{"segment":[{"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":[[["5"]]],"list":[{"point":10,"width":50,"type_input":"","ques":"T\u00ecm x bi\u1ebft: 3. (x + 3) = 12. (6 - x) + 12 <br\/> V\u1eady x = _input_","hint":"Nh\u00e2n ph\u00e1 ngo\u1eb7c r\u1ed3i t\u00ednh","explain":"<span class='basic_left'><span class='basic_green'>H\u01b0\u1edbng d\u1eabn:<\/span><br\/> <b> B\u01b0\u1edbc 1: <\/b> \u00c1p d\u1ee5ng t\u00ednh ch\u1ea5t: a. (b + c) = a . b + a . c \u0111\u1ec3 t\u00ednh <br\/> 3x + 9 = 72 - 12x + 12 <br\/> <b> B\u01b0\u1edbc 2: <\/b> Coi 3x l\u00e0 s\u1ed1 h\u1ea1ng ch\u01b0a bi\u1ebft, (72 - 12x + 12) l\u00e0 t\u1ed5ng <br\/> Mu\u1ed1n t\u00ecm s\u1ed1 h\u1ea1ng ch\u01b0a bi\u1ebft ta l\u1ea5y t\u1ed5ng tr\u1eeb \u0111i s\u1ed1 h\u1ea1ng \u0111\u00e3 bi\u1ebft <br\/> <b> B\u01b0\u1edbc 3: <\/b> Coi 12x l\u00e0 s\u1ed1 tr\u1eeb , 3x l\u00e0 hi\u1ec7u<br\/> S\u1ed1 b\u1ecb tr\u1eeb b\u1eb1ng hi\u1ec7u c\u1ed9ng v\u1edbi s\u1ed1 tr\u1eeb<\/span><br\/> <br\/> <span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span><br\/> $\\begin{align*}3. (x + 3) =& 12.(6 - x) + 12 \\\\ 3x + 9 =& 72 - 12x + 12 \\\\ 3x =& 84 - 12x - 9 \\\\3x =& 75 - 12x \\\\ 3x + 12x =& 75 \\\\ 15x =& 75 \\\\ x =& 5 \\end{align*}$ <br\/><span class='basic_pink'>V\u1eady s\u1ed1 c\u1ea7n \u0111i\u1ec1n l\u00e0: 5<\/span>"}]}],"id_ques":241},{"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":[[["58"]]],"list":[{"point":10,"width":50,"type_input":"","ques":"T\u00ecm x bi\u1ebft: 2x + (5 - x) + 3 . (x - 79) = 0<br\/> V\u1eady x = _input_","hint":"Ph\u00e1 ngo\u1eb7c r\u1ed3i t\u00ednh","explain":"<span class='basic_left'><span class='basic_green'>H\u01b0\u1edbng d\u1eabn:<\/span><br\/><b> B\u01b0\u1edbc 1: <\/b> Ph\u00e1 ngo\u1eb7c <br\/> <b> B\u01b0\u1edbc 2: <\/b> Nh\u00f3m c\u00e1c s\u1ed1 h\u1ea1ng c\u00f3 x l\u1ea1i r\u1ed3i t\u00ednh <\/span><br\/> <br\/> <span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span><br\/> $\\begin{align*}2x + (5 - x) + 3 . (x - 79) =& 0 \\\\ 2x + 5 - x + 3x - 237 =& 0 \\\\ (2x - x + 3x) - (237 - 5) =& 0 \\\\ 4x - 232 =& 0 \\\\ 4x =& 232 \\\\ x =& 232 : 4 \\\\ x =& 58 \\end{align*}$ <br\/><span class='basic_pink'>V\u1eady s\u1ed1 c\u1ea7n \u0111i\u1ec1n l\u00e0: 58<\/span>"}]}],"id_ques":242},{"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":[[["111"]]],"list":[{"point":10,"width":50,"type_input":"","ques":"Th\u01b0\u01a1ng c\u1ee7a s\u1ed1 l\u1edbn nh\u1ea5t c\u00f3 3 ch\u1eef s\u1ed1 v\u00e0 9 l\u00e0: _input_","hint":"T\u00ecm s\u1ed1 l\u1edbn nh\u1ea5t c\u00f3 3 ch\u1eef s\u1ed1 r\u1ed3i t\u00ecm th\u01b0\u01a1ng c\u1ee7a s\u1ed1 \u0111\u00f3 v\u1edbi 9","explain":"<span class='basic_left'><span class='basic_green'>H\u01b0\u1edbng d\u1eabn:<\/span><br\/> T\u00ecm s\u1ed1 l\u1edbn nh\u1ea5t c\u00f3 3 ch\u1eef s\u1ed1 <br\/> T\u00ecm th\u01b0\u01a1ng c\u1ee7a s\u1ed1 \u0111\u00f3 v\u1edbi 9 <\/span> <br\/><br\/><span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span><br\/> S\u1ed1 l\u1edbn nh\u1ea5t c\u00f3 3 ch\u1eef s\u1ed1 l\u00e0: 999 <br\/> Th\u01b0\u01a1ng c\u1ee7a s\u1ed1 \u0111\u00f3 v\u1edbi 9 l\u00e0: <br\/> 999 : 9 = 111 <br\/> <span class='basic_pink'>V\u1eady s\u1ed1 c\u1ea7n \u0111i\u1ec1n l\u00e0: 111<\/span>"}]}],"id_ques":243},{"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":[[["101"]]],"list":[{"point":10,"width":50,"type_input":"","ques":"<center><img src='https://www.luyenthi123.com/file/luyenthi123/lop6/toan/daiso/bai5/lv3/img\/4.jpg' \/><\/center> <br\/>$\\overline{abab} : \\overline{ab}$ = _input_","hint":"Ph\u00e2n t\u00edch $\\overline{abab}$ theo c\u1ea5u t\u1ea1o s\u1ed1 r\u1ed3i th\u1ef1c hi\u1ec7n chia 1 t\u1ed5ng cho 1 s\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 $\\overline{abab}$ theo c\u1ea5u t\u1ea1o s\u1ed1 <br\/> $\\overline{abab} = \\overline{ab} .100 + \\overline{ab}$ <br\/> <b> B\u01b0\u1edbc 2: <\/b> Th\u1ef1c hi\u1ec7n chia 1 t\u1ed5ng cho 1 s\u1ed1 <br\/> Mu\u1ed1n chia 1 t\u1ed5ng cho 1 s\u1ed1 ta chia t\u1eebng s\u1ed1 h\u1ea1ng c\u1ee7a t\u1ed5ng cho s\u1ed1 \u0111\u00f3<\/span><br\/> <br\/> <span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span><br\/> $\\begin{align*} \\overline{abab} : \\overline{ab} &= (\\overline{ab} . 100 + \\overline{ab}) : \\overline{ab}\\\\ &= \\overline{ab}.100 : \\overline{ab} + \\overline{ab} : \\overline{ab}\\\\ &= 100 + 1 \\\\&= 101 \\end{align*}$ <br\/> <span class='basic_pink'> V\u1eady s\u1ed1 c\u1ea7n \u0111i\u1ec1n l\u00e0: 101 <\/span> <br\/><span class='basic_green'> <i>L\u01b0u \u00fd: Mu\u1ed1n chia m\u1ed9t t\u1ed5ng cho 1 s\u1ed1 ta chia t\u1eebng s\u1ed1 h\u1ea1ng c\u1ee7a t\u1ed5ng cho s\u1ed1 \u0111\u00f3 <br\/> (a + b) : c = a : c + b : c <\/i><\/span>"}]}],"id_ques":244},{"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":[[["757"],["13"]]],"list":[{"point":10,"width":50,"type_input":"","ques":"M\u1ed9t ph\u00e9p chia c\u00f3 t\u1ed5ng s\u1ed1 b\u1ecb chia v\u00e0 s\u1ed1 chia l\u00e0 770. Bi\u1ebft r\u1eb1ng th\u01b0\u01a1ng l\u00e0 58 v\u00e0 s\u1ed1 d\u01b0 b\u1eb1ng 3. T\u00ecm s\u1ed1 b\u1ecb chia v\u00e0 s\u1ed1 chia? <br\/> S\u1ed1 b\u1ecb chia l\u00e0: _input_ <br\/> S\u1ed1 chia l\u00e0: _input_","hint":"S\u1ed1 b\u1ecb chia = th\u01b0\u01a1ng x s\u1ed1 chia + s\u1ed1 d\u01b0","explain":"<span class='basic_left'><span class='basic_green'>H\u01b0\u1edbng d\u1eabn:<\/span><br\/>V\u00ec ph\u00e9p chia c\u00f3 th\u01b0\u01a1ng l\u00e0 58 ngh\u0129a l\u00e0: 58 x s\u1ed1 chia (SC) + d\u01b0 = s\u1ed1 b\u1ecb chia (SBC) <br\/> Bi\u1ebft t\u1ed5ng c\u1ee7a SBC v\u00e0 SC l\u00e0 770 d\u1ef1a v\u00e0o \u0111\u00f3 ta t\u00ednh \u0111\u01b0\u1ee3c SBC v\u00e0 SC<\/span><br\/> <br\/> <span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span><br\/> V\u00ec ph\u00e9p chia c\u00f3 th\u01b0\u01a1ng l\u00e0 58 ngh\u0129a 58 l\u1ea7n s\u1ed1 chia c\u1ed9ng th\u00eam 3 th\u00ec b\u1eb1ng s\u1ed1 b\u1ecb chia <br\/> SC . 58 + 3 = SBC <br\/> V\u00ec t\u1ed5ng c\u1ee7a SBC v\u00e0 SC l\u00e0 770 n\u00ean ta c\u00f3: <br\/> SC + SBC = 770 <br\/> Hay SC + 58. SC + 3 = 770 <br\/> 59. SC = 767 <br\/> SC = 13 <br\/> Suy ra: SBC = 58. SC + 3 = 58 . 13 + 3 = 757 <br\/> V\u1eady s\u1ed1 b\u1ecb chia l\u00e0 757, s\u1ed1 chia l\u00e0 13<br\/><span class='basic_pink'> V\u1eady s\u1ed1 c\u1ea7n \u0111i\u1ec1n l\u00e0: 757; 13<\/span>"}]}],"id_ques":245},{"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":[[["12"],["8"]]],"list":[{"point":10,"width":80,"type_input":"","ques":"T\u00ecm hai s\u1ed1 bi\u1ebft t\u1ed5ng c\u1ee7a ch\u00fang g\u1ea5p 5 l\u1ea7n hi\u1ec7u c\u1ee7a ch\u00fang v\u00e0 t\u00edch c\u1ee7a ch\u00fang g\u1ea5p 24 l\u1ea7n hi\u1ec7u c\u1ee7a ch\u00fang<br\/> S\u1ed1 l\u1edbn l\u00e0: _input_ <br\/> S\u1ed1 b\u00e9 l\u00e0: _input_","hint":"G\u1ecdi hi\u1ec7u hai s\u1ed1 l\u00e0 a suy ra t\u1ed5ng hai s\u1ed1 l\u00e0 5a, t\u00edch hai s\u1ed1 l\u00e0 24a","explain":"<span class='basic_left'><span class='basic_green'>H\u01b0\u1edbng d\u1eabn:<\/span><br\/>V\u00ec b\u00e0i cho t\u1ed5ng hai s\u1ed1 g\u1ea5p 5 l\u1ea7n hi\u1ec7u hai s\u1ed1, v\u00e0 t\u00edch g\u1ea5p 24 l\u1ea7n hi\u1ec7u <br\/> N\u00ean ta g\u1ecdi hi\u1ec7u hai s\u1ed1 l\u00e0 a, t\u1ed5ng hai s\u1ed1 l\u00e0 5a, t\u00edch hai s\u1ed1 l\u00e0 24a <br\/> <b> B\u01b0\u1edbc 1: <\/b>T\u00ecm m\u1ed1i li\u00ean h\u1ec7 c\u1ee7a s\u1ed1 l\u1edbn v\u00e0 s\u1ed1 b\u00e9 v\u1edbi a d\u1ef1a v\u00e0o t\u1ed5ng v\u00e0 hi\u1ec7u <br\/> <b> B\u01b0\u1edbc 2: <\/b>T\u00ecm s\u1ed1 l\u1edbn v\u00e0 s\u1ed1 b\u00e9 d\u1ef1a v\u00e0o t\u00edch v\u00e0 k\u1ebft qu\u1ea3 b\u01b0\u1edbc 1<\/span><br\/> <br\/> <span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span><br\/> Theo \u0111\u1ec1 b\u00e0i ta th\u1ea5y t\u1ed5ng v\u00e0 t\u00edch hai s\u1ed1 \u0111\u1ec1u li\u00ean quan \u0111\u1ebfn hi\u1ec7u n\u00ean ta g\u1ecdi hi\u1ec7u hai s\u1ed1 l\u00e0 a ($a \\neq 0$)<br\/> T\u1ed5ng hai s\u1ed1 l\u00e0: 5a <br\/> T\u00edch hai s\u1ed1 l\u00e0: 24a <br\/> S\u1ed1 b\u00e9 l\u00e0: (5a - a) : 2 = 2a <br\/> S\u1ed1 l\u1edbn l\u00e0: 5a - 2a = 3a <br\/> V\u00ec t\u00edch hai s\u1ed1 l\u00e0 24a n\u00ean ta c\u00f3: <br\/> S\u1ed1 l\u1edbn l\u00e0: 24a : 2a = 12 <br\/> S\u1ed1 b\u00e9 l\u00e0: 24a : 3a = 8<br\/><span class='basic_pink'> V\u1eady c\u00e1c s\u1ed1 c\u1ea7n \u0111i\u1ec1n l\u00e0: 12; 8<\/span>"}]}],"id_ques":246},{"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":[[["17"]]],"list":[{"point":10,"width":80,"type_input":"","ques":"T\u00ecm th\u01b0\u01a1ng c\u1ee7a m\u1ed9t ph\u00e9p chia bi\u1ebft n\u1ebfu th\u00eam 73 \u0111\u01a1n v\u1ecb v\u00e0o s\u1ed1 b\u1ecb chia v\u00e0 4 \u0111\u01a1n v\u1ecb v\u00e0o s\u1ed1 chia th\u00ec th\u01b0\u01a1ng kh\u00f4ng \u0111\u1ed5i v\u00e0 d\u01b0 t\u0103ng 5 \u0111\u01a1n v\u1ecb <br\/>Th\u01b0\u01a1ng l\u00e0: _input_","hint":"T\u00ecm m\u1ed1i li\u00ean h\u1ec7 gi\u1eefa ph\u00e9p chia ban \u0111\u1ea7u v\u00e0 ph\u00e9p chia m\u1edbi \u0111\u1ec3 t\u00ednh th\u01b0\u01a1ng","explain":"<span class='basic_left'><span class='basic_green'>H\u01b0\u1edbng d\u1eabn:<\/span><br\/>G\u1ecdi s\u1ed1 b\u1ecb chia l\u00e0 a, s\u1ed1 chia l\u00e0 b, th\u01b0\u01a1ng l\u00e0 x, d\u01b0 l\u00e0 r ta c\u00f3: a = b.x + r <br\/> Sau khi th\u00eam 73 \u0111\u01a1n v\u1ecb v\u00e0o s\u1ed1 b\u1ecb chia: a + 73 <br\/> Sau khi th\u00eam 4 \u0111\u01a1n v\u1ecb v\u00e0o s\u1ed1 chia: b + 4 th\u00ec th\u01b0\u01a1ng kh\u00f4ng \u0111\u1ed5i v\u00e0 d\u01b0 t\u0103ng 5 \u0111\u01a1n v\u1ecb<br\/> T\u00ecm m\u1ed1i li\u00ean h\u1ec7 gi\u1eefa ph\u00e9p chia tr\u01b0\u1edbc v\u00e0 sau khi th\u00eam \u0111\u1ec3 t\u00ednh th\u01b0\u01a1ng<\/span><br\/> <br\/> <span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span><br\/> G\u1ecdi s\u1ed1 b\u1ecb chia l\u00e0 a, s\u1ed1 chia l\u00e0 b, th\u01b0\u01a1ng l\u00e0 x, d\u01b0 l\u00e0 r <br\/> Ta c\u00f3: a = b . x + r (r < b) (1)<br\/> Sau khi th\u00eam 73 \u0111\u01a1n v\u1ecb v\u00e0o s\u1ed1 b\u1ecb chia ta \u0111\u01b0\u1ee3c: a + 73 <br\/> Sau khi th\u00eam 4 \u0111\u01a1n v\u1ecb v\u00e0o s\u1ed1 chia ta \u0111\u01b0\u1ee3c: b + 4 <br\/> V\u00ec th\u01b0\u01a1ng kh\u00f4ng \u0111\u1ed1i d\u01b0 t\u0103ng 5 \u0111\u01a1n v\u1ecb n\u00ean ta c\u00f3: a + 73 = (b + 4) . x + r + 5 (2) <br\/> L\u1ea5y (2) - (1) ta \u0111\u01b0\u1ee3c: <br\/> (a + 73) - a = [(b + 4) . x + r + 5] - (b . x + r) <br\/> a + 73 - a = b . x + 4 . x + r + 5 - b . x - r <br\/> 73 = 4 . x + 5 <br\/> 4 . x = 73 - 5 <br\/> x = 17 <br\/> <span class='basic_pink'>V\u1eady th\u01b0\u01a1ng c\u1ea7n t\u00ecm l\u00e0: 17<\/span>"}]}],"id_ques":247},{"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":[[["999"],["444"]]],"list":[{"point":10,"width":80,"type_input":"","ques":"Khi chia 1 s\u1ed1 t\u1ef1 nhi\u00ean g\u1ed3m 3 ch\u1eef s\u1ed1 nh\u01b0 nhau cho 1 s\u1ed1 t\u1ef1 nhi\u00ean g\u1ed3m 3 ch\u1eef s\u1ed1 nh\u01b0 nhau ta \u0111\u01b0\u1ee3c th\u01b0\u01a1ng l\u00e0 2 v\u00e0 c\u00f2n d\u01b0. N\u1ebfu x\u00f3a m\u1ed9t ch\u1eef s\u1ed1 \u1edf s\u1ed1 chia v\u00e0 x\u00f3a m\u1ed9t ch\u1eef s\u1ed1 \u1edf s\u1ed1 b\u1ecb chia th\u00ec th\u01b0\u01a1ng c\u1ee7a ph\u00e9p chia v\u1eabn b\u1eb1ng 2 nh\u01b0ng s\u1ed1 d\u01b0 gi\u1ea3m h\u01a1n tr\u01b0\u1edbc l\u00e0 100. T\u00ecm s\u1ed1 b\u1ecb chia v\u00e0 s\u1ed1 chia (l\u1edbn nh\u1ea5t) l\u00fac \u0111\u1ea7u? <br\/>S\u1ed1 b\u1ecb chia l\u00e0: _input_ <br\/> S\u1ed1 chia l\u00e0: _input_","hint":"G\u1ecdi s\u1ed1 b\u1ecb chia l\u00e0 $\\overline{aaa}$ s\u1ed1 chia l\u00e0 $\\overline{bbb}$ d\u01b0 l\u00e0 r, ta c\u00f3: $\\overline{aaa}$ = $\\overline{bbb}$. 2 + r <br\/> Ph\u00e2n t\u00edch theo c\u1ea5u t\u1ea1o s\u1ed1 \u0111\u1ec3 t\u00ecm s\u1ed1 \u0111\u00f3","explain":"<span class='basic_left'><span class='basic_green'>H\u01b0\u1edbng d\u1eabn:<\/span><br\/>G\u1ecdi s\u1ed1 b\u1ecb chia l\u00e0 $\\overline{aaa}$ s\u1ed1 chia l\u00e0 $\\overline{bbb}$ d\u01b0 l\u00e0 r <br\/> Ta c\u00f3: $\\overline{aaa}$ = $\\overline{bbb}$. 2 + r <br\/> khi x\u00f3a 1 ch\u1eef s\u1ed1 \u1edf s\u1ed1 b\u1ecb chia v\u00e0 1 ch\u1eef s\u1ed1 \u1edf s\u1ed1 chia ta \u0111\u01b0\u1ee3c $\\overline{aa}$ = $\\overline{bb}$. 2 + (r - 100) <br\/> T\u00ecm m\u1ed1i li\u00ean h\u1ec7 v\u00e0 t\u00ecm s\u1ed1 b\u1ecb chia v\u00e0 s\u1ed1 chia<\/span><br\/> <br\/> <span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span><br\/>G\u1ecdi s\u1ed1 b\u1ecb chia l\u00e0 $\\overline{aaa}$ s\u1ed1 chia l\u00e0 $\\overline{bbb}$ d\u01b0 l\u00e0 r <br\/> Ta c\u00f3: $\\overline{aaa}$ = $\\overline{bbb}$. 2 + r (1)<br\/> Sau khi x\u00f3a 1 ch\u1eef s\u1ed1 \u1edf s\u1ed1 b\u1ecb chia v\u00e0 x\u00f3a 1 ch\u1eef s\u1ed1 \u1edf s\u1ed1 chia ta \u0111\u01b0\u1ee3c: $\\overline{aa}$ = $\\overline{bb}$. 2 + (r - 100) (2) <br\/> l\u1ea5y (1) - (2) ta c\u00f3: $\\overline{aaa}$ - $\\overline{aa}$ = ($\\overline{bbb}$ . 2 + r)- ($\\overline{bb}$. 2 + r - 100) <br\/> a. 100 + $\\overline{aa}$ - $\\overline{aa}$ = $\\overline{bbb} . 2$ + r - $\\overline{bb}. 2$ - r + 100 <br\/> a . 100 = 2. ($\\overline{bbb}$ - $\\overline{bb}$) + 100 <br\/>a . 100 = 2 . b . 100 + 100 <br\/> $\\overline{a00}$ = 2. $\\overline{b00}$ + 100 <br\/> <table><tr><th>b<\/th><th>1<\/th><th>2<\/th><th>3<\/th><th>4<\/th><\/tr><tr><td>a<\/td><td>3<\/td><td>5<\/td><td>7<\/td><td>9<\/td><\/tr><\/table> <br\/> Gi\u00e1 tr\u1ecb l\u1edbn nh\u1ea5t l\u00e0 a = 9, b = 4 <br\/> Th\u1eed l\u1ea1i: 999 = 444 . 2 + 111 v\u00e0 99 = 44 . 2 + 11 (\u0111\u00fang) <br\/> <br\/><span class='basic_pink'> V\u1eady s\u1ed1 b\u1ecb chia l\u1edbn nh\u1ea5t l\u00e0: 999<br\/> S\u1ed1 chia l\u1edbn nh\u1ea5t l\u00e0: 444<\/span>"}]}],"id_ques":248},{"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":[[["100"]]],"list":[{"point":10,"width":80,"type_input":"","ques":"T\u00ednh nhanh: <br\/> (1374 . 57 + 687 . 86) : (26 . 13 + 74 . 14)= _input_","hint":"T\u00e1ch: 687 . 86 = 687 . 2 . 43; 14 = 13 + 1","explain":"<span class='basic_left'><span class='basic_green'>H\u01b0\u1edbng d\u1eabn:<\/span><br\/> Nh\u1eadn th\u1ea5y 687 . 2 = 1374 n\u00ean vi\u1ebft 687. 86 = 687 . 2 . 43 = 1374 . 43 <br\/> 26 . 13 + 74 . 14 kh\u00f4ng c\u00f3 nh\u00e2n t\u1eed chung <br\/> N\u00ean ta t\u00e1ch 14 = 13 + 1 \u0111\u1ec3 xu\u1ea5t hi\u1ec7n nh\u00e2n t\u1eed chung<\/span><br\/> <br\/> <span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span><br\/> $\\begin{align*} &(1374 . 57 + 687 . 86) : (26 . 13 + 74 . 14) \\\\ =& (1374 . 57 + 687 . 2 . 43) : [26 . 13 + 74 . (13 + 1)] \\\\ =& (1374 . 57 + 1374 . 43) : [26 . 13 + 74 . 13 + 74] \\\\ =& 1374. (57 + 43) : [13.(26 + 74) + 74] \\\\ =& 1374 . 100 : [13.100 + 74] \\\\ =& 137400 : (1300 + 74) \\\\ =& 137400 : 1374 \\\\ =& 100\\end{align*}$ <br\/><span class='basic_pink'> V\u1eady s\u1ed1 c\u1ea7n \u0111i\u1ec1n l\u00e0: 100<\/span>"}]}],"id_ques":249},{"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":[[["135"]]],"list":[{"point":10,"width":80,"type_input":"","ques":"Ng\u01b0\u1eddi ta c\u1ed9ng 5 s\u1ed1 v\u00e0 chia cho 5 th\u00ec \u0111\u01b0\u1ee3c 138. N\u1ebfu x\u1ebfp c\u00e1c s\u1ed1 theo th\u1ee9 t\u1ef1 l\u1edbn d\u1ea7n th\u00ec c\u1ed9ng 3 s\u1ed1 \u0111\u1ea7u ti\u00ean v\u00e0 chia cho 3 s\u1ebd \u0111\u01b0\u1ee3c 127, c\u1ed9ng 3 s\u1ed1 cu\u1ed1i v\u00e0 chia cho 3 s\u1ebd \u0111\u01b0\u1ee3c 148. B\u1ea1n c\u00f3 bi\u1ebft s\u1ed1 \u0111\u1ee9ng gi\u1eefa theo th\u1ee9 t\u1ef1 tr\u00ean l\u00e0 s\u1ed1 n\u00e0o kh\u00f4ng?<br\/> S\u1ed1 \u0111\u00f3 l\u00e0: _input_","hint":"Nh\u00f3m c\u00e1c s\u1ed1 h\u1ea1ng \u0111\u1ec3 khi c\u1ed9ng ho\u1eb7c tr\u1eeb ta \u0111\u01b0\u1ee3c s\u1ed1 tr\u00f2n ch\u1ee5c, tr\u00f2n tr\u0103m hay tr\u00f2n ngh\u00ecn","explain":"<span class='basic_left'><span class='basic_green'>H\u01b0\u1edbng d\u1eabn:<\/span><br\/> Nh\u00f3m c\u00e1c s\u1ed1 h\u1ea1ng \u0111\u1ec3 khi c\u1ed9ng ho\u1eb7c tr\u1eeb ta \u0111\u01b0\u1ee3c s\u1ed1 tr\u00f2n ch\u1ee5c, tr\u00f2n tr\u0103m hay tr\u00f2n ngh\u00ecn<\/span><br\/> <br\/> <span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span><br\/> V\u00ec 138 l\u00e0 trung b\u00ecnh c\u1ed9ng c\u1ee7a 5 s\u1ed1 <br\/> n\u00ean t\u1ed5ng 5 s\u1ed1 l\u00e0: 5 . 138 = 690 <br\/> T\u1ed5ng c\u1ee7a 3 s\u1ed1 \u0111\u1ea7u ti\u00ean l\u00e0: 127 . 3 = 381 <br\/> T\u1ed5ng c\u1ee7a 3 s\u1ed1 cu\u1ed1i l\u00e0: 148 . 3 = 444 <br\/> V\u00ec trong t\u1ed5ng c\u1ee7a 3 s\u1ed1 \u0111\u1ea7u v\u00e0 t\u1ed5ng c\u1ee7a 3 s\u1ed1 cu\u1ed1i \u0111\u1ec1u c\u00f3 s\u1ed1 \u0111\u1ee9ng gi\u1eefa <br\/> N\u00ean t\u1ed5ng c\u1ee7a hai s\u1ed1 \u0111\u1ea7u ti\u00ean b\u1eb1ng t\u1ed5ng 5 s\u1ed1 tr\u1eeb t\u1ed5ng 3 s\u1ed1 cu\u1ed1i <br\/>T\u1ed5ng c\u1ee7a hai s\u1ed1 d\u1ea7u ti\u00ean l\u00e0: 690 - 444 = = 246 <br\/> S\u1ed1 \u0111\u1ee9ng gi\u1eefa l\u00e0: 381 - 246 = 135 <br\/><span class='basic_pink'> V\u1eady s\u1ed1 c\u1ea7n \u0111i\u1ec1n l\u00e0: 135<\/span>"}]}],"id_ques":250}],"lesson":{"save":0,"level":3}}