{"segment":[{"time":24,"part":[{"title":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","title_trans":"","temp":"multiple_choice","correct":[[4]],"list":[{"point":10,"ques":"Cho 5 s\u1ed1 t\u1ef1 nhi\u00ean 1; 0; 3; 4; 9. <br\/>C\u00f3 th\u1ec3 l\u1eadp \u0111\u01b0\u1ee3c bao nhi\u00eau s\u1ed1 t\u1ef1 nhi\u00ean c\u00f3 2 ch\u1eef s\u1ed1 kh\u00e1c nhau t\u1eeb c\u00e1c s\u1ed1 tr\u00ean?","select":["A. 10 s\u1ed1 ","B. 12 s\u1ed1 ","C. 15 s\u1ed1 ","D. 16 s\u1ed1 "],"hint":"M\u1ed7i s\u1ed1 gh\u00e9p \u0111\u00f4i v\u1edbi 1 s\u1ed1 c\u00f2n l\u1ea1i \u0111\u01b0\u1ee3c 2 s\u1ed1 c\u00f3 2 ch\u1eef s\u1ed1, ri\u00eang s\u1ed1 0 gh\u00e9p \u0111\u00f4i v\u1edbi 1 s\u1ed1 c\u00f2n l\u1ea1i th\u00ec \u0111\u01b0\u1ee3c 1 s\u1ed1 c\u00f3 2 ch\u1eef s\u1ed1","explain":"<span class='basic_left'><span class='basic_green'>H\u01b0\u1edbng d\u1eabn: <\/span> <br\/> L\u1ea5y c\u00e1c s\u1ed1 1; 3; 4; 9 l\u00e0m ch\u1eef s\u1ed1 h\u00e0ng ch\u1ee5c v\u00e0 vi\u1ebft c\u00e1c ch\u1eef s\u1ed1 h\u00e0ng \u0111\u01a1n v\u1ecb t\u01b0\u01a1ng \u1ee9ng t\u1eeb c\u00e1c s\u1ed1 \u0111\u00e3 cho<br\/> <br\/><\/span><span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span> <br\/> <br\/> Ch\u1ecdn l\u1ea7n l\u01b0\u1ee3t c\u00e1c s\u1ed1 1; 3; 4; 9 l\u00e0m ch\u1eef s\u1ed1 h\u00e0ng ch\u1ee5c <br\/>Ta c\u00f3 h\u00ecnh v\u1ebd: <center><img src='https://www.luyenthi123.com/file/luyenthi123/lop6/toan/daiso/bai2/lv3/img\/D612_K101.png' <br\/><\/center><br\/> Nh\u00ecn v\u00e0o h\u00ecnh v\u1ebd ta th\u1ea5y c\u00f3 th\u1ec3 vi\u1ebft \u0111\u01b0\u1ee3c 16 s\u1ed1 c\u00f3 hai ch\u1eef s\u1ed1 kh\u00e1c nhau t\u1eeb c\u00e1c s\u1ed1 tr\u00ean <br\/><span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0: D<\/span>","column":2}]}],"id_ques":91},{"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":[[["192"]]],"list":[{"point":10,"width":40,"type_input":"","ques":"Vi\u1ebft c\u00e1c s\u1ed1 t\u1ef1 nhi\u00ean t\u1eeb 1 \u0111\u1ebfn 100 k\u1ebf ti\u1ebfp nhau t\u1eeb tr\u00e1i qua ph\u1ea3i th\u00e0nh d\u00e3y 1234567891011...99100 <br\/> D\u00e3y s\u1ed1 tr\u00ean c\u00f3: _input_ ch\u1eef s\u1ed1","hint":"T\u00ednh s\u1ed1 ch\u1eef s\u1ed1 c\u1ee7a c\u00e1c s\u1ed1 c\u00f3 1 ch\u1eef s\u1ed1, c\u00e1c s\u1ed1 c\u00f3 2 ch\u1eef s\u1ed1 v\u00e0 c\u00f3 3 ch\u1eef s\u1ed1 sau \u0111\u00f3 c\u1ed9ng l\u1ea1i","explain":"<span class='basic_left'><span class='basic_green'>H\u01b0\u1edbng d\u1eabn:<\/span><br\/> <b> B\u01b0\u1edbc 1:<\/b> T\u00ednh s\u1ed1 ch\u1eef s\u1ed1 c\u1ee7a c\u00e1c s\u1ed1 t\u1eeb 1 \u0111\u1ebfn 9? <br\/> <b> B\u01b0\u1edbc 2: <\/b> T\u00ednh s\u1ed1 ch\u1eef s\u1ed1 c\u1ee7a c\u00e1c s\u1ed1 t\u1eeb 10 \u0111\u1ebfn 99<br\/> <b>B\u01b0\u1edbc 3: <\/b>T\u00ednh s\u1ed1 ch\u1eef s\u1ed1 c\u1ee7a s\u1ed1 100<br\/> <b> B\u01b0\u1edbc 4: <\/b> T\u00ednh s\u1ed1 ch\u1eef s\u1ed1 c\u1ee7a d\u00e3y 123456...99100<br\/> <\/span> <br\/><br\/><span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span><br\/> <br\/> T\u1eeb 1 \u0111\u1ebfn 9 c\u00f3: 9 ch\u1eef s\u1ed1 <br\/> T\u1eeb 10 \u0111\u1ebfn 99 c\u00f3: [(99 - 10) + 1] . 2 = 180 ch\u1eef s\u1ed1 <br\/> S\u1ed1 100 c\u00f3 3 ch\u1eef s\u1ed1 <br\/> V\u1eady d\u00e3y 1234567891011...99100 c\u00f3: <br\/> 9 + 180 + 3 = 192 ch\u1eef s\u1ed1 <br\/><span class='basic_pink'> V\u1eady s\u1ed1 c\u1ea7n \u0111i\u1ec1n l\u00e0: 192<\/span>"}]}],"id_ques":92},{"time":24,"part":[{"title":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","title_trans":"","temp":"multiple_choice","correct":[[3]],"list":[{"point":10,"ques":"S\u1ed1 75 trong h\u1ec7 La M\u00e3 vi\u1ebft l\u00e0: ","select":["A. LXV ","B. CXV ","C. LXXV ","D. CXXV"],"hint":"Trong h\u1ec7 La M\u00e3 L l\u00e0 50, X l\u00e0 10, V l\u00e0 5","explain":"<span class='basic_left'><span class='basic_green'>H\u01b0\u1edbng d\u1eabn: <\/span> <br\/>V\u00ec trong h\u1ec7 La M\u00e3 kh\u00f4ng c\u00f3 s\u1ed1 70 n\u00ean 75 \u0111\u01b0\u1ee3c t\u00e1ch ra th\u00e0nh 50, 10, 10 v\u00e0 5 <br\/> Vi\u1ebft c\u00e1c s\u1ed1 La M\u00e3 t\u01b0\u01a1ng \u1ee9ng r\u1ed3i gh\u00e9p l\u1ea1i \u0111\u1ec3 \u0111\u01b0\u1ee3c s\u1ed1 75<br\/> <br\/><\/span><span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span> <br\/> <br\/>V\u00ec trong h\u1ec7 La M\u00e3 kh\u00f4ng c\u00f3 s\u1ed1 70 n\u00ean 75 \u0111\u01b0\u1ee3c t\u00e1ch ra th\u00e0nh 50, 10, 10 v\u00e0 5 <br\/> V\u1eady trong h\u1ec7 La M\u00e3 75 \u0111\u01b0\u1ee3c vi\u1ebft l\u00e0: LXXV<br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0: C<\/span><br\/> L\u01b0u \u00fd: \u0110\u1ec3 vi\u1ebft s\u1ed1 t\u1ef1 nhi\u00ean trong h\u1ec7 La M\u00e3 tr\u01b0\u1edbc h\u1ebft ta c\u1ea7n vi\u1ebft s\u1ed1 \u0111\u00f3 d\u01b0\u1edbi d\u1ea1ng t\u1ed5ng c\u1ee7a c\u00e1c s\u1ed1, m\u1ed7i s\u1ed1 c\u00f3 gi\u00e1 tr\u1ecb b\u1eb1ng 1 ch\u1eef s\u1ed1 La M\u00e3. Sau \u0111\u00f3 vi\u1ebft c\u00e1c ch\u1eef s\u1ed1 La M\u00e3 theo th\u1ee9 t\u1ef1 t\u1eeb l\u1edbn \u0111\u1ebfn nh\u1ecf","column":2}]}],"id_ques":93},{"time":24,"part":[{"title":"\u0110i\u1ec1n s\u1ed1 th\u00edch h\u1ee3p v\u00e0o ch\u1ed7 tr\u1ed1ng","title_trans":"","temp":"fill_the_blank_random","correct":[[["1007"],["1008"]]],"list":[{"point":10,"width":60,"content":"","type_input":"","ques":"H\u00e3y t\u00ecm hai s\u1ed1 t\u1ef1 nhi\u00ean li\u00ean ti\u1ebfp m\u00e0 t\u1ed5ng b\u1eb1ng 2015 <br\/> Hai s\u1ed1 \u0111\u00f3 l\u00e0: _input_; _input_ ","hint":"B\u00e0i to\u00e1n t\u00ecm hai s\u1ed1 bi\u1ebft t\u1ed5ng hi\u1ec7u","explain":"<span class='basic_left'><span class='basic_green'>H\u01b0\u1edbng d\u1eabn:<\/span><br\/> V\u00ec hai s\u1ed1 t\u1ef1 nhi\u00ean li\u00ean ti\u1ebfp h\u01a1n k\u00e9m nhau 1 \u0111\u01a1n v\u1ecb n\u00ean hi\u1ec7u l\u00e0 1 <br\/> G\u1ecdi s\u1ed1 b\u00e9 l\u00e0 a, s\u1ed1 l\u1edbn l\u00e0 a + 1 <br\/> V\u00ec t\u1ed5ng 2 s\u1ed1 b\u1eb1ng 2015 n\u00ean a + (a + 1) = 2015 ta t\u00ecm \u0111\u01b0\u1ee3c a <\/span> <br\/> <br\/> <span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span><br\/> G\u1ecdi s\u1ed1 b\u00e9 l\u00e0 a, s\u1ed1 l\u1edbn l\u00e0 a + 1 <br\/> Theo \u0111\u1ec1 b\u00e0i ta c\u00f3: <br\/>$\\begin{align*} a + \\left(a + 1\\right) &= 2015 \\\\ a + a &= 2014 \\\\ a &= 1007\\end{align*}$<br\/> V\u1eady hai s\u1ed1 c\u1ea7n t\u00ecm l\u00e0 1007 v\u00e0 1008 <br\/><span class='basic_pink'>C\u00e1c s\u1ed1 c\u1ea7n \u0111i\u1ec1n l\u00e0: 1007; 1008<\/span>"}]}],"id_ques":94},{"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":[[["94"]]],"list":[{"point":10,"width":70,"content":"","type_input":"","ques":"S\u1ed1 94132 c\u00f3 s\u1ed1 ngh\u00ecn l\u00e0: _input_ ","hint":"T\u00e1ch s\u1ed1 94132 theo c\u1ea5u t\u1ea1o s\u1ed1 \u0111\u1ec3 t\u00ecm s\u1ed1 ngh\u00ecn","explain":"<span class='basic_left'><span class='basic_green'>H\u01b0\u1edbng d\u1eabn:<\/span><br\/> T\u00e1ch s\u1ed1 94132 theo c\u1ea5u t\u1ea1o s\u1ed1 \u0111\u1ec3 t\u00ecm s\u1ed1 ngh\u00ecn <\/span> <br\/> <br\/> <span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span><br\/> $\\begin{align*}94132 &= 90 000 + 4 000 + 132 \\\\ &= 90 \\text{ngh\u00ecn} + 4 \\text{ngh\u00ecn} + 132 \\text{\u0111\u01a1n v\u1ecb} \\\\ &= 94 \\text{ngh\u00ecn} + 132 \\text{\u0111\u01a1n v\u1ecb} \\end{align*}$<br\/> <span class='basic_pink'>V\u1eady s\u1ed1 94132 c\u00f3 s\u1ed1 ngh\u00ecn l\u00e0: 94 <\/span>"}]}],"id_ques":95},{"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":[[["12354"]]],"list":[{"point":10,"width":70,"content":"","type_input":"","ques":"H\u00e3y vi\u1ebft th\u00eam ch\u1eef s\u1ed1 5 xen gi\u1eefa c\u00e1c ch\u1eef s\u1ed1 c\u1ee7a s\u1ed1 1234 \u0111\u1ec3 \u0111\u01b0\u1ee3c s\u1ed1 nh\u1ecf nh\u1ea5t c\u00f3 th\u1ec3. <br\/> S\u1ed1 vi\u1ebft \u0111\u01b0\u1ee3c l\u00e0: _input_ ","hint":"Vi\u1ebft th\u00eam ch\u1eef s\u1ed1 5 xen gi\u1eefa c\u00e1c ch\u1eef s\u1ed1 c\u1ee7a s\u1ed1 1234 sau \u0111\u00f3 t\u00ecm s\u1ed1 nh\u1ecf nh\u1ea5t","explain":"<span class='basic_left'><span class='basic_green'>H\u01b0\u1edbng d\u1eabn:<\/span><br\/> V\u00ec s\u1ed1 1234 c\u00f3 4 ch\u1eef s\u1ed1 <br\/> N\u00ean s\u1ed1 vi\u1ebft th\u00eam v\u00e0o c\u00f3 th\u1ec3 \u0111\u1ee9ng gi\u1eefa ch\u1eef s\u1ed1 h\u00e0ng ngh\u00ecn v\u00e0 h\u00e0ng tr\u0103m <br\/> Ho\u1eb7c xen gi\u1eefa ch\u1eef s\u1ed1 h\u00e0ng tr\u0103m v\u00e0 h\u00e0ng ch\u1ee5c <br\/> Ho\u1eb7c xen gi\u1eefa ch\u1eef s\u1ed1 h\u00e0ng ch\u1ee5c v\u00e0 h\u00e0ng \u0111\u01a1n v\u1ecb<br\/> Ch\u1ecdn s\u1ed1 nh\u1ecf nh\u1ea5t<\/span> <br\/> <br\/> <span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span><br\/> Ta c\u00f3 th\u1ebf vi\u1ebft th\u00eam ch\u1eef s\u1ed1 5 xen gi\u1eefa c\u00e1c ch\u1eef s\u1ed1 c\u1ee7a s\u1ed1 1254 \u0111\u1ec3 \u0111\u01b0\u1ee3c c\u00e1c s\u1ed1 sau: 15234; 12534; 12354<br\/> S\u1ed1 nh\u1ecf nh\u1ea5t l\u00e0: 12354 <br\/><span class='basic_pink'>V\u1eady s\u1ed1 c\u1ea7n \u0111i\u1ec1n l\u00e0: 12354<\/span>"}]}],"id_ques":96},{"time":24,"part":[{"title":"\u0110i\u1ec1n s\u1ed1 th\u00edch h\u1ee3p v\u00e0o ch\u1ed7 tr\u1ed1ng","title_trans":"","temp":"fill_the_blank_random","correct":[[["41"],["14"],["28"],["82"]]],"list":[{"point":10,"width":60,"content":"","type_input":"","ques":"H\u00e3y vi\u1ebft t\u1eadp h\u1ee3p A g\u1ed3m c\u00e1c s\u1ed1 c\u00f3 hai ch\u1eef s\u1ed1 m\u00e0 ch\u1eef s\u1ed1 h\u00e0ng ch\u1ee5c v\u00e0 ch\u1eef s\u1ed1 h\u00e0ng \u0111\u01a1n v\u1ecb g\u1ea5p k\u00e9m nhau 4 l\u1ea7n<br\/> V\u1eady A ={ _input_; _input_; _input_; _input_ }","hint":"Li\u1ec7t k\u00ea c\u00e1c c\u1eb7p s\u1ed1 g\u1ea5p k\u00e9m nhau 4 l\u1ea7n r\u1ed3i l\u1eadp c\u00e1c s\u1ed1 c\u00f3 hai ch\u1eef s\u1ed1 t\u1eeb c\u00e1c c\u1eb7p s\u1ed1 \u0111\u00f3","explain":"<span class='basic_left'><span class='basic_green'>H\u01b0\u1edbng d\u1eabn:<\/span><br\/> <b> B\u01b0\u1edbc 1: <\/b> Vi\u1ebft c\u00e1c c\u1eb7p s\u1ed1 g\u1ea5p k\u00e9m nhau 4 l\u1ea7n <br\/> <b> B\u01b0\u1edbc 2: <\/b>Vi\u1ebft c\u00e1c s\u1ed1 c\u00f3 hai ch\u1eef s\u1ed1 t\u1eeb c\u00e1c c\u1eb7p s\u1ed1 \u0111\u00f3 <br\/> <\/span><span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span><br\/> Ta c\u00f3: 4 = 4 : 1 = 8 : 2<br\/>N\u00ean ta vi\u1ebft \u0111\u01b0\u1ee3c c\u00e1c s\u1ed1 c\u00f3 hai ch\u1eef s\u1ed1 m\u00e0 ch\u1eef s\u1ed1 h\u00e0ng ch\u1ee5c v\u1edbi ch\u1eef s\u1ed1 h\u00e0ng \u0111\u01a1n v\u1ecb g\u1ea5p k\u00e9m nhau 4 l\u1ea7n l\u00e0: 14; 41; 28; 82 <br\/><span class='basic_pink'>C\u00e1c s\u1ed1 c\u1ea7n \u0111i\u1ec1n l\u00e0: 14; 41; 28; 82<\/span>"}]}],"id_ques":97},{"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":[[["123"]]],"list":[{"point":10,"width":60,"content":"","type_input":"","ques":"H\u00e3y t\u00ecm s\u1ed1 t\u1ef1 nhi\u00ean c\u00f3 3 ch\u1eef s\u1ed1 bi\u1ebft khi vi\u1ebft th\u00eam ch\u1eef s\u1ed1 3 v\u00e0o b\u00ean ph\u1ea3i s\u1ed1 \u0111\u00f3 ta \u0111\u01b0\u1ee3c s\u1ed1 m\u1edbi. Bi\u1ebft t\u1ed5ng c\u1ee7a s\u1ed1 m\u1edbi v\u00e0 s\u1ed1 \u0111\u00e3 cho l\u00e0 1356. <br\/> S\u1ed1 ban \u0111\u1ea7u l\u00e0: _input_","hint":"Khi vi\u1ebft th\u00eam ch\u1eef s\u1ed1 3 v\u00e0o b\u00ean ph\u1ea3i m\u1ed9t s\u1ed1 c\u00f3 3 ch\u1eef s\u1ed1 th\u00ec s\u1ed1 \u0111\u00f3 t\u0103ng 10 l\u1ea7n v\u00e0 3 \u0111\u01a1n v\u1ecb","explain":"<span class='basic_left'><span class='basic_green'>H\u01b0\u1edbng d\u1eabn:<\/span><br\/> <b> B\u01b0\u1edbc 1: <\/b> G\u1ecdi s\u1ed1 c\u00f3 3 ch\u1eef s\u1ed1 \u0111\u00f3 l\u00e0 $\\overline{abc}$<br\/> <b> B\u01b0\u1edbc 2: <\/b>Khi vi\u1ebft th\u00eam ch\u1eef s\u1ed1 3 v\u00e0o b\u00ean ph\u1ea3i ta \u0111\u01b0\u1ee3c s\u1ed1 $\\overline{abc3}$ <br\/> <b> B\u01b0\u1edbc 3: <\/b> T\u00ecm $\\overline{abc}$ <br\/>Theo \u0111\u1ec1 b\u00e0i t\u1ed5ng c\u1ee7a s\u1ed1 m\u1edbi v\u00e0 s\u1ed1 ban \u0111\u1ea7u b\u1eb1ng 1356 n\u00ean ta c\u00f3 $\\overline{abc} + \\overline{abc3} = 1356$ <\/span><br\/> <span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span><br\/> <br\/> G\u1ecdi s\u1ed1 c\u00f3 3 ch\u1eef s\u1ed1 \u0111\u00f3 l\u00e0: $\\overline{abc}$ <br\/> Sau khi vi\u1ebft th\u00eam ch\u1eef s\u1ed1 3 v\u00e0o b\u00ean ph\u1ea3i s\u1ed1 \u0111\u00f3 ta \u0111\u01b0\u1ee3c: $\\overline{abc3}$ <br\/> Theo \u0111\u1ec1 b\u00e0i ta c\u00f3: $$\\overline{abc3} + \\overline{abc} = 1356$$ $$\\overline{abc} . 10 + 3 + \\overline{abc} = 1356$$ $$ 11. \\overline{abc} = 1353$$ $$ \\overline{abc} = 123$$<span class='basic_pink'>V\u1eady s\u1ed1 c\u1ea7n t\u00ecm l\u00e0: 123<\/span>"}]}],"id_ques":98},{"time":24,"part":[{"title":"\u0110i\u1ec1n s\u1ed1 th\u00edch h\u1ee3p v\u00e0o ch\u1ed7 tr\u1ed1ng","title_trans":"","temp":"fill_the_blank_random","correct":[[["1530"],["1503"],["1521"],["1512"]]],"list":[{"point":10,"width":60,"content":"","type_input":"","ques":"H\u00e3y vi\u1ebft t\u1eadp h\u1ee3p A c\u00e1c s\u1ed1 t\u1ef1 nhi\u00ean c\u00f3 s\u1ed1 tr\u0103m l\u00e0 15, t\u1ed5ng ch\u1eef s\u1ed1 h\u00e0ng ch\u1ee5c v\u1edbi ch\u1eef s\u1ed1 h\u00e0ng \u0111\u01a1n v\u1ecb l\u00e0 3 <br\/> A = { _input_; _input_; _input_; _input_}","hint":"C\u00e1c s\u1ed1 c\u1ea7n t\u00ecm c\u00f3 d\u1ea1ng $\\overline{15ab}$ sao cho a + b = 3","explain":"<span class='basic_left'><span class='basic_green'>H\u01b0\u1edbng d\u1eabn:<\/span><br\/> V\u00ec c\u00e1c s\u1ed1 c\u1ea7n t\u00ecm c\u00f3 s\u1ed1 tr\u0103m l\u00e0 15 n\u00ean c\u00f3 d\u1ea1ng $\\overline{15ab}$ <br\/> T\u1ed5ng ch\u1eef s\u1ed1 h\u00e0ng ch\u1ee5c v\u00e0 ch\u1eef s\u1ed1 h\u00e0ng \u0111\u01a1n v\u1ecb l\u00e0 3 n\u00ean: a + b = 3<br\/> <b> B\u01b0\u1edbc 1: <\/b>Vi\u1ebft 3 th\u00e0nh t\u1ed5ng c\u1ee7a hai s\u1ed1 t\u1ef1 nhi\u00ean <br\/> <b> B\u01b0\u1edbc 2: <\/b> Vi\u1ebft c\u00e1c s\u1ed1 t\u1ef1 nhi\u00ean d\u1ea1ng $\\overline{15ab}$ v\u1edbi ch\u1eef s\u1ed1 h\u00e0ng ch\u1ee5c v\u00e0 ch\u1eef s\u1ed1 h\u00e0ng \u0111\u01a1n v\u1ecb l\u00e0 c\u00e1c c\u1eb7p s\u1ed1 v\u1eeba vi\u1ebft \u1edf tr\u00ean <\/span><br\/> <span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span><br\/> <br\/> V\u00ec t\u1eadp h\u1ee3p A g\u1ed3m c\u00e1c s\u1ed1 c\u00f3 s\u1ed1 tr\u0103m l\u00e0 15 n\u00ean t\u1eadp h\u1ee3p A g\u1ed3m c\u00e1c s\u1ed1 d\u1ea1ng $\\overline{15ab}$ <br\/>Ta c\u00f3: 3 = 0 + 3 = 1 + 2 <br\/> V\u1eady A = {1530; 1503; 1521; 1512} <br\/><span class='basic_pink'>C\u00e1c s\u1ed1 c\u1ea7n \u0111i\u1ec1n l\u00e0: 1530; 1503; 1521; 1512<\/span>"}]}],"id_ques":99},{"time":24,"part":[{"title":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","title_trans":"","temp":"multiple_choice","correct":[[3]],"list":[{"point":10,"ques":"S\u1ed1 CDXCV trong h\u1ec7 La M\u00e3 c\u00f3 gi\u00e1 tr\u1ecb b\u1eb1ng s\u1ed1 t\u1ef1 nhi\u00ean n\u00e0o sau \u0111\u00e2y: ","select":["A. 515 ","B. 615 ","C. 495 ","D. 695"],"hint":"Trong h\u1ec7 La M\u00e3 D l\u00e0 500, C l\u00e0 100, V l\u00e0 5, CD l\u00e0 400, XC l\u00e0 90","explain":"<span class='basic_left'><span class='basic_green'>H\u01b0\u1edbng d\u1eabn: <\/span> <br\/>\u0110\u1ec3 \u0111\u1ecdc \u0111\u01b0\u1ee3c s\u1ed1 La M\u00e3 ta c\u1ed9ng c\u00e1c gi\u00e1 tr\u1ecb c\u1ee7a c\u00e1c ch\u1eef s\u1ed1 La M\u00e3 trong s\u1ed1 \u0111\u00f3 <br\/> L\u01b0u \u00fd c\u00e1c s\u1ed1 La M\u00e3 \u0111\u1eb7c bi\u1ec7t: IV l\u00e0 4, IX l\u00e0 9; XL l\u00e0 40; XC l\u00e0 90, CD l\u00e0 400, CM l\u00e0 900<br\/> <br\/><\/span><span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span> <br\/> <br\/> Gi\u00e1 tr\u1ecb c\u00e1c ch\u1eef s\u1ed1 trong s\u1ed1 CDXCV l\u00e0: <br\/> CD = 400; XC = 90, V l\u00e0 5 <br\/> V\u1eady s\u1ed1 CDXCV = 400 + 90 + 5 = 495<br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0: C. 495<\/span>","column":2}]}],"id_ques":100}],"lesson":{"save":0,"level":3}}