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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":[[2]],"list":[{"point":5,"ques":" <center><img src='https://www.luyenthi123.com/file/luyenthi123/lop6/toan/daiso/bai15/lv1/img\/1.png' \/><\/center> <br\/> \u01af\u1edbc chung l\u1edbn nh\u1ea5t l\u00e0 m\u1ed9t s\u1ed1 b\u1ea5t k\u00ec trong t\u1eadp h\u1ee3p \u01b0\u1edbc chung. <b> \u0110\u00daNG <\/b> hay <b> SAI <\/b>?","select":["A. \u0110\u00daNG ","B. SAI "],"hint":"","explain":"<span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span> <br\/> \u01af\u1edbc chung l\u1edbn nh\u1ea5t l\u00e0 s\u1ed1 l\u1edbn nh\u1ea5t trong t\u1eadp h\u1ee3p c\u00e1c \u01b0\u1edbc chung <br\/> V\u1eady kh\u1eb3ng \u0111\u1ecbnh tr\u00ean l\u00e0 <b> SAI <\/b> ","column":2}]}],"id_ques":711},{"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/bai15/lv1/img\/1.png' \/><\/center> <br\/> \u01af\u1edbc chung l\u1edbn nh\u1ea5t l\u00e0 s\u1ed1 nh\u1ecf nh\u1ea5t trong c\u00e1c s\u1ed1 \u0111\u00e3 cho n\u1ebfu s\u1ed1 \u0111\u00f3 l\u00e0 \u01b0\u1edbc c\u1ee7a c\u00e1c s\u1ed1 c\u00f2n l\u1ea1i. <b> \u0110\u00daNG <\/b> hay <b> SAI <\/b>?","select":["A. \u0110\u00daNG ","B. SAI "],"hint":"","explain":"<span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span> <br\/> Ch\u1eb3ng h\u1ea1n cho 3 s\u1ed1 a, b, c <br\/> N\u1ebfu b $\\vdots$ a, c $\\vdots$ a (hay a l\u00e0 \u01b0\u1edbc c\u1ee7a b, a l\u00e0 \u01b0\u1edbc c\u1ee7a c) <br\/> Khi \u0111\u00f3 \u01afCLN(a, b, c) = a <br\/> V\u1eady kh\u1eb3ng \u0111\u1ecbnh tr\u00ean l\u00e0 <b> \u0110\u00daNG <\/b> ","column":2}]}],"id_ques":712},{"time":24,"part":[{"title":"","title_trans":"","temp":"multiple_choice","correct":[[3]],"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/bai15/lv1/img\/3.jpg' \/><\/center> ","select":["A. \u01afCLN(20, 30) = 5 ","B. \u01afCLN(20, 30) = 6 ","C. \u01afCLN(20, 30) = 10 ","D. \u01afCLN(20, 30) = 15 "],"hint":"","explain":"<span class='basic_left'><span class='basic_green'>H\u01b0\u1edbng d\u1eabn:<\/span><br\/> PH\u01af\u01a0NG PH\u00c1P T\u00ccM \u01afCLN c\u1ee7a 2 hay nhi\u1ec1u s\u1ed1 <br\/> <b> B\u01b0\u1edbc 1: <\/b> Ph\u00e2n t\u00edch m\u1ed7i s\u1ed1 ra th\u1eeba s\u1ed1 nguy\u00ean t\u1ed1 <br\/> <b> B\u01b0\u1edbc 2: <\/b> Ch\u1ecdn ra c\u00e1c th\u1eeba s\u1ed1 chung <br\/> <b> B\u01b0\u1edbc 3: <\/b> L\u1eadp t\u00edch c\u00e1c th\u1eeba s\u1ed1 \u0111\u00e3 ch\u1ecdn, m\u1ed7i th\u1eeba s\u1ed1 l\u1ea5y v\u1edbi s\u1ed1 m\u0169 nh\u1ecf nh\u1ea5t c\u1ee7a n\u00f3. <br\/> T\u00edch \u0111\u00f3 ch\u00ednh l\u00e0 \u01afCLN c\u1ea7n t\u00ecm <\/span> <br\/><br\/> <span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span> <br\/> Ta c\u00f3: <br\/> <b> B\u01b0\u1edbc 1: <\/b> Ph\u00e2n t\u00edch 20 v\u00e0 30 ra t\u00edch c\u00e1c th\u1eeba s\u1ed1 nguy\u00ean t\u1ed1 <br\/> $20 = 2^2 . 5$ ; $30 = 2 . 3 . 5$ <br\/> <b> B\u01b0\u1edbc 2: <\/b> Ch\u1ecdn ra th\u1eeba s\u1ed1 chung <br\/> Ta th\u1ea5y c\u00f3 2 v\u00e0 5 l\u00e0 th\u1eeba s\u1ed1 chung <br\/> <b> B\u01b0\u1edbc 3: <\/b> L\u1eadp t\u00edch c\u00e1c th\u1eeba s\u1ed1 \u0111\u00e3 ch\u1ecdn m\u1ed7i s\u1ed1 l\u1ea5y v\u1edbi s\u1ed1 m\u0169 nh\u1ecf nh\u1ea5t c\u1ee7a n\u00f3 <br\/> \u01afCLN(20, 30) = 2 . 5 = 10 <br\/> <span class='basic_pink'> V\u1eady \u01afCLN(20, 30) = 10 <\/span> ","column":2}]}],"id_ques":713},{"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/bai15/lv1/img\/3.jpg' \/><\/center> ","select":["A. \u01afCLN(150; 135) = 15 ","B. \u01afCLN(150; 135) = 30 ","C. \u01afCLN(150; 135) = 10 ","D. \u01afCLN(150; 135) = 135 "],"hint":"","explain":"<span class='basic_left'><span class='basic_green'>H\u01b0\u1edbng d\u1eabn:<\/span><br\/> PH\u01af\u01a0NG PH\u00c1P T\u00ccM \u01afCLN c\u1ee7a 2 hay nhi\u1ec1u s\u1ed1 <br\/> <b> B\u01b0\u1edbc 1: <\/b> Ph\u00e2n t\u00edch m\u1ed7i s\u1ed1 ra th\u1eeba s\u1ed1 nguy\u00ean t\u1ed1 <br\/> <b> B\u01b0\u1edbc 2: <\/b> Ch\u1ecdn ra c\u00e1c th\u1eeba s\u1ed1 chung <br\/> <b> B\u01b0\u1edbc 3: <\/b> L\u1eadp t\u00edch c\u00e1c th\u1eeba s\u1ed1 \u0111\u00e3 ch\u1ecdn, m\u1ed7i th\u1eeba s\u1ed1 l\u1ea5y v\u1edbi s\u1ed1 m\u0169 nh\u1ecf nh\u1ea5t c\u1ee7a n\u00f3. <br\/> T\u00edch \u0111\u00f3 ch\u00ednh l\u00e0 \u01afCLN c\u1ea7n t\u00ecm <\/span> <br\/><br\/> <span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span> <br\/> Ta c\u00f3: <br\/> <b> B\u01b0\u1edbc 1: <\/b> Ph\u00e2n t\u00edch 135 v\u00e0 150 ra t\u00edch c\u00e1c th\u1eeba s\u1ed1 nguy\u00ean t\u1ed1 <br\/> $135 = 3^3 . 5$ ; $150 = 2 . 3 . 5^2$ <br\/> <b> B\u01b0\u1edbc 2: <\/b> Ch\u1ecdn ra th\u1eeba s\u1ed1 chung <br\/> Ta th\u1ea5y c\u00f3 3 v\u00e0 5 l\u00e0 th\u1eeba s\u1ed1 chung <br\/> <b> B\u01b0\u1edbc 3: <\/b> L\u1eadp t\u00edch c\u00e1c th\u1eeba s\u1ed1 \u0111\u00e3 ch\u1ecdn m\u1ed7i th\u1eeba s\u1ed1 l\u1ea5y v\u1edbi s\u1ed1 m\u0169 nh\u1ecf nh\u1ea5t c\u1ee7a n\u00f3 <br\/> \u01afCLN(135, 150) = 3 . 5 = 15 <br\/> <span class='basic_pink'> V\u1eady \u01afCLN(135; 150) = 15 <\/span> ","column":2}]}],"id_ques":714},{"time":24,"part":[{"title":"","title_trans":"","temp":"multiple_choice","correct":[[3]],"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/bai15/lv1/img\/3.jpg' \/><\/center> ","select":["A. \u01afCLN(120; 180) = 30 ","B. \u01afCLN(120; 180) = 40 ","C. \u01afCLN(120; 180) = 60 ","D. \u01afCLN(120; 180) = 90 "],"hint":"","explain":"<span class='basic_left'><span class='basic_green'>H\u01b0\u1edbng d\u1eabn:<\/span><br\/> PH\u01af\u01a0NG PH\u00c1P T\u00ccM \u01afCLN c\u1ee7a 2 hay nhi\u1ec1u s\u1ed1 <br\/> <b> B\u01b0\u1edbc 1: <\/b> Ph\u00e2n t\u00edch m\u1ed7i s\u1ed1 ra th\u1eeba s\u1ed1 nguy\u00ean t\u1ed1 <br\/> <b> B\u01b0\u1edbc 2: <\/b> Ch\u1ecdn ra c\u00e1c th\u1eeba s\u1ed1 chung <br\/> <b> B\u01b0\u1edbc 3: <\/b> L\u1eadp t\u00edch c\u00e1c th\u1eeba s\u1ed1 \u0111\u00e3 ch\u1ecdn, m\u1ed7i th\u1eeba s\u1ed1 l\u1ea5y v\u1edbi s\u1ed1 m\u0169 nh\u1ecf nh\u1ea5t c\u1ee7a n\u00f3. <br\/> T\u00edch \u0111\u00f3 ch\u00ednh l\u00e0 \u01afCLN c\u1ea7n t\u00ecm <\/span> <br\/><br\/> <span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span> <br\/> Ta c\u00f3: <br\/> <b> B\u01b0\u1edbc 1: <\/b> Ph\u00e2n t\u00edch 180 v\u00e0 120 ra t\u00edch c\u00e1c th\u1eeba s\u1ed1 nguy\u00ean t\u1ed1 <br\/> $120 = 2^3 . 3 . 5$ ; $180 = 2^2 . 3^2 . 5$ <br\/> <b> B\u01b0\u1edbc 2: <\/b> Ch\u1ecdn ra th\u1eeba s\u1ed1 chung <br\/> Ta th\u1ea5y c\u00f3 2; 3 v\u00e0 5 l\u00e0 th\u1eeba s\u1ed1 chung <br\/> <b> B\u01b0\u1edbc 3: <\/b> L\u1eadp t\u00edch c\u00e1c th\u1eeba s\u1ed1 \u0111\u00e3 ch\u1ecdn m\u1ed7i th\u1eeba s\u1ed1 l\u1ea5y v\u1edbi s\u1ed1 m\u0169 nh\u1ecf nh\u1ea5t c\u1ee7a n\u00f3 <br\/> \u01afCLN(120; 180) = $2^2 . 3 . 5 = 60$ <br\/> <span class='basic_pink'> V\u1eady \u01afCLN(120; 180) = 60 <\/span> ","column":2}]}],"id_ques":715},{"time":24,"part":[{"title":"","title_trans":"","temp":"multiple_choice","correct":[[3]],"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/bai15/lv1/img\/9.jpg' \/><\/center> ","select":["A. 40 = \u01afCLN(120; 40) ","B. 50 = \u01afCLN(100; 150) ","C. C\u1ea3 A v\u00e0 B \u0111\u1ec1u \u0111\u00fang"],"hint":"","explain":"<span class='basic_left'><span class='basic_green'>H\u01b0\u1edbng d\u1eabn:<\/span><br\/> X\u00e9t t\u1eebng \u0111\u00e1p \u00e1n <br\/> <b> B\u01b0\u1edbc 1: <\/b> <br\/> T\u00ecm \u01afCLN(120; 40) = ?; \u01afCLN(100; 150) = ? <br\/> <b> B\u01b0\u1edbc 2: <\/b> Ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang <br\/> <\/span> <br\/><br\/> <span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span> <br\/> Ta c\u00f3: <br\/> A -V\u00ec 120 $\\vdots$ 40 $\\Rightarrow$ \u01afCLN(120; 40) = 40 <br\/> $\\Rightarrow$ Kh\u1eb3ng \u0111\u1ecbnh \"$20 = \u01afCLN(120; 40) $\" l\u00e0 <b> \u0110\u00daNG <\/b> <br\/>B - V\u00ec 100 = $2^2 . 5^2$; 150 = $2 . 3 . 5^2$ <br\/> $\\Rightarrow$ \u01afCLN(100; 150) = $2 . 5^2$ = 50 <br\/> $\\Rightarrow$ Kh\u1eb3ng \u0111\u1ecbnh \" $50 = \u01afCLN(100; 150)$ \" l\u00e0 <b> \u0110\u00daNG <\/b> <br\/> C - V\u00ec c\u1ea3 A v\u00e0 B \u0111\u1ec1u \u0111\u00fang n\u00ean \u0111\u00e1p \u00e1n C \u0111\u00fang<br\/> <span class='basic_pink'> \u0110\u00e1p \u00e1n c\u1ea7n ch\u1ecdn l\u00e0: C <\/span> ","column":3}]}],"id_ques":716},{"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/bai15/lv1/img\/9.jpg' \/><\/center> ","select":["A. 11 = \u01afCLN(11; 121) ","B. 9 = \u01afCLN(18; 54) ","C. 16 = \u01afCLN(24; 80)"],"hint":"","explain":"<span class='basic_left'><span class='basic_green'>H\u01b0\u1edbng d\u1eabn:<\/span><br\/> X\u00e9t t\u1eebng \u0111\u00e1p \u00e1n <br\/> <b> B\u01b0\u1edbc 1: <\/b> <br\/> T\u00ecm \u01afCLN(11; 121) = ?; \u01afCLN(18; 54) = ?; \u01afCLN(24; 80) = ? <br\/> <b> B\u01b0\u1edbc 2: <\/b> Ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang <br\/> <\/span> <br\/><br\/> <span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span> <br\/> Ta c\u00f3: <br\/>A - V\u00ec 121 $\\vdots$ 11 $\\Rightarrow$ \u01afCLN(11; 121) = 11 <br\/> $\\Rightarrow$ Kh\u1eb3ng \u0111\u1ecbnh \"$11 = \u01afCLN(11; 121) $\" l\u00e0 <b> \u0110\u00daNG <\/b> <br\/> B - V\u00ec 54 $\\vdots$ 18 $\\Rightarrow$ \u01afCLN(18; 54) = 18 <br\/> $\\Rightarrow$ Kh\u1eb3ng \u0111\u1ecbnh \" $9 = \u01afCLN(18; 54)$ \" l\u00e0 <b> SAI <\/b> <br\/> D - V\u00ec $24 = 2^3 . 3$; $80 = 2^4 . 5$ <br\/> $\\Rightarrow$ \u01afCLN(24; 80) = $2^3$ = 8 <br\/> $\\Rightarrow$ Kh\u1eb3ng \u0111\u1ecbnh \" $16 = \u01afCLN(24; 80)$ \" l\u00e0 <b> SAI <\/b> <br\/> <span class='basic_pink'> V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0: A <\/span> ","column":3}]}],"id_ques":717},{"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/bai15/lv1/img\/12.jpg' \/><\/center> <br\/> T\u00ecm s\u1ed1 t\u1ef1 nhi\u00ean a l\u1edbn nh\u1ea5t bi\u1ebft 130 $\\vdots$ a v\u00e0 115 $\\vdots$ a. V\u1eady: ","select":["A. a = 10","B. a = 5","C. a = 15","D. a = 17"],"hint":"a = \u01afCLN(130; 115)","explain":"<span class='basic_left'><span class='basic_green'>H\u01b0\u1edbng d\u1eabn:<\/span><br\/> <b> B\u01b0\u1edbc 1: <\/b> V\u00ec 130 $\\vdots$ a v\u00e0 115 $\\vdots$ a <br\/> $\\Rightarrow$ a $\\in$ \u01afC(130; 115) <br\/> <b> B\u01b0\u1edbc 2: <\/b> T\u00ecm a = \u01afCLN(130; 115) <\/span> <br\/><br\/> <span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span> <br\/> Ta c\u00f3: <br\/> V\u00ec 130 $\\vdots$ a v\u00e0 115 $\\vdots$ a <br\/> $\\Rightarrow$ a $\\in$ \u01afC(130; 115) <br\/> V\u00ec a l\u00e0 l\u1edbn nh\u1ea5t n\u00ean a = \u01afCLN(130; 115) <br\/> Ta c\u00f3: $130 = 2 . 5 . 13$ ; $115 = 5 . 23$ <br\/> $\\Rightarrow$ \u01afCLN(130; 115) = 5 <br\/> V\u1eady s\u1ed1 t\u1ef1 nhi\u00ean l\u1edbn nh\u1ea5t m\u00e0 130 v\u00e0 115 c\u00f9ng chia h\u1ebft l\u00e0 5 <br\/> <span class='basic_pink'> \u0110\u00e1p \u00e1n \u0111\u00fang l\u00e0: B. a = 5 <\/span> ","column":4}]}],"id_ques":718},{"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/bai15/lv1/img\/12.jpg' \/><\/center> <br\/> T\u00ecm s\u1ed1 t\u1ef1 nhi\u00ean a l\u1edbn nh\u1ea5t bi\u1ebft 225 $\\vdots$ a v\u00e0 160 $\\vdots$ a. V\u1eady: ","select":["A. a = 6","B. a = 75","C. a = 15","D. a = 5"],"hint":"a = \u01afCLN(225; 160)","explain":"<span class='basic_left'><span class='basic_green'>H\u01b0\u1edbng d\u1eabn:<\/span><br\/> <b> B\u01b0\u1edbc 1: <\/b> V\u00ec 225 $\\vdots$ a v\u00e0 160 $\\vdots$ a <br\/> $\\Rightarrow$ a $\\in$ \u01afC(225; 160) <br\/> <b> B\u01b0\u1edbc 2: <\/b> T\u00ecm a = \u01afCLN(225; 160) <\/span> <br\/><br\/> <span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span> <br\/> Ta c\u00f3: <br\/> V\u00ec 225 $\\vdots$ a v\u00e0 160 $\\vdots$ a <br\/> $\\Rightarrow$ a $\\in$ \u01afC(225; 160) <br\/> V\u00ec a l\u00e0 l\u1edbn nh\u1ea5t n\u00ean a = \u01afCLN(225; 160) <br\/> Ta c\u00f3: $225 = 3^2 . 5^2$ ; $160 = 2^5 . 5$ <br\/> $\\Rightarrow$ \u01afCLN(225; 160) = 5 <br\/> V\u1eady s\u1ed1 t\u1ef1 nhi\u00ean l\u1edbn nh\u1ea5t m\u00e0 225 v\u00e0 160 c\u00f9ng chia h\u1ebft l\u00e0 5 <br\/> <span class='basic_pink'> \u0110\u00e1p \u00e1n \u0111\u00fang l\u00e0: D. a = 5 <\/span> ","column":4}]}],"id_ques":719},{"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/bai15/lv1/img\/4.jpg' \/><\/center> <br\/> H\u00e3y ch\u1ecdn c\u1eb7p s\u1ed1 nguy\u00ean t\u1ed1 c\u00f9ng nhau.","select":["A. 35 v\u00e0 18","B. 14 v\u00e0 36","C. 25 v\u00e0 35","D. 21 v\u00e0 15"],"hint":"C\u1ea7n t\u00ecm c\u1eb7p s\u1ed1 ch\u1ec9 c\u00f3 \u01b0\u1edbc chung l\u00e0 1","explain":"<span class='basic_left'><span class='basic_green'>H\u01b0\u1edbng d\u1eabn:<\/span><br\/> X\u00e9t t\u1eebng \u0111\u00e1p \u00e1n <br\/> T\u00ecm \u01b0\u1edbc chung c\u1ee7a c\u00e1c c\u1eb7p s\u1ed1 tr\u00ean <br\/> C\u1eb7p s\u1ed1 n\u00e0o ch\u1ec9 c\u00f3 \u01b0\u1edbc chung l\u00e0 1 th\u00ec \u0111\u00f3 l\u00e0 \u0111\u00e1p \u00e1n \u0111\u00fang <\/span> <br\/><br\/> <span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span> <br\/> Ta c\u00f3: <br\/> A - V\u00ec 35 = 5 . 7; 18 = $2. 3^2$ <br\/> $\\Rightarrow$ \u01afCLN(35; 18) = 1 <br\/> $\\Rightarrow$ 35 v\u00e0 18 nguy\u00ean t\u1ed1 c\u00f9ng nhau <b> (th\u1ecfa m\u00e3n) <\/b> <br\/> B - V\u00ec c\u1ea3 14 v\u00e0 28 \u0111\u1ec1u c\u00f3 \u01b0\u1edbc kh\u00e1c 1 l\u00e0 2 <br\/> $\\Rightarrow$ 14 v\u00e0 36 kh\u00f4ng nguy\u00ean t\u1ed1 c\u00f9ng nhau <b> (lo\u1ea1i) <\/b> <br\/>C - V\u00ec 25 v\u00e0 35 c\u00f3 \u01b0\u1edbc chung kh\u00e1c 1 l\u00e0 5 <br\/> $\\Rightarrow$ 25 v\u00e0 35 kh\u00f4ng nguy\u00ean t\u1ed1 c\u00f9ng nhau <b> (lo\u1ea1i) <\/b> <br\/> D - V\u00ec 21 v\u00e0 15 \u0111\u1ec1u c\u00f3 \u01b0\u1edbc chung kh\u00e1c 1 l\u00e0 3 <br\/> $\\Rightarrow$ 21 v\u00e0 15 kh\u00f4ng nguy\u00ean t\u1ed1 c\u00f9ng nhau <b> (lo\u1ea1i) <\/b> <br\/> <span class='basic_pink'> V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0: A. 35 v\u00e0 18 <\/span> ","column":2}]}],"id_ques":720},{"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/bai15/lv1/img\/4.jpg' \/><\/center> <br\/> H\u00e3y ch\u1ecdn c\u1eb7p s\u1ed1 kh\u00f4ng nguy\u00ean t\u1ed1 c\u00f9ng nhau.","select":["A. 135 v\u00e0 16","B. 111 v\u00e0 37","C. 21 v\u00e0 40","D. 36 v\u00e0 25"],"hint":"C\u1ea7n t\u00ecm c\u1eb7p s\u1ed1 c\u00f3 \u01b0\u1edbc chung kh\u00e1c 1","explain":"<span class='basic_left'><span class='basic_green'>H\u01b0\u1edbng d\u1eabn:<\/span><br\/> X\u00e9t t\u1eebng \u0111\u00e1p \u00e1n <br\/> T\u00ecm \u01b0\u1edbc chung c\u1ee7a c\u00e1c c\u1eb7p s\u1ed1 tr\u00ean <br\/> C\u1eb7p s\u1ed1 n\u00e0o c\u00f3 \u01b0\u1edbc chung kh\u00e1c 1 th\u00ec \u0111\u00f3 l\u00e0 \u0111\u00e1p \u00e1n \u0111\u00fang <\/span> <br\/><br\/> <span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span> <br\/> Ta c\u00f3: <br\/> A - V\u00ec $135 = 3^3 . 5$; $16 = 2^4$ <br\/> $\\Rightarrow$ \u01afCLN(135; 16) = 1 <br\/> $\\Rightarrow$ 135 v\u00e0 16 nguy\u00ean t\u1ed1 c\u00f9ng nhau <b> (lo\u1ea1i) <\/b> <br\/> B - V\u00ec 111 $\\vdots$ 37 $\\Rightarrow$ 111 v\u00e0 37 c\u00f3 \u01b0\u1edbc chung kh\u00e1c 1 l\u00e0 37 <br\/> $\\Rightarrow$ 111 v\u00e0 37 kh\u00f4ng nguy\u00ean t\u1ed1 c\u00f9ng nhau <b> (th\u1ecfa m\u00e3n) <\/b> <br\/>C - V\u00ec $21 = 3 . 7$; $40 = 2^3 . 5$ $\\Rightarrow$ \u01afCLN(21; 40) = 1<br\/> $\\Rightarrow$ 21 v\u00e0 40 nguy\u00ean t\u1ed1 c\u00f9ng nhau <b> (lo\u1ea1i) <\/b> <br\/> D - V\u00ec $36 = 2^2 . 3^2$; $25 = 5^2$ $\\Rightarrow$ \u01afCLN(36; 25) = 1 <br\/> $\\Rightarrow$ 36 v\u00e0 25 nguy\u00ean t\u1ed1 c\u00f9ng nhau <b> (lo\u1ea1i) <\/b> <br\/> <span class='basic_pink'> V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0: B. 111 v\u00e0 37 <\/span> ","column":2}]}],"id_ques":721},{"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/bai15/lv1/img\/13.jpg' \/><\/center> <br\/> \u01afCLN(36; 27; 125) = 1. <b> \u0110\u00daNG <\/b> hay <b> SAI <\/b>?","select":["A. \u0110\u00daNG","B. SAI"],"hint":"Ph\u00e2n t\u00edch c\u00e1c s\u1ed1 tr\u00ean ra th\u1eeba s\u1ed1 nguy\u00ean t\u1ed1 r\u1ed3i l\u1eadp t\u00edch c\u00e1c th\u1eeba s\u1ed1 nguy\u00ean t\u1ed1 chung, m\u1ed7i th\u1eeba s\u1ed1 l\u1ea5y v\u1edbi s\u1ed1 m\u0169 nh\u1ecf nh\u1ea5t","explain":"<span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span> <br\/> Ta c\u00f3: <br\/> $36 = 2^2 . 3^2$ <br\/> $27 = 3^3$ <br\/> $ 125 = 5^3$ <br\/> $\\Rightarrow$ \u01afCLN(36; 27; 125) = 1 <br\/> $\\Rightarrow$ Kh\u1eb3ng \u0111\u1ecbnh \"\u01afCLN(36; 27; 125) = 1 \" l\u00e0 <b> \u0110\u00daNG <\/b> ","column":2}]}],"id_ques":722},{"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/bai15/lv1/img\/13.jpg' \/><\/center> <br\/> \u01afCLN(120; 46; 220) = 20. <b> \u0110\u00daNG <\/b> hay <b> SAI <\/b>?","select":["A. \u0110\u00daNG","B. SAI"],"hint":"Ph\u00e2n t\u00edch c\u00e1c s\u1ed1 tr\u00ean ra th\u1eeba s\u1ed1 nguy\u00ean t\u1ed1 r\u1ed3i l\u1eadp t\u00edch c\u00e1c th\u1eeba s\u1ed1 nguy\u00ean t\u1ed1 chung, m\u1ed7i th\u1eeba s\u1ed1 l\u1ea5y v\u1edbi s\u1ed1 m\u0169 nh\u1ecf nh\u1ea5t","explain":"<span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span> <br\/> Ta c\u00f3: <br\/> $120 = 2^3 . 3 . 5$ <br\/> $46 = 2 . 23$ <br\/> $ 220 = 2^2 . 5 . 11$ <br\/> $\\Rightarrow$ \u01afCLN(120; 46; 220) = 2 <br\/> $\\Rightarrow$ Kh\u1eb3ng \u0111\u1ecbnh \"\u01afCLN(120; 46; 220) = 20 \" l\u00e0 <b> SAI <\/b> ","column":2}]}],"id_ques":723},{"time":24,"part":[{"title":"","title_trans":"","temp":"multiple_choice","correct":[[2]],"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/bai15/lv1/img\/8.jpg' \/><\/center> ","select":["A. \u01afC(120; 150) = {1; 2; 3; 4; 5; 30}","B. \u01afC(120; 150) = {1; 2; 3; 5; 6; 10; 15; 30}"],"hint":"Ta c\u00f3 th\u1ec3 t\u00ecm \u01afCLN(120; 150) r\u1ed3i t\u00ecm c\u00e1c \u01b0\u1edbc c\u1ee7a \u01afCLN v\u1eeba t\u00ecm","explain":"<span class='basic_left'><span class='basic_green'>H\u01b0\u1edbng d\u1eabn:<\/span><br\/> <b> C\u00e1ch 1: <\/b> T\u00ecm t\u1eadp h\u1ee3p c\u00e1c \u01af(120) r\u1ed3i t\u00ecm t\u1eadp \u01af(150) <br\/> T\u00ecm \u01afC(120; 150) b\u1eb1ng c\u00e1ch l\u1ea5y c\u00e1c ph\u1ea7n t\u1eed gi\u1ed1ng nhau \u1edf hai t\u1eadp h\u1ee3p tr\u00ean <br\/> <b> C\u00e1ch 2: <\/b> T\u00ecm \u01afCLN(120; 150) sau \u0111\u00f3 t\u00ecm t\u1eadp h\u1ee3p c\u00e1c \u01b0\u1edbc c\u1ee7a \u01afCLN v\u1eeba t\u00ecm <br\/> T\u1eadp h\u1ee3p \u0111\u00f3 ch\u00ednh l\u00e0 t\u1eadp h\u1ee3p c\u00e1c \u01afC(120; 150) <\/span> <br\/><br\/> <span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span> <br\/> Ta c\u00f3: <br\/> $120 = 2^3 . 3 . 5$ <br\/> $150 = 2 . 3 . 5^2$ <br\/> \u01afCLN(120; 150) = 2 . 3 . 5 = 30 <br\/> \u01af(30) = {1; 2; 3; 5; 6; 10; 15; 30} <br\/> $\\Rightarrow$ \u01afC(120; 150) = {1; 2; 3; 5; 6; 10; 15; 30} <br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0: B<\/span> <br\/> <span class='basic_left'><span class='basic_green'> <i> Nh\u1eadn x\u00e9t: V\u1edbi b\u00e0i t\u00ecm t\u1eadp h\u1ee3p \u01b0\u1edbc chung c\u1ee7a 2 hay nhi\u1ec1u s\u1ed1 ta c\u00f3 th\u1ec3 s\u1eed d\u1ee5ng c\u00e1ch t\u00ecm \u01afCLN c\u1ee7a c\u00e1c s\u1ed1 \u0111\u00f3, sau \u0111\u00f3 t\u00ecm t\u1eadp h\u1ee3p c\u00e1c \u01b0\u1edbc c\u1ee7a \u01afCLN v\u1eeba t\u00ecm, t\u1eadp h\u1ee3p \u0111\u00f3 ch\u00ednh l\u00e0 t\u1eadp h\u1ee3p \u01afC c\u1ee7a c\u00e1c s\u1ed1 \u0111\u00e3 cho. <\/i><\/span> ","column":2}]}],"id_ques":724},{"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/bai15/lv1/img\/8.jpg' \/><\/center> ","select":["A. \u01afC(180; 80) = {1; 2; 4; 5; 10; 20}","B. \u01afC(180; 80) = {1; 2; 6; 8; 10; 20}"],"hint":"Ta c\u00f3 th\u1ec3 t\u00ecm \u01afCLN(180; 80) r\u1ed3i t\u00ecm c\u00e1c \u01b0\u1edbc c\u1ee7a \u01afCLN v\u1eeba t\u00ecm","explain":"<span class='basic_left'><span class='basic_green'>H\u01b0\u1edbng d\u1eabn:<\/span><br\/> <b> C\u00e1ch 1: <\/b> T\u00ecm t\u1eadp h\u1ee3p c\u00e1c \u01af(180) r\u1ed3i t\u00ecm t\u1eadp \u01af(80) <br\/> T\u00ecm \u01afC(180; 80) b\u1eb1ng c\u00e1ch l\u1ea5y c\u00e1c ph\u1ea7n t\u1eed gi\u1ed1ng nhau \u1edf hai t\u1eadp h\u1ee3p tr\u00ean <br\/> <b> C\u00e1ch 2: <\/b> T\u00ecm \u01afCLN(180; 80) sau \u0111\u00f3 t\u00ecm t\u1eadp h\u1ee3p c\u00e1c \u01b0\u1edbc c\u1ee7a \u01afCLN v\u1eeba t\u00ecm <br\/> T\u1eadp h\u1ee3p \u0111\u00f3 ch\u00ednh l\u00e0 t\u1eadp h\u1ee3p c\u00e1c \u01afC(180; 80) <\/span> <br\/><br\/> <span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span> <br\/> Ta c\u00f3: <br\/> $180 = 2^2 . 3^2 . 5$ <br\/> $80 = 2^5 . 5$ <br\/> \u01afCLN(180; 80) = $2^2 . 5$ = 20 <br\/> \u01af(20) = {1; 2; 4; 5; 10; 20} <br\/> $\\Rightarrow$ \u01afC(180; 80) = {1; 2; 4; 5; 10; 20} <br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0: A<\/span> <br\/> <span class='basic_left'><span class='basic_green'> <i> Nh\u1eadn x\u00e9t: V\u1edbi b\u00e0i t\u00ecm t\u1eadp h\u1ee3p \u01b0\u1edbc chung c\u1ee7a 2 hay nhi\u1ec1u s\u1ed1 ta c\u00f3 th\u1ec3 s\u1eed d\u1ee5ng c\u00e1ch t\u00ecm \u01afCLN c\u1ee7a c\u00e1c s\u1ed1 \u0111\u00f3, sau \u0111\u00f3 t\u00ecm t\u1eadp h\u1ee3p c\u00e1c \u01b0\u1edbc c\u1ee7a \u01afCLN v\u1eeba t\u00ecm, t\u1eadp h\u1ee3p \u0111\u00f3 ch\u00ednh l\u00e0 t\u1eadp h\u1ee3p \u01afC c\u1ee7a c\u00e1c s\u1ed1 \u0111\u00e3 cho. <\/i><\/span> ","column":2}]}],"id_ques":725},{"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/bai15/lv1/img\/10.jpg' \/><\/center> <br\/> Cho $a = 2^2 . 3 . 5^2$ <br\/> $b = 2^3 . 3 . 7$ <br\/> V\u1eady \u01afCLN(a, b) = ? ","select":["A. \u01afCLN(a, b) = $2^3 . 3 . 5 . 7$","B. \u01afCLN(a, b) = $2^2 . 3 . 5^2 . 7$","C. \u01afCLN(a, b) = $2^2 . 3$","D. \u01afCLN(a, b) = $5^2 . 7$"],"hint":"","explain":"<span class='basic_left'><span class='basic_green'>H\u01b0\u1edbng d\u1eabn:<\/span><br\/> T\u00ecm \u01afCLN(a, b) b\u1eb1ng c\u00e1ch l\u1eadp t\u00edch c\u00e1c th\u1eeba s\u1ed1 chung, m\u1ed7i th\u1eeba s\u1ed1 l\u1ea5y v\u1edbi s\u1ed1 m\u0169 nh\u1ecf nh\u1ea5t <br\/> Sau \u0111\u00f3 ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang <\/span> <br\/><br\/> <span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span> <br\/> Ta c\u00f3: <br\/> V\u00ec $a = 2^2 . 3 . 5^2$ <br\/> $b = 2^3 . 3 . 7$ <br\/> $\\Rightarrow$ \u01afCLN(a, b) = $2^2 . 3$ <br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0: C<\/span> <br\/> ","column":2}]}],"id_ques":726},{"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/bai15/lv1/img\/10.jpg' \/><\/center> <br\/> Cho $a = 3^2 . 5 . 7$ <br\/> $b = 2^4 . 3 . 7$ <br\/> V\u1eady \u01afCLN(a, b) = ? ","select":["A. \u01afCLN(a, b) = $3 . 7$","B. \u01afCLN(a, b) = $3^2 . 7^2$","C. \u01afCLN(a, b) = $2^4 . 5$","D. \u01afCLN(a, b) = $2^4 . 3^2 . 5 . 7$"],"hint":"","explain":"<span class='basic_left'><span class='basic_green'>H\u01b0\u1edbng d\u1eabn:<\/span><br\/> T\u00ecm \u01afCLN(a, b) b\u1eb1ng c\u00e1ch l\u1eadp t\u00edch c\u00e1c th\u1eeba s\u1ed1 chung, m\u1ed7i th\u1eeba s\u1ed1 l\u1ea5y v\u1edbi s\u1ed1 m\u0169 nh\u1ecf nh\u1ea5t <br\/> Sau \u0111\u00f3 ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang <\/span> <br\/><br\/> <span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span> <br\/> Ta c\u00f3: <br\/> V\u00ec $a = 3^2 . 5 . 7$ <br\/> $b = 2^4 . 3 . 7$ <br\/> $\\Rightarrow$ \u01afCLN(a, b) = $3 . 7$ <br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0: A<\/span> <br\/> ","column":2}]}],"id_ques":727},{"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/bai15/lv1/img\/10.jpg' \/><\/center> <br\/> Cho $a = 5^2 . 7 . 11$ <br\/> $b = 2^3 . 3^2 . 11$ <br\/> V\u1eady \u01afCLN(a, b) = ? ","select":["A. \u01afCLN(a, b) = $2^3 . 3^2 . 5^2 . 7$","B. \u01afCLN(a, b) = $11$","C. \u01afCLN(a, b) = $3^2 . 5^2$","D. \u01afCLN(a, b) = $2^3 . 7 . 11$"],"hint":"","explain":"<span class='basic_left'><span class='basic_green'>H\u01b0\u1edbng d\u1eabn:<\/span><br\/> T\u00ecm \u01afCLN(a, b) b\u1eb1ng c\u00e1ch l\u1eadp t\u00edch c\u00e1c th\u1eeba s\u1ed1 chung, m\u1ed7i th\u1eeba s\u1ed1 l\u1ea5y v\u1edbi s\u1ed1 m\u0169 nh\u1ecf nh\u1ea5t <br\/> Sau \u0111\u00f3 ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang <\/span> <br\/><br\/> <span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span> <br\/> Ta c\u00f3: <br\/> V\u00ec $a = 5^2 . 7 . 11$ <br\/> $b = 2^3 . 3^2 . 11$ <br\/> $\\Rightarrow$ \u01afCLN(a, b) = $11$ <br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0: B<\/span> <br\/> ","column":2}]}],"id_ques":728},{"time":24,"part":[{"title":"\u0110i\u1ec1n t\u1eeb th\u00edch h\u1ee3p v\u00e0o ch\u1ed7 tr\u1ed1ng","title_trans":"","temp":"fill_the_blank_random","correct":[[["2"]]],"list":[{"point":5,"width":60,"content":"","type_input":"","ques":"<center><img src='https://www.luyenthi123.com/file/luyenthi123/lop6/toan/daiso/bai15/lv1/img\/7.jpg' \/><\/center> <br\/>T\u00ecm s\u1ed1 t\u1ef1 nhi\u00ean x l\u1edbn nh\u1ea5t bi\u1ebft 18 $\\vdots$ x v\u00e0 32 $\\vdots$ x. <br\/> V\u1eady x = _input_ ","hint":"","explain":" <span class='basic_left'><span class='basic_green'>H\u01b0\u1edbng d\u1eabn:<\/span><br\/>V\u00ec x l\u1edbn nh\u1ea5t v\u00e0 18 $\\vdots$ x; 32 $\\vdots$ x <br\/> N\u00ean x c\u1ea7n t\u00ecm ch\u00ednh l\u00e0 \u01afCLN(32; 18) <br\/> B\u00e0i to\u00e1n quy v\u1ec1 b\u00e0i to\u00e1n t\u00ecm \u01afCLN <\/span> <br\/><br\/> <span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span><br\/> Ta c\u00f3: <br\/> V\u00ec 18 $\\vdots$ x $\\Rightarrow$ x $\\in$ \u01af(18) (1) <br\/> 32 $\\vdots$ x $\\Rightarrow$ x $\\in$ \u01af(32) (2) <br\/> T\u1eeb (1) v\u00e0 (2) $\\Rightarrow$ x $\\in$ \u01afC(18; 32) <br\/> v\u00e0 v\u00ec x l\u00e0 l\u1edbn nh\u1ea5t n\u00ean x = \u01afCLN(18; 32) <br\/> Ta c\u00f3: $18 = 2 . 3^2$; $32 = 2^5$ <br\/> $\\Rightarrow$ x = \u01afCLN(18; 32) = 2<br\/> <span class='basic_pink'> V\u1eady s\u1ed1 c\u1ea7n \u0111i\u1ec1n l\u00e0: 2 <\/span> "}]}],"id_ques":729},{"time":24,"part":[{"title":"\u0110i\u1ec1n t\u1eeb th\u00edch h\u1ee3p v\u00e0o ch\u1ed7 tr\u1ed1ng","title_trans":"","temp":"fill_the_blank_random","correct":[[["7"]]],"list":[{"point":5,"width":60,"content":"","type_input":"","ques":"<center><img src='https://www.luyenthi123.com/file/luyenthi123/lop6/toan/daiso/bai15/lv1/img\/7.jpg' \/><\/center> <br\/>T\u00ecm s\u1ed1 t\u1ef1 nhi\u00ean x l\u1edbn nh\u1ea5t bi\u1ebft 35 $\\vdots$ x v\u00e0 49 $\\vdots$ x. <br\/> V\u1eady x = _input_ ","hint":"","explain":" <span class='basic_left'><span class='basic_green'>H\u01b0\u1edbng d\u1eabn:<\/span><br\/>V\u00ec x l\u1edbn nh\u1ea5t v\u00e0 35 $\\vdots$ x; 49 $\\vdots$ x <br\/> N\u00ean x c\u1ea7n t\u00ecm ch\u00ednh l\u00e0 \u01afCLN(35; 49) <br\/> B\u00e0i to\u00e1n quy v\u1ec1 b\u00e0i to\u00e1n t\u00ecm \u01afCLN <\/span> <br\/><br\/> <span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span><br\/> Ta c\u00f3: <br\/> V\u00ec 35 $\\vdots$ x $\\Rightarrow$ x $\\in$ \u01af(35) (1) <br\/> 49 $\\vdots$ x $\\Rightarrow$ x $\\in$ \u01af(49) (2) <br\/> T\u1eeb (1) v\u00e0 (2) $\\Rightarrow$ x $\\in$ \u01afC(35; 49) <br\/> v\u00e0 v\u00ec x l\u00e0 l\u1edbn nh\u1ea5t n\u00ean x = \u01afCLN(35; 49) <br\/> Ta c\u00f3: $35 = 5 . 7$; $49 = 7^2$ <br\/> $\\Rightarrow$ x = \u01afCLN(35; 49) = 7<br\/> <span class='basic_pink'> V\u1eady s\u1ed1 c\u1ea7n \u0111i\u1ec1n l\u00e0: 7 <\/span> "}]}],"id_ques":730}],"lesson":{"save":0,"level":1}}

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