{"segment":[{"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":[[["1"],["7"],["9"]]],"list":[{"point":10,"width":60,"content":"","type_input":"","ques":"<center><img src='https://www.luyenthi123.com/file/luyenthi123/lop6/toan/daiso/bai13/lv3/img\/4.jpg' \/><\/center> <br\/> Thay c\u00e1c ch\u1eef s\u1ed1 th\u00edch h\u1ee3p v\u00e0o d\u1ea5u * \u0111\u1ec3 $\\overline{13*}$ l\u00e0 s\u1ed1 nguy\u00ean t\u1ed1<br\/> * = _input_ ; * = _input_ ho\u1eb7c * = _input_","hint":"","explain":" <span class='basic_left'><span class='basic_green'>H\u01b0\u1edbng d\u1eabn:<\/span><br\/> Thay c\u00e1c gi\u00e1 tr\u1ecb * = 1; 3; 7; 9 v\u00e0o $\\overline{13*}$ <br\/> Sau \u0111\u00f3 x\u00e9t xem s\u1ed1 \u0111\u00f3 c\u00f3 ph\u1ea3i s\u1ed1 nguy\u00ean t\u1ed1 kh\u00f4ng <\/span> <br\/><br\/> <span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span><br\/> Ta c\u00f3: <br\/> V\u00ec \u0111\u1ec3 $\\overline{13*}$ l\u00e0 s\u1ed1 nguy\u00ean t\u1ed1 th\u00ec * ch\u1ec9 c\u00f3 th\u1ec3 b\u1eb1ng 1; 3; 7 ho\u1eb7c 9 <br\/> Thay * = 1 v\u00e0o ta \u0111\u01b0\u1ee3c s\u1ed1 131 l\u00e0 s\u1ed1 nguy\u00ean t\u1ed1 <b> (th\u1ecfa m\u00e3n) <\/b> <br\/> Thay * = 3 v\u00e0o ta \u0111\u01b0\u1ee3c s\u1ed1 133 l\u00e0 h\u1ee3p s\u1ed1 <b> (lo\u1ea1i) <\/b><br\/> Thay * = 7 v\u00e0o ta \u0111\u01b0\u1ee3c s\u1ed1 137 l\u00e0 s\u1ed1 nguy\u00ean t\u1ed1 <b> (th\u1ecfa m\u00e3n) <\/b> <br\/> Thay * = 9 v\u00e0o ta \u0111\u01b0\u1ee3c s\u1ed1 139 l\u00e0 s\u1ed1 nguy\u00ean t\u1ed1 <b> (th\u1ecfa m\u00e3n) <\/b> <br\/> V\u1eady v\u1edbi * = 1; 7; 9 th\u00ec $\\overline{13*}$ l\u00e0 s\u1ed1 nguy\u00ean t\u1ed1 <br\/> <span class='basic_pink'> V\u1eady c\u00e1c s\u1ed1 c\u1ea7n \u0111i\u1ec1n l\u00e0: 1; 7; 9 <\/span>"}]}],"id_ques":651},{"time":24,"part":[{"title":"\u0110i\u1ec1n t\u1eeb th\u00edch h\u1ee3p v\u00e0o ch\u1ed7 tr\u1ed1ng","title_trans":"","temp":"fill_the_blank","correct":[[["7"]]],"list":[{"point":10,"width":60,"content":"","type_input":"","ques":"<center><img src='https://www.luyenthi123.com/file/luyenthi123/lop6/toan/daiso/bai13/lv3/img\/4.jpg' \/><\/center> <br\/> Thay c\u00e1c ch\u1eef s\u1ed1 th\u00edch h\u1ee3p v\u00e0o d\u1ea5u * \u0111\u1ec3 $\\overline{39*}$ l\u00e0 s\u1ed1 nguy\u00ean t\u1ed1<br\/> * = _input_ ","hint":"","explain":" <span class='basic_left'><span class='basic_green'>H\u01b0\u1edbng d\u1eabn:<\/span><br\/> Thay c\u00e1c gi\u00e1 tr\u1ecb * = 1; 3; 7; 9 v\u00e0o $\\overline{39*}$ <br\/> Sau \u0111\u00f3 x\u00e9t xem s\u1ed1 \u0111\u00f3 c\u00f3 ph\u1ea3i s\u1ed1 nguy\u00ean t\u1ed1 kh\u00f4ng <\/span> <br\/><br\/> <span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span><br\/> Ta c\u00f3: <br\/> V\u00ec \u0111\u1ec3 $\\overline{39*}$ l\u00e0 s\u1ed1 nguy\u00ean t\u1ed1 th\u00ec * ch\u1ec9 c\u00f3 th\u1ec3 b\u1eb1ng 1; 3; 7 ho\u1eb7c 9 <br\/> Thay * = 1 v\u00e0o ta \u0111\u01b0\u1ee3c s\u1ed1 391 l\u00e0 h\u1ee3p s\u1ed1 (v\u00ec 391 $\\vdots$ 17) <b> (lo\u1ea1i) <\/b> <br\/> Thay * = 3 v\u00e0o ta \u0111\u01b0\u1ee3c s\u1ed1 393 l\u00e0 h\u1ee3p s\u1ed1 (v\u00ec 393 $\\vdots$ 3) <b> (lo\u1ea1i) <\/b><br\/> Thay * = 7 v\u00e0o ta \u0111\u01b0\u1ee3c s\u1ed1 397 l\u00e0 s\u1ed1 nguy\u00ean t\u1ed1 <b> (th\u1ecfa m\u00e3n) <\/b> <br\/> Thay * = 9 v\u00e0o ta \u0111\u01b0\u1ee3c s\u1ed1 399 l\u00e0 h\u1ee3p s\u1ed1 (v\u00ec 399 $\\vdots$ 3) <b> (lo\u1ea1i) <\/b> <br\/> V\u1eady v\u1edbi * = 7 th\u00ec $\\overline{39*}$ l\u00e0 s\u1ed1 nguy\u00ean t\u1ed1 <br\/> <span class='basic_pink'> V\u1eady s\u1ed1 c\u1ea7n \u0111i\u1ec1n l\u00e0: 7 <\/span>"}]}],"id_ques":652},{"time":24,"part":[{"title":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","title_trans":"","temp":"multiple_choice","correct":[[1]],"list":[{"point":10,"ques":" <center><img src='https://www.luyenthi123.com/file/luyenthi123/lop6/toan/daiso/bai13/lv3/img\/7.jpg' \/><\/center> <br\/> Ph\u00e2n t\u00edch s\u1ed1 40 000 ra th\u1eeba s\u1ed1 nguy\u00ean t\u1ed1 ta \u0111\u01b0\u1ee3c bi\u1ec3u th\u1ee9c n\u00e0o sau \u0111\u00e2y?","select":["A. $2^6 . 5^4$ ","B. $2^4 . 5^6$ ","C. $2^2 . 3 . 5^4$","D. $2^3 . 3 . 5^3$"],"hint":"","explain":"<span class='basic_left'><span class='basic_green'>H\u01b0\u1edbng d\u1eabn:<\/span><br\/> Ph\u00e2n t\u00edch s\u1ed1 40 000 ra th\u1eeba s\u1ed1 nguy\u00ean t\u1ed1 r\u1ed3i ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang <\/span> <br\/><br\/> <span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span> <br\/>S\u1ed1 40 000 \u0111\u01b0\u1ee3c ph\u00e2n t\u00edch ra th\u1eeba s\u1ed1 nguy\u00ean t\u1ed1 l\u00e0: <br\/> $40 000 = 2^6 . 5^4$ <br\/> <span class='basic_pink'> V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0: A <\/span> ","column":2}]}],"id_ques":653},{"time":24,"part":[{"title":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","title_trans":"","temp":"multiple_choice","correct":[[2]],"list":[{"point":10,"ques":" <center><img src='https://www.luyenthi123.com/file/luyenthi123/lop6/toan/daiso/bai13/lv3/img\/7.jpg' \/><\/center> <br\/> Ph\u00e2n t\u00edch s\u1ed1 6840 ra th\u1eeba s\u1ed1 nguy\u00ean t\u1ed1 ta \u0111\u01b0\u1ee3c bi\u1ec3u th\u1ee9c n\u00e0o sau \u0111\u00e2y?","select":["A. $2^2 . 3^2 . 5^2 . 19$ ","B. $2^3 . 3^2 . 5 . 19$ ","C. $2 . 3^3 . 5^2 . 19$","D. $2 . 3^2 . 5 . 19$"],"hint":"","explain":"<span class='basic_left'><span class='basic_green'>H\u01b0\u1edbng d\u1eabn:<\/span><br\/> Ph\u00e2n t\u00edch s\u1ed1 6840 ra th\u1eeba s\u1ed1 nguy\u00ean t\u1ed1 r\u1ed3i ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang<\/span> <br\/><br\/> <span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span> <br\/> Ph\u00e2n t\u00edch s\u1ed1 6840 ra th\u1eeba s\u1ed1 nguy\u00ean t\u1ed1 ta \u0111\u01b0\u1ee3c: <br\/> $6840 = 2^3 . 3^2 . 5 . 19$ <br\/> <span class='basic_pink'> V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0: B <\/span> ","column":2}]}],"id_ques":654},{"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":[[["49"],["50"]]],"list":[{"point":10,"width":60,"content":"","type_input":"","ques":"<center><img src='https://www.luyenthi123.com/file/luyenthi123/lop6/toan/daiso/bai13/lv3/img\/11.jpg' \/><\/center> <br\/> T\u00ecm 2 s\u1ed1 t\u1ef1 nhi\u00ean li\u00ean ti\u1ebfp c\u00f3 t\u00edch b\u1eb1ng 2450 <br\/> Hai s\u1ed1 \u0111\u00f3 l\u00e0: * = _input_; _input_ ","hint":"Ph\u00e2n t\u00edch s\u1ed1 2450 ra t\u00edch c\u00e1c th\u1eeba s\u1ed1 nguy\u00ean t\u1ed1 r\u1ed3i nh\u00f3m c\u00e1c th\u1eeba s\u1ed1 th\u00edch h\u1ee3p \u0111\u1ec3 \u0111\u01b0\u1ee3c t\u00edch c\u1ee7a hai s\u1ed1 t\u1ef1 nhi\u00ean li\u00ean ti\u1ebfp","explain":" <span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span><br\/> Ta c\u00f3: <br\/> $\\begin{align*} 2450 & = 2 . 5 . 5 . 7 . 7 \\\\&= 2 . 5^2 . 7^2 \\\\ &= (2 . 5^2) . 7^2 \\\\ &= (2 . 25) . 49 \\\\ &= 50 . 49 \\end{align*} $ <br\/> V\u1eady 2450 = 49 . 50 <br\/> <span class='basic_pink'> C\u00e1c s\u1ed1 c\u1ea7n \u0111i\u1ec1n l\u00e0: 49; 50 <\/span>"}]}],"id_ques":655},{"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":[[["16"]]],"list":[{"point":10,"width":60,"content":"","type_input":"","ques":"<center><img src='https://www.luyenthi123.com/file/luyenthi123/lop6/toan/daiso/bai13/lv3/img\/9.jpg' \/><\/center> <br\/> S\u1ed1 1240 c\u00f3 t\u1ea5t c\u1ea3 bao nhi\u00eau \u01b0\u1edbc? <br\/> \u0110\u00e1p \u00e1n l\u00e0: _input_ \u01b0\u1edbc ","hint":"Ph\u00e2n t\u00edch s\u1ed1 1240 ra th\u1eeba s\u1ed1 nguy\u00ean t\u1ed1","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 s\u1ed1 1240 ra t\u00edch c\u00e1c th\u1eeba s\u1ed1 nguy\u00ean t\u1ed1 b\u1eb1ng c\u00e1ch chia 1240 cho cho c\u00e1c \u01b0\u1edbc nguy\u00ean t\u1ed1<br\/> <b> B\u01b0\u1edbc 2: <\/b> T\u00ednh s\u1ed1 \u01b0\u1edbc c\u1ee7a s\u1ed1 2140 theo c\u00f4ng th\u1ee9c <br\/> N\u1ebfu s\u1ed1 A \u0111\u01b0\u1ee3c ph\u00e2n t\u00edch ra t\u00edch c\u00e1c th\u1eeba s\u1ed1 nguy\u00ean t\u1ed1 A = $ a^x . b^y . c^z$ (a, b, c l\u00e0 s\u1ed1 nguy\u00ean t\u1ed1, $x, y , x \\in \\mathbb{N}$) <br\/> S\u1ed1 \u01b0\u1edbc c\u1ee7a A = (x + 1) . (y + 1) . (z + 1) <\/span> <br\/><br\/> <span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span><br\/> Ph\u00e2n t\u00edch s\u1ed1 1240 ra th\u1eeba s\u1ed1 nguy\u00ean t\u1ed1 ta \u0111\u01b0\u1ee3c: <br\/> $\\begin{align*} 1240 &= 2 . 2 . 2 . 5 . 31 \\\\ &= 2^3 . 5 . 31 \\end{align*} $ <br\/> S\u1ed1 1240 c\u00f3 s\u1ed1 \u01b0\u1edbc l\u00e0: <br\/> (3 + 1) . (1 + 1) . (1 + 1) = 16 (\u01b0\u1edbc) <br\/> <span class='basic_pink'> V\u1eady s\u1ed1 c\u1ea7n \u0111i\u1ec1n l\u00e0: 16 <\/span>"}]}],"id_ques":656},{"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":[[["30"]]],"list":[{"point":10,"width":60,"content":"","type_input":"","ques":"<center><img src='https://www.luyenthi123.com/file/luyenthi123/lop6/toan/daiso/bai13/lv3/img\/3.jpg' \/><\/center> <br\/> T\u00ecm s\u1ed1 t\u1ef1 nhi\u00ean n bi\u1ebft: <br\/> $1 + 2 + 3 + 4 + ... + n = 465$ <br\/> V\u1eady n = _input_ ","hint":"T\u00ednh t\u1ed5ng 1 + 2 + 3 + ... + n r\u1ed3i cho b\u1eb1ng 465 r\u1ed3i t\u00ecm n","explain":" <span class='basic_left'><span class='basic_green'>H\u01b0\u1edbng d\u1eabn:<\/span><br\/> <b> B\u01b0\u1edbc 1: <\/b> T\u00ednh t\u1ed5ng 1 + 2 + 3 + 4 + ... + n theo c\u00f4ng th\u1ee9c t\u00ednh t\u1ed5ng c\u1ee7a d\u00e3y c\u00e1ch \u0111\u1ec1u <br\/> T\u1ed5ng = s\u1ed1 s\u1ed1 h\u1ea1ng . (s\u1ed1 h\u1ea1ng \u0111\u1ea7u + s\u1ed1 h\u1ea1ng cu\u1ed1i) : 2<br\/> <b> B\u01b0\u1edbc 2: <\/b> Cho t\u1ed5ng v\u1eeba t\u00ednh \u1edf b\u01b0\u1edbc 1 b\u1eb1ng 465 r\u1ed3i bi\u1ebfn \u0111\u1ed5i \u0111\u1ec3 t\u00ecm n <\/span> <br\/><br\/> <span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span><br\/> Ta th\u1ea5y d\u00e3y 1 + 2 + 3 + 4 + ... + n l\u00e0 d\u00e3y c\u00e1ch \u0111\u1ec1u 1 \u0111\u01a1n v\u1ecb <br\/> N\u00ean d\u00e3y tr\u00ean c\u00f3 n s\u1ed1 h\u1ea1ng <br\/> T\u1ed5ng c\u1ee7a d\u00e3y l\u00e0: 1 + 2 + 3 + 4 + ... + n = n . (n + 1) : 2 (1) <br\/> M\u1eb7t kh\u00e1c theo \u0111\u1ec1 b\u00e0i ta c\u00f3: 1 + 2 + 3 + 4 + ... + n = 465 (2) <br\/> T\u1eeb (1) v\u00e0 (2) $\\Rightarrow$ n . (n + 1) : 2 = 465 <br\/> $\\begin{align*} n . (n + 1) : 2 &= 465 \\\\ n . (n + 1) &=465 . 2 \\\\ n . (n + 1) &= 930 \\end{align*} $ <br\/> Ph\u00e2n t\u00edch s\u1ed1 930 ra th\u1eeba s\u1ed1 nguy\u00ean t\u1ed1 ta \u0111\u01b0\u1ee3c: 930 = 2 . 3 . 5 . 31 <br\/> 930 = (2 . 3 . 5) . 31 = 30 . 31 <br\/> $\\Rightarrow$ n . (n + 1) = 30 . 31 <br\/>$\\Rightarrow$ n = 30 <br\/> <span class='basic_pink'> V\u1eady s\u1ed1 c\u1ea7n \u0111i\u1ec1n l\u00e0: 30 <\/span>"}]}],"id_ques":657},{"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":[[["12"]]],"list":[{"point":10,"width":60,"content":"","type_input":"","ques":"<center><img src='https://www.luyenthi123.com/file/luyenthi123/lop6/toan/daiso/bai13/lv3/img\/11.jpg' \/><\/center> <br\/> L\u1eadp ph\u01b0\u01a1ng c\u1ee7a m\u1ed9t s\u1ed1 b\u1eb1ng 1728. H\u1ecfi s\u1ed1 \u0111\u00f3 l\u00e0 s\u1ed1 n\u00e0o? <br\/> S\u1ed1 \u0111\u00f3 l\u00e0: _input_ ","hint":"Ph\u00e2n t\u00edch s\u1ed1 1728 ra th\u1eeba s\u1ed1 nguy\u00ean t\u1ed1","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 s\u1ed1 1728 ra th\u1eeba s\u1ed1 nguy\u00ean t\u1ed1 <br\/> <b> B\u01b0\u1edbc 2: <\/b> Nh\u00f3m c\u00e1c s\u1ed1 th\u1eeba s\u1ed1 l\u1ea1i \u0111\u1ec3 1728 b\u1eb1ng t\u00edch c\u1ee7a 3 th\u1eeba s\u1ed1 gi\u1ed1ng nhau <\/span> <br\/><br\/> <span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span><br\/> Ph\u00e2n t\u00edch s\u1ed1 1728 ra th\u1eeba s\u1ed1 nguy\u00ean t\u1ed1 ta \u0111\u01b0\u1ee3c: <br\/> $1728 = 2^6 . 3^3$ <br\/> $1728 = (2^2 . 3) . (2^2 . 3) . (2^2 . 3) = 12 . 12 . 12 = 12^3$ <br\/> V\u1eady l\u1eadp ph\u01b0\u01a1ng c\u1ee7a 12 b\u1eb1ng 1728 <br\/> <span class='basic_pink'> S\u1ed1 c\u1ea7n \u0111i\u1ec1n l\u00e0: 12 <\/span>"}]}],"id_ques":658},{"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":[[["144"]]],"list":[{"point":10,"width":60,"content":"","type_input":"","ques":"<center><img src='https://www.luyenthi123.com/file/luyenthi123/lop6/toan/daiso/bai13/lv3/img\/11.jpg' \/><\/center> <br\/> T\u00ecm s\u1ed1 t\u1ef1 nhi\u00ean nh\u1ecf nh\u1ea5t c\u00f3 15 \u01b0\u1edbc? <br\/> S\u1ed1 c\u1ea7n t\u00ecm l\u00e0: _input_ ","hint":"","explain":" <span class='basic_left'><span class='basic_green'>H\u01b0\u1edbng d\u1eabn:<\/span><br\/> <b> B\u01b0\u1edbc 1: <\/b> X\u00e1c \u0111\u1ecbnh d\u1ea1ng t\u1ed5ng qu\u00e1t c\u1ee7a s\u1ed1 A khi ph\u00e2n t\u00edch ra th\u1eeba s\u1ed1 nguy\u00ean t\u1ed1 <br\/>Tr\u01b0\u1eddng h\u1ee3p 15 b\u1eb1ng t\u00edch c\u1ee7a 2 s\u1ed1 th\u00ec s\u1ed1 A ph\u00e2n t\u00edch ra th\u1eeba s\u1ed1 nguy\u00ean t\u1ed1 l\u00e0 $a^x . b^y$ (1) <br\/> <b> B\u01b0\u1edbc 2: <\/b> T\u00ecm a, b, x, y <br\/> S\u1ed1 \u01b0\u1edbc c\u1ee7a A l\u00e0: (x + 1) . (y + 1) = 15 <br\/> T\u1eeb \u0111\u00f3 ta t\u00ecm \u0111\u01b0\u1ee3c x v\u00e0 y <br\/> <b> B\u01b0\u1edbc 3: <\/b> Thay a, b, x, y v\u00e0o (1) \u0111\u1ec3 t\u00ecm s\u1ed1 A (x\u00e9t c\u00e1c tr\u01b0\u1eddng h\u1ee3p) <\/span> <br\/><br\/> <span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span><br\/> G\u1ecdi s\u1ed1 c\u1ea7n t\u00ecm l\u00e0 A <br\/> Ta c\u00f3: 15 = 3 . 5 = 1 . 15 <br\/> $\\Rightarrow$ $A = a^x . b^y$ (a, b l\u00e0 c\u00e1c th\u1eeba s\u1ed1 nguy\u00ean t\u1ed1; x, y $\\in \\mathbb{N}$) <br\/> V\u00ec A nh\u1ecf nh\u1ea5t n\u00ean a, b nh\u1ecf nh\u1ea5t $\\Rightarrow$ a = 2, b = 3 <br\/> S\u1ed1 A c\u00f3 15 \u01b0\u1edbc n\u00ean ta c\u00f3: (x + 1) . (y + 1) = 15 <br\/> (x + 1) . (y + 1) = 3 . 5 = 1 . 15 <br\/> TH1: $\\begin{cases}x + 1 = 3 \\\\ y + 1 = 5 \\end{cases}$ $\\Rightarrow$ $\\begin{cases}x = 2 \\\\ y = 4 \\end{cases}$ <br\/> $\\Rightarrow$ $A = 2^2 . 3^4 = 4 . 81 = 324$ <br\/> TH2: $\\begin{cases}x + 1 = 5 \\\\ y + 1 = 3 \\end{cases}$ $\\Rightarrow$ $\\begin{cases}x = 4 \\\\ y = 2 \\end{cases}$ <br\/> $\\Rightarrow$ $A = 2^4 . 3^2 = 16 . 9 = 144$ <br\/> TH3: $\\begin{cases}x + 1 = 15 \\\\ y + 1 = 1 \\end{cases}$ $\\Rightarrow$ $\\begin{cases}x = 14 \\\\ y = 0 \\end{cases}$ <br\/> $\\Rightarrow$ $A = 2^{14}$ = 16384 <br\/> TH4: $\\begin{cases}x + 1 = 1 \\\\ y + 1 = 15 \\end{cases}$ $\\Rightarrow$ $\\begin{cases}x = 0 \\\\ y = 14 \\end{cases}$ <br\/> $\\Rightarrow$ $A = 3^{14} = 4 782 969$ <br\/> V\u00ec s\u1ed1 A c\u1ea7n t\u00ecm l\u00e0 nh\u1ecf nh\u1ea5t n\u00ean A = 144 <br\/> <span class='basic_pink'> V\u1eady s\u1ed1 nh\u1ecf nh\u1ea5t c\u00f3 15 \u01b0\u1edbc l\u00e0: 144 <\/span> "}]}],"id_ques":659},{"time":14,"part":[{"title":"Ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang","title_trans":"","temp":"multiple_choice","correct":[[1]],"list":[{"point":5,"select":["A. $2^3.5.31$","B. $2^2.5.31$","C. $2^4.5.31$"],"ques":"Ph\u00e2n t\u00edch s\u1ed1 1240 ra th\u1eeba s\u1ed1 nguy\u00ean t\u1ed1 ta \u0111\u01b0\u1ee3c:","hint":"Chia s\u1ed1 1240 cho c\u00e1c \u01b0\u1edbc nguy\u00ean t\u1ed1","explain":"<span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span><br\/> Ta c\u00f3: $1240 = 2 . 2 . 2 . 5 . 31 = 2^3 . 5 . 31$ <\/span>"}]}],"id_ques":660}],"lesson":{"save":0,"level":3}}