1nh r\u0103ng c\u01b0a kh\u1edbp v\u1edbi nhau, b\u00e1nh xe th\u1ee9 nh\u1ea5t c\u00f3 18 r\u0103ng c\u01b0a, b\u00e1nh xe th\u1ee9 hai c\u00f3 12 r\u0103ng c\u01b0a. Ng\u01b0\u1eddi ta \u0111\u00e1nh d\u1ea5u \"x\" v\u00e0o 2 r\u0103ng c\u01b0a \u0111ang kh\u1edbp v\u1edbi nhau. H\u1ecfi m\u1ed7i b\u00e1nh xe ph\u1ea3i qua \u00edt nh\u1ea5t bao nhi\u00eau r\u0103ng c\u01b0a \u0111\u1ec3 2 r\u0103ng c\u01b0a \u0111\u00e1nh d\u1ea5u \u1ea5y l\u1ea1i kh\u1edbp nhau \u1edf v\u1ecb tr\u00ed gi\u1ed1ng l\u1ea7n tr\u01b0\u1edbc. <br\/> \u0110\u00e1p s\u1ed1: _input_ r\u0103ng c\u01b0a ","hint":"S\u1ed1 r\u0103ng c\u01b0a b\u1eb1ng BCNN(18; 12)","explain":" <span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span><br\/> G\u1ecdi s\u1ed1 r\u0103ng c\u01b0a m\u00e0 m\u1ed7i b\u00e1nh xe ph\u1ea3i quay l\u00e0 x (r\u0103ng c\u01b0a) <br\/> V\u00ec b\u00e1nh xe th\u1ee9 nh\u1ea5t c\u00f3 18 r\u0103ng c\u01b0a, b\u00e1nh xe th\u1ee9 hai c\u00f3 12 r\u0103ng c\u01b0a. <br\/> N\u00ean s\u1ed1 r\u0103ng c\u01b0a m\u00e0 m\u1ed7i b\u00e1nh xe ph\u1ea3i quay \u0111\u1ec3 2 r\u0103ng c\u01b0a \u0111\u00e1nh d\u1ea5u kh\u1edbp nhau l\u00e0 BCNN(18; 12) <br\/> x = BCNN(18; 12) = 36 <br\/> V\u1eady m\u1ed7i b\u00e1nh xe ph\u1ea3i quay \u00edt nh\u1ea5t 36 r\u0103ng c\u01b0a th\u00ec hai r\u0103ng c\u01b0a \u0111\u00e1nh d\u1ea5u \u1ea5y l\u1ea1i kh\u1edbp nhau <br\/> <span class='basic_pink'> S\u1ed1 c\u1ea7n \u0111i\u1ec1n l\u00e0: 36 <\/span> "}]}],"id_ques":790}],"lesson":{"save":0,"level":2}}

Điểm của bạn.

Câu hỏi này theo dạng chọn đáp án đúng, sau khi đọc xong câu hỏi, bạn bấm vào một trong số các đáp án mà chương trình đưa ra bên dưới, sau đó bấm vào nút gửi để kiểm tra đáp án và sẵn sàng chuyển sang câu hỏi kế tiếp

Trả lời đúng trong khoảng thời gian quy định bạn sẽ được + số điểm như sau:
Trong khoảng 1 phút đầu tiên + 5 điểm
Trong khoảng 1 phút -> 2 phút + 4 điểm
Trong khoảng 2 phút -> 3 phút + 3 điểm
Trong khoảng 3 phút -> 4 phút + 2 điểm
Trong khoảng 4 phút -> 5 phút + 1 điểm

Quá 5 phút: không được cộng điểm

Tổng thời gian làm mỗi câu (không giới hạn)

Điểm của bạn.

Bấm vào đây nếu phát hiện có lỗi hoặc muốn gửi góp ý