{"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":"Cho a = 9475; b = 5832; c = 525 <br\/> T\u00ednh a + b + c = ?","select":["A. 15832 ","B. 15932 ","C. 15831 ","D. 15931 "],"hint":"T\u00ednh 9475 + 5832 + 525 = ?","explain":"<span class='basic_left'><span class='basic_green'>H\u01b0\u1edbng d\u1eabn: <br\/> <\/span>T\u00ednh 9475 + 5832 + 525 = ? <br\/><\/span><span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span> <br\/> <br\/>Ta c\u00f3: $$\\begin{align*}a + b + c &= 9475 + 5832 + 525 \\\\&= (9475 + 525) + 5832 \\\\& = 10 000 + 5832 \\\\& = 15832\\end{align*}$$<span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0: A<\/span>","column":2}]}],"id_ques":151},{"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":"Cho a = 3815; b = 8324; c = 5676 <br\/> T\u00ednh a + b + c = ?","select":["A. 19715 ","B. 17715 ","C. 17815 ","D. 18715 "],"hint":"T\u00ednh 3815 + 8324 + 5676 = ?","explain":"<span class='basic_left'><span class='basic_green'>H\u01b0\u1edbng d\u1eabn: <br\/> <\/span> T\u00ednh 3815 + 8324 + 5676 = ? <br\/><\/span><span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span> <br\/> <br\/>Ta c\u00f3: $$\\begin{align*}a + b + c &= 3815 + 8324 + 5676 \\\\&= 3815 + (8324 + 5676) \\\\& = 3815 + 14000 \\\\& = 17815\\end{align*}$$ <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0: C<\/span>","column":2}]}],"id_ques":152},{"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":"T\u00ednh 38.(47 + 95)","select":["A. 5396 ","B. 5496 ","C. 5369 ","D. 5395 "],"hint":"","explain":"<span class='basic_left'><span class='basic_green'>H\u01b0\u1edbng d\u1eabn: <\/span> <br\/> T\u00ednh trong ngo\u1eb7c tr\u01b0\u1edbc r\u1ed3i nh\u00e2n v\u1edbi s\u1ed1 ngo\u00e0i ngo\u1eb7c sau<br\/> <br\/><\/span><span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span> $$\\begin{align*}38. (47 + 95) &= 38 . 142 \\\\&= 5396\\end{align*}$$ <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0: A<\/span>","column":2}]}],"id_ques":153},{"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":"T\u00ednh 93. (18 + 57)","select":["A. 6976 ","B. 6975 ","C. 6957 ","D. 6875 "],"hint":"","explain":"<span class='basic_left'><span class='basic_green'>H\u01b0\u1edbng d\u1eabn: <\/span> <br\/> T\u00ednh trong ngo\u1eb7c tr\u01b0\u1edbc r\u1ed3i nh\u00e2n v\u1edbi s\u1ed1 ngo\u00e0i ngo\u1eb7c sau<br\/> <br\/><\/span><span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span> $$\\begin{align*}93. (18 + 57) &= 93 . 75 \\\\&= 6975\\end{align*}$$ <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0: B<\/span>","column":2}]}],"id_ques":154},{"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":"T\u00ecm x bi\u1ebft: <br\/> (x - 34). 15 = 0","select":["A. x = 510 ","B. x = 34 ","C. x = 35 ","D. x = 150 "],"hint":"T\u00ecm x th\u1ecfa m\u00e3n x - 34 = 0","explain":"<span class='basic_left'><span class='basic_green'>H\u01b0\u1edbng d\u1eabn: <\/span> <br\/> V\u00ec (x - 34). 15 = 0 <br\/> Suy ra x - 34 = 0 <br\/> Ta t\u00ecm x th\u1ecfa m\u00e3n x - 34 = 0<br\/> <br\/><\/span><span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span> <br\/> <br\/> $\\begin{align*}(x - 34). 15 &= 0 \\\\ x - 34 &= 0 \\\\ x &= 34\\end{align*}$ <br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0: B <\/span>","column":2}]}],"id_ques":155},{"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":"T\u00ecm x bi\u1ebft: <br\/> (x - 35). 42 - 84 = 0","select":["A. x = 37 ","B. x = 35 ","C. x = 36 ","D. x = 34 "],"hint":"\u00c1p d\u1ee5ng t\u00ednh ch\u1ea5t a.(b + c) = a.b + a.c","explain":"<span class='basic_left'><span class='basic_green'>H\u01b0\u1edbng d\u1eabn: <\/span> <br\/> \u00c1p \u0111\u1ee5ng t\u00ednh ch\u1ea5t a.(b + c) = a.b + a.c \u0111\u1ec3 ph\u00e1 ngo\u1eb7c r\u1ed3i t\u00ecm x<br\/> <br\/><\/span><span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span> <br\/> <br\/> $\\begin{align*}(x - 35). 42 - 84 &= 0 \\\\ x.42 - 35.42 - 84 &= 0 \\\\ x.42 - 35.42 &= 84 \\\\ x.42 &= 84 + 1470 \\\\ x.42 &= 1554 \\\\ x &= 37\\end{align*}$ <br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0: A <\/span>","column":2}]}],"id_ques":156},{"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":[[["255"],["8066"]]],"list":[{"point":5,"width":50,"type_input":"","ques":"H\u00e3y \u0111i\u1ec1n s\u1ed1 th\u00edch h\u1ee3p v\u00e0o \u00f4 tr\u1ed1ng: <br\/> <table><tr><th>a<br><\/th><th>218<\/th><\/tr><tr><td>b<\/td><td>37<\/td><\/tr><tr><td>a +b<br><\/td><td>_input_<\/td><\/tr><tr><td>a.b<br><\/td><td>_input_<\/td><\/tr><\/table>","hint":"T\u00ednh 218 + 37 = ? v\u00e0 218.37 = ?","explain":"<span class='basic_left'><span class='basic_green'>H\u01b0\u1edbng d\u1eabn:<\/span><br\/><b>B\u01b0\u1edbc 1: <\/b>T\u00ednh 218 + 37 = ? <br\/> <b> B\u01b0\u1edbc 2: <\/b> T\u00ednh 218.37 = ?<\/span> <br\/><br\/> <span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span><br\/> Ta c\u00f3: 218+37 = 255 <br\/> 218.37 = 8066 <br\/> V\u1eady c\u00e1c s\u1ed1 c\u1ea7n \u0111i\u1ec1n l\u00e0: <br\/> <table><tr><th>a<br><\/th><th>218<\/th><\/tr><tr><td>b<\/td><td>37<\/td><\/tr><tr><td>a +b<br><\/td><td>255<\/td><\/tr><tr><td>a.b<br><\/td><td>8066<\/td><\/tr><\/table>"}]}],"id_ques":157},{"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":[[["553"],["57270"]]],"list":[{"point":5,"width":50,"type_input":"","ques":"H\u00e3y \u0111i\u1ec1n s\u1ed1 th\u00edch h\u1ee3p v\u00e0o \u00f4 tr\u1ed1ng: <br\/> <table><tr><th>a<br><\/th><th>415<\/th><\/tr><tr><td>b<\/td><td>138<\/td><\/tr><tr><td>a +b<br><\/td><td>_input_<\/td><\/tr><tr><td>a.b<br><\/td><td>_input_<\/td><\/tr><\/table>","hint":"T\u00ednh 415 + 138 = ? v\u00e0 415.138= ?","explain":"<span class='basic_left'><span class='basic_green'>H\u01b0\u1edbng d\u1eabn:<\/span><br\/><b>B\u01b0\u1edbc 1: <\/b>T\u00ednh 415+138 = ? <br\/> <b> B\u01b0\u1edbc 2: <\/b> T\u00ednh 415.138 = ?<\/span> <br\/><br\/> <span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span><br\/> Ta c\u00f3: 415+138 = 553 <br\/> 415.138 = 57270 <br\/> V\u1eady c\u00e1c s\u1ed1 c\u1ea7n \u0111i\u1ec1n l\u00e0: <br\/> <table><tr><th>a<br><\/th><th>415<\/th><\/tr><tr><td>b<\/td><td>138<\/td><\/tr><tr><td>a +b<br><\/td><td>553<\/td><\/tr><tr><td>a.b<br><\/td><td>57270<\/td><\/tr><\/table>"}]}],"id_ques":158},{"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":"Khi \u0111\u1ed5i ch\u1ed7 c\u00e1c s\u1ed1 h\u1ea1ng trong 1 t\u1ed5ng th\u00ec t\u1ed5ng kh\u00f4ng thay \u0111\u1ed5i. \u0110\u00f3 l\u00e0 t\u00ednh ch\u1ea5t n\u00e0o c\u1ee7a ph\u00e9p c\u1ed9ng c\u00e1c s\u1ed1 t\u1ef1 nhi\u00ean?","select":["A. T\u00ednh ch\u1ea5t giao ho\u00e1n ","B. T\u00ednh ch\u1ea5t k\u1ebft h\u1ee3p ","C. T\u00ednh ch\u1ea5t ph\u00e2n ph\u1ed1i c\u1ee7a ph\u00e9p nh\u00e2n \u0111\u1ed1i v\u1edbi ph\u00e9p c\u1ed9ng "],"hint":"","explain":"<span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span> <br\/> <br\/> Khi \u0111\u1ed5i ch\u1ed7 c\u00e1c s\u1ed1 h\u1ea1ng trong 1 t\u1ed5ng th\u00ec t\u1ed5ng kh\u00f4ng thay \u0111\u1ed5i <br\/> Hay ch\u00ednh l\u00e0: a + b = b + a <br\/> \u0110\u00e2y l\u00e0 <b> t\u00ednh ch\u1ea5t giao ho\u00e1n <\/b> c\u1ee7a ph\u00e9p c\u1ed9ng c\u00e1c s\u1ed1 t\u1ef1 nhi\u00ean <br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0: A <\/span>","column":1}]}],"id_ques":159},{"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":"Mu\u1ed1n c\u1ed9ng m\u1ed9t t\u1ed5ng hai s\u1ed1 v\u1edbi m\u1ed9t s\u1ed1 th\u1ee9 3 ta c\u00f3 th\u1ec3 c\u1ed9ng s\u1ed1 th\u1ee9 nh\u1ea5t v\u1edbi t\u1ed5ng c\u1ee7a s\u1ed1 th\u1ee9 hai v\u00e0 s\u1ed1 th\u1ee9 ba. \u0110\u00f3 l\u00e0 t\u00ednh ch\u1ea5t n\u00e0o c\u1ee7a ph\u00e9p c\u1ed9ng c\u00e1c s\u1ed1 t\u1ef1 nhi\u00ean","select":["A. T\u00ednh ch\u1ea5t giao ho\u00e1n ","B. T\u00ednh ch\u1ea5t k\u1ebft h\u1ee3p ","C. T\u00ednh ch\u1ea5t ph\u00e2n ph\u1ed1i c\u1ee7a ph\u00e9p nh\u00e2n \u0111\u1ed1i v\u1edbi ph\u00e9p c\u1ed9ng "],"hint":"","explain":"<span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span> <br\/> <br\/> Mu\u1ed1n c\u1ed9ng m\u1ed9t t\u1ed5ng hai s\u1ed1 v\u1edbi m\u1ed9t s\u1ed1 th\u1ee9 3 ta c\u00f3 th\u1ec3 c\u1ed9ng s\u1ed1 th\u1ee9 nh\u1ea5t v\u1edbi t\u1ed5ng c\u1ee7a s\u1ed1 th\u1ee9 hai v\u00e0 s\u1ed1 th\u1ee9 ba <br\/>Hay ch\u00ednh l\u00e0: (a + b) + c = a + (b + c) <br\/> \u0110\u00e2y l\u00e0 <b> t\u00ednh ch\u1ea5t k\u1ebft h\u1ee3p <\/b>c\u1ee7a ph\u00e9p c\u1ed9ng c\u00e1c s\u1ed1 t\u1ef1 nhi\u00ean <br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0: B <\/span>","column":1}]}],"id_ques":160},{"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":[[["118"]]],"list":[{"point":5,"width":50,"type_input":"","ques":"T\u00ednh nhanh: <br\/> 35 + 18 + 65 = _input_","hint":"\u00c1p d\u1ee5ng t\u00ednh ch\u1ea5t giao ho\u00e1n v\u00e0 t\u00ednh ch\u1ea5t k\u1ebft h\u1ee3p c\u1ee7a ph\u00e9p c\u1ed9ng","explain":"<span class='basic_left'><span class='basic_green'>H\u01b0\u1edbng d\u1eabn:<\/span><br\/>\u00c1p d\u1ee5ng t\u00ednh ch\u1ea5t giao ho\u00e1n c\u1ee7a ph\u00e9p c\u1ed9ng \u0111\u1ec3 \u0111\u1ed5i ch\u1ed7 c\u00e1c s\u1ed1 h\u1ea1ng <br\/> \u00c1p d\u1ee5ng t\u00ednh ch\u1ea5t k\u1ebft h\u1ee3p \u0111\u1ec3 nh\u00f3m c\u00e1c s\u1ed1 h\u1ea1ng c\u00f3 t\u1ed5ng tr\u00f2n ch\u1ee5c ho\u1eb7c tr\u00f2n tr\u0103m<\/span> <br\/><br\/> <span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span><br\/> Ta c\u00f3: $$\\begin{align*}& 35 + 18 + 65 \\\\ =& 35 + 65 + 18 \\\\ =& (35 + 65) + 18 \\\\ =& 100 + 18 \\\\ =& 118 \\end{align*}$$ <span class='basic_pink'>V\u1eady s\u1ed1 c\u1ea7n \u0111i\u1ec1n l\u00e0: 118"}]}],"id_ques":161},{"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":[[["137"]]],"list":[{"point":5,"width":50,"type_input":"","ques":"T\u00ednh nhanh: <br\/> 49 + 37 + 51 = _input_","hint":"\u00c1p d\u1ee5ng t\u00ednh ch\u1ea5t giao ho\u00e1n v\u00e0 t\u00ednh ch\u1ea5t k\u1ebft h\u1ee3p c\u1ee7a ph\u00e9p c\u1ed9ng","explain":"<span class='basic_left'><span class='basic_green'>H\u01b0\u1edbng d\u1eabn:<\/span><br\/>\u00c1p d\u1ee5ng t\u00ednh ch\u1ea5t giao ho\u00e1n c\u1ee7a ph\u00e9p c\u1ed9ng \u0111\u1ec3 \u0111\u1ed5i ch\u1ed7 c\u00e1c s\u1ed1 h\u1ea1ng <br\/> \u00c1p d\u1ee5ng t\u00ednh ch\u1ea5t k\u1ebft h\u1ee3p ta nh\u00f3m c\u00e1c s\u1ed1 h\u1ea1ng c\u00f3 t\u1ed5ng tr\u00f2n ch\u1ee5c ho\u1eb7c tr\u00f2n tr\u0103m<\/span> <br\/><br\/> <span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span><br\/> Ta c\u00f3: $$\\begin{align*}& 49 + 37 + 51 \\\\ =& 49 + 51 + 37 \\\\ =& (49 + 51) + 37 \\\\ =& 100 + 37 \\\\ =& 137 \\end{align*}$$ <span class='basic_pink'>V\u1eady s\u1ed1 c\u1ea7n \u0111i\u1ec1n l\u00e0: 137<\/span>"}]}],"id_ques":162},{"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":"H\u00e3y ch\u1ecdn \u0111\u00e1p \u00e1n n\u00e0o \u0111\u01b0\u1ee3c t\u00ednh b\u1eb1ng c\u00e1ch h\u1ee3p l\u00fd?","select":["A. 72 + 69 + 128 = (72 + 128) + 69","B. 72 + 69 + 128 = (72 + 69) + 128 ","C. 72 + 69 + 128 = 72 + (69 + 128)"],"hint":"\u00c1p d\u1ee5ng t\u00ednh ch\u1ea5t giao ho\u00e1n v\u00e0 k\u1ebft h\u1ee3p c\u1ee7a ph\u00e9p c\u1ed9ng","explain":"<span class='basic_left'><span class='basic_green'>H\u01b0\u1edbng d\u1eabn: <\/span> <br\/> \u00c1p d\u1ee5ng t\u00ednh ch\u1ea5t giao ho\u00e1n \u0111\u1ec3 \u0111\u1ed5i ch\u1ed7 c\u00e1c s\u1ed1 h\u1ea1ng <br\/> \u00c1p d\u1ee5ng t\u00ednh ch\u1ea5t k\u1ebft h\u1ee3p \u0111\u1ec3 nh\u00f3m c\u00e1c s\u1ed1 h\u1ea1ng m\u00e0 khi c\u1ed9ng l\u1ea1i \u0111\u01b0\u1ee3c k\u1ebft qu\u1ea3 tr\u00f2n ch\u1ee5c hay tr\u00f2n tr\u0103m<br\/> <br\/><\/span><span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span> <br\/> <br\/> 72 + 69 + 128 ta th\u1ea5y 72 + 128 = 200 n\u00ean ta nh\u00f3m 72 v\u00e0 128 l\u1ea1i <br\/> $\\begin{align*}& 72 + 69 + 128 \\\\ =& 72 + 128 + 69 \\\\ =& (72 + 128) + 69 \\\\ =& 200 + 69 \\\\ =& 269 \\end{align*}$ <br\/> V\u1eady c\u00e1ch t\u00ednh h\u1ee3p l\u00fd l\u00e0 ta t\u00ednh t\u1ed5ng c\u1ee7a 72 v\u00e0 128 r\u1ed3i c\u1ed9ng ti\u1ebfp v\u1edbi 69 <br\/><span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0: A <\/span>","column":1}]}],"id_ques":163},{"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":"H\u00e3y ch\u1ecdn \u0111\u00e1p \u00e1n n\u00e0o \u0111\u01b0\u1ee3c t\u00ednh b\u1eb1ng c\u00e1ch h\u1ee3p l\u00fd?","select":["A. 32.47 + 32.5 = 1504 + 1696 ","B. 32.47 + 32.53 = 32.(47 + 53) ","C. 32.47 + 32.53 = 32.47.53 "],"hint":"\u00c1p d\u1ee5ng t\u00ednh ch\u1ea5t ph\u00e2n ph\u1ed1i c\u1ee7a ph\u00e9p nh\u00e2n \u0111\u1ed1i v\u1edbi ph\u00e9p c\u1ed9ng","explain":"<span class='basic_left'><span class='basic_green'>H\u01b0\u1edbng d\u1eabn: <\/span> <br\/> \u00c1p d\u1ee5ng t\u00ednh ch\u1ea5t ph\u00e2n ph\u1ed1i c\u1ee7a ph\u00e9p nh\u00e2n \u0111\u1ed1i v\u1edbi ph\u00e9p c\u1ed9ng <br\/> C\u00e1ch t\u00ednh h\u1ee3p l\u00fd l\u00e0 nh\u00f3m th\u1eeba s\u1ed1 gi\u1ed1ng nhau \u1edf hai t\u00edch<br\/> <br\/><\/span><span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span> <br\/> <br\/> 32.47 + 32.53 ta th\u1ea5y \u1edf c\u1ea3 hai t\u00edch trong t\u1ed5ng \u0111\u1ec1u c\u00f3 th\u1eeba s\u1ed1 32 n\u00ean c\u00e1ch t\u00ednh h\u1ee3p l\u00fd l\u00e0 ta nh\u00f3m 32 ra ngo\u00e0i <br\/> $\\begin{align*}& 32.47 + 32.53 \\\\ =& 32.(47 + 53) \\\\ =& 32.100 \\\\ =& 3200 \\end{align*}$ <br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0: B <\/span>","column":1}]}],"id_ques":164},{"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":[[["586412"]]],"list":[{"point":5,"width":80,"type_input":"","ques":"H\u00e3y \u0111i\u1ec1n s\u1ed1 th\u00edch h\u1ee3p v\u00e0o \u00f4 tr\u1ed1ng: <br\/> 94135 + 586412 = _input_ + 94135","hint":"\u00c1p d\u1ee5ng t\u00ednh ch\u1ea5t giao ho\u00e1n c\u1ee7a ph\u00e9p c\u1ed9ng","explain":"<span class='basic_left'><span class='basic_green'>H\u01b0\u1edbng d\u1eabn:<\/span><br\/>\u00c1p d\u1ee5ng t\u00ednh ch\u1ea5t giao ho\u00e1n c\u1ee7a ph\u00e9p c\u1ed9ng<\/span> <br\/><br\/> <span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span><br\/> Ta c\u00f3: <br\/> VT: 94135 + 586412 <br\/> VP: ? + 94135 <br\/> Ta th\u1ea5y c\u1ea3 hai v\u1ebf \u0111\u1ec1u c\u00f3 s\u1ed1 h\u1ea1ng 94135 <br\/> Theo t\u00ednh ch\u1ea5t giao ho\u00e1n c\u1ee7a ph\u00e9p c\u1ed9ng: a + b = b + a <br\/> N\u00ean 94135 + 586412 = <b>586412<\/b> + 94135 <br\/> <span class='basic_pink'>V\u1eady s\u1ed1 c\u1ea7n \u0111i\u1ec1n l\u00e0: 586412<\/span>"}]}],"id_ques":165},{"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":[[["850916"]]],"list":[{"point":5,"width":80,"type_input":"","ques":"H\u00e3y \u0111i\u1ec1n s\u1ed1 th\u00edch h\u1ee3p v\u00e0o \u00f4 tr\u1ed1ng: <br\/> 850916 + 571392 = 571392 + _input_ ","hint":"\u00c1p d\u1ee5ng t\u00ednh ch\u1ea5t giao ho\u00e1n c\u1ee7a ph\u00e9p c\u1ed9ng","explain":"<span class='basic_left'><span class='basic_green'>H\u01b0\u1edbng d\u1eabn:<\/span><br\/>\u00c1p d\u1ee5ng t\u00ednh ch\u1ea5t giao ho\u00e1n c\u1ee7a ph\u00e9p c\u1ed9ng<\/span> <br\/><br\/> <span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span><br\/> Ta c\u00f3: <br\/> VT: 850916 + 571392 <br\/> VP: 571392 + ? <br\/> Ta th\u1ea5y c\u1ea3 hai v\u1ebf \u0111\u1ec1u c\u00f3 s\u1ed1 h\u1ea1ng 571392 <br\/> Theo t\u00ednh ch\u1ea5t giao ho\u00e1n c\u1ee7a ph\u00e9p c\u1ed9ng: a + b = b + a <br\/> N\u00ean 850916 + 571392 = 571392 + <b> 850916 <\/b> <br\/> <span class='basic_pink'>V\u1eady s\u1ed1 c\u1ea7n \u0111i\u1ec1n l\u00e0: 850916<\/span>"}]}],"id_ques":166},{"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":[[["58047"]]],"list":[{"point":5,"width":80,"type_input":"","ques":"H\u00e3y \u0111i\u1ec1n s\u1ed1 th\u00edch h\u1ee3p v\u00e0o \u00f4 tr\u1ed1ng: <br\/> (8159 + 91453) + 58047 = 8159 + (91453 + _input_) ","hint":"\u00c1p d\u1ee5ng t\u00ednh ch\u1ea5t k\u1ebft h\u1ee3p c\u1ee7a ph\u00e9p c\u1ed9ng","explain":"<span class='basic_left'><span class='basic_green'>H\u01b0\u1edbng d\u1eabn:<\/span><br\/>\u00c1p d\u1ee5ng t\u00ednh ch\u1ea5t k\u1ebft h\u1ee3p c\u1ee7a ph\u00e9p c\u1ed9ng<\/span> <br\/><br\/> <span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span><br\/> Ta c\u00f3: <br\/> VT: (8159 + 91453) + 58047 <br\/> VP: 8159 + (91453 + ?) <br\/> Ta th\u1ea5y c\u1ea3 hai v\u1ebf \u0111\u1ec1u c\u00f3 s\u1ed1 h\u1ea1ng 8159 v\u00e0 94153 <br\/> Theo t\u00ednh ch\u1ea5t k\u1ebft h\u1ee3p c\u1ee7a ph\u00e9p c\u1ed9ng: (a + b) + c = a + (b + c) <br\/> N\u00ean (8159 + 91453) + 58047 = 8159 + (91453 + <b>58047<\/b>) <br\/> <span class='basic_pink'>V\u1eady s\u1ed1 c\u1ea7n \u0111i\u1ec1n l\u00e0: 58047<\/span>"}]}],"id_ques":167},{"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":[[["8764"]]],"list":[{"point":5,"width":80,"type_input":"","ques":"H\u00e3y \u0111i\u1ec1n s\u1ed1 th\u00edch h\u1ee3p v\u00e0o \u00f4 tr\u1ed1ng: <br\/> 9036 + (8764 + 5934) =(9036 + _input_) + 5934 ","hint":"\u00c1p d\u1ee5ng t\u00ednh ch\u1ea5t k\u1ebft h\u1ee3p c\u1ee7a ph\u00e9p c\u1ed9ng","explain":"<span class='basic_left'><span class='basic_green'>H\u01b0\u1edbng d\u1eabn:<\/span><br\/>\u00c1p d\u1ee5ng t\u00ednh ch\u1ea5t k\u1ebft h\u1ee3p c\u1ee7a ph\u00e9p c\u1ed9ng<\/span> <br\/><br\/> <span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span><br\/> Ta c\u00f3: <br\/> VT: 9036 + (8764 + 5934) <br\/> VP: (9036 + ?) + 5934 <br\/> Ta th\u1ea5y c\u1ea3 hai v\u1ebf \u0111\u1ec1u c\u00f3 s\u1ed1 h\u1ea1ng 9036 v\u00e0 5934 <br\/> Theo t\u00ednh ch\u1ea5t k\u1ebft h\u1ee3p c\u1ee7a ph\u00e9p c\u1ed9ng: (a + b) + c = a + (b + c) <br\/> N\u00ean 9036 + (8764 + 5934) =(9036 + <b>8764<\/b>) + 5934 <br\/> <span class='basic_pink'>V\u1eady s\u1ed1 c\u1ea7n \u0111i\u1ec1n l\u00e0: 8764<\/span>"}]}],"id_ques":168},{"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":"Cho bi\u1ec3u th\u1ee9c: 953871 + 913802 <br\/> Bi\u1ec3u th\u1ee9c n\u00e0o sau \u0111\u00e2y c\u00f3 gi\u00e1 tr\u1ecb b\u1eb1ng bi\u1ec3u th\u1ee9c \u0111\u00e3 cho?","select":["A. 913802 + 953875 ","B. 913802 + 953871 ","C. 953871 + 598371 "],"hint":"\u00c1p d\u1ee5ng t\u00ednh ch\u1ea5t giao ho\u00e1n c\u1ee7a ph\u00e9p c\u1ed9ng","explain":"<span class='basic_left'><span class='basic_green'>H\u01b0\u1edbng d\u1eabn: <\/span> <br\/> \u00c1p d\u1ee5ng t\u00ednh ch\u1ea5t giao ho\u00e1n c\u1ee7a ph\u00e9p c\u1ed9ng <br\/> X\u00e9t t\u1eebng t\u1ed5ng xem t\u1ed5ng n\u00e0o c\u00f3 gi\u00e1 tr\u1ecb b\u1eb1ng t\u1ed5ng \u0111\u00e3 cho<br\/> <br\/><\/span><span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span> <br\/> <br\/> A - Ta c\u00f3 v\u00ec 953875 > 953871 v\u00e0 913802 = 913802 <br\/>N\u00ean <b> 953871 + 913802 < 913802 + 953875 <\/b> <br\/> B - V\u00ec 913802 = 913802; 953871 = 953871 <br\/> N\u00ean <b> 953871 + 913802 = 913802 + 953871 <\/b> <br\/> C - V\u00ec 953871 = 953871; 913802 > 598371 <br\/> N\u00ean <b> 953871 + 913802 > 953871 + 598371 <\/b> <br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0: B <\/span>","column":3}]}],"id_ques":169},{"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":"Cho bi\u1ec3u th\u1ee9c: 475.387 <br\/> Bi\u1ec3u th\u1ee9c n\u00e0o sau \u0111\u00e2y c\u00f3 gi\u00e1 tr\u1ecb b\u1eb1ng bi\u1ec3u th\u1ee9c \u0111\u00e3 cho?","select":["A. 583.225 ","B. 378.475 ","C. 387.475 "],"hint":"\u00c1p d\u1ee5ng t\u00ednh ch\u1ea5t giao ho\u00e1n c\u1ee7a ph\u00e9p nh\u00e2n","explain":"<span class='basic_left'><span class='basic_green'>H\u01b0\u1edbng d\u1eabn: <\/span> <br\/> \u00c1p d\u1ee5ng t\u00ednh ch\u1ea5t giao ho\u00e1n c\u1ee7a ph\u00e9p nh\u00e2n <br\/> X\u00e9t t\u1eebng t\u00edch xem t\u00edch n\u00e0o c\u00f3 gi\u00e1 tr\u1ecb b\u1eb1ng t\u00edch \u0111\u00e3 cho<br\/> <br\/><\/span><span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span> <br\/> <br\/> A - Ta c\u00f3 v\u00ec 583.225 = 131175; 475.387 = 183825 m\u00e0 183825 > 131175 <br\/>N\u00ean <b> 475.387 > 583. 225 <\/b> <br\/> B - V\u00ec 475 = 475; 378 < 387 <br\/> N\u00ean <b> 475.387 > 378.475<\/b> <br\/> C - V\u00ec 387 = 387; 475 = 475 <br\/> N\u00ean <b> 475.387 = 387.475 <\/b> <br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0: C <\/span>","column":3}]}],"id_ques":170}],"lesson":{"save":0,"level":1}}