{"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":" <center><img src='https://www.luyenthi123.com/file/luyenthi123/lop7/toan/daiso/bai4/lv1/img\/6.jpg' \/><\/center> N\u1ebfu $ x > 0 $ th\u00ec $ \\mid x \\mid $ b\u1eb1ng : ","select":["A. $ x $","B. $ -x $","C. $ 0 $ "],"explain":" <span class='basic_left'><span class='basic_green'>H\u01b0\u1edbng d\u1eabn:<\/span><br\/> <i> Gi\u00e1 tr\u1ecb tuy\u1ec7t \u0111\u1ed1i <\/i> c\u1ee7a s\u1ed1 h\u1eefu t\u1ec9 $x$, k\u00ed hi\u1ec7u $ \\mid x \\mid $ l\u00e0 kho\u1ea3ng c\u00e1ch t\u1eeb \u0111i\u1ec3m $x$ t\u1edbi \u0111i\u1ec3m $0$ tr\u00ean tr\u1ee5c s\u1ed1. <br\/> Ta c\u00f3: $ \\mid x \\mid = \\begin{cases} x \\text { n\u1ebfu } x \\geq 0 \\\\ -x \\text { n\u1ebfu } x < 0. \\end{cases} $ <\/span> <br\/><br\/><span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span><br\/> <br\/> Ta c\u00f3: $ \\mid x \\mid = \\begin{cases} x \\text { n\u1ebfu } x \\geq 0 \\\\ -x \\text { n\u1ebfu } x < 0. \\end{cases} $ <br\/> V\u1eady v\u1edbi $ x > 0 $ th\u00ec $ \\mid x \\mid = x $ <br\/> <br\/> <span class='basic_pink'> \u0110\u00e1p \u00e1n \u0111\u00fang l\u00e0 A.<\/span><\/span> <br\/>","column":3}]}],"id_ques":151},{"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/lop7/toan/daiso/bai4/lv1/img\/6.jpg' \/><\/center> N\u1ebfu $ x < 0 $ th\u00ec $ \\mid x \\mid $ b\u1eb1ng : ","select":["A. $ x $","B. $ -x $","C. $ 0 $ "],"explain":" <span class='basic_left'><span class='basic_green'>H\u01b0\u1edbng d\u1eabn:<\/span><br\/> <i> Gi\u00e1 tr\u1ecb tuy\u1ec7t \u0111\u1ed1i <\/i> c\u1ee7a s\u1ed1 h\u1eefu t\u1ec9 $x$, k\u00ed hi\u1ec7u $ \\mid x \\mid $ l\u00e0 kho\u1ea3ng c\u00e1ch t\u1eeb \u0111i\u1ec3m $x$ t\u1edbi \u0111i\u1ec3m $0$ tr\u00ean tr\u1ee5c s\u1ed1. <br\/> Ta c\u00f3: $ \\mid x \\mid = \\begin{cases} x \\text { n\u1ebfu } x \\geq 0 \\\\ -x \\text { n\u1ebfu } x < 0. \\end{cases} $ <\/span> <br\/><br\/><span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span><br\/> <br\/> Ta c\u00f3: $ \\mid x \\mid = \\begin{cases} x \\text { n\u1ebfu } x \\geq 0 \\\\ -x \\text { n\u1ebfu } x < 0. \\end{cases} $ <br\/> V\u1eady v\u1edbi $ x < 0 $ th\u00ec $ \\mid x \\mid = -x $ <br\/> <br\/> <span class='basic_pink'> \u0110\u00e1p \u00e1n \u0111\u00fang l\u00e0 B.<\/span><\/span> <br\/>","column":3}]}],"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":" <center><img src='https://www.luyenthi123.com/file/luyenthi123/lop7/toan/daiso/bai4/lv1/img\/6.jpg' \/><\/center> V\u1edbi m\u1ecdi $ x \\in \\mathbb{Q}$ ta lu\u00f4n c\u00f3: $ \\mid x \\mid \\geq x $ \u0111\u00fang hay sai? ","select":["A. \u0110\u00fang ","B. Sai "],"explain":" <span class='basic_left'><span class='basic_green'>H\u01b0\u1edbng d\u1eabn:<\/span><br\/> <i> Gi\u00e1 tr\u1ecb tuy\u1ec7t \u0111\u1ed1i <\/i> c\u1ee7a s\u1ed1 h\u1eefu t\u1ec9 $x$, k\u00ed hi\u1ec7u $ \\mid x \\mid $ l\u00e0 kho\u1ea3ng c\u00e1ch t\u1eeb \u0111i\u1ec3m $x$ t\u1edbi \u0111i\u1ec3m $0$ tr\u00ean tr\u1ee5c s\u1ed1. <br\/> V\u1edbi m\u1ecdi $ x \\in \\mathbb{Q}$ ta lu\u00f4n c\u00f3: <br\/> $ \\quad \\mid x \\mid \\geq 0; \\mid x \\mid = \\mid -x \\mid; \\mid x \\mid \\geq x. $ <br\/><br\/><span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span><br\/> V\u1edbi $ x < 0 $ th\u00ec $ \\mid x \\mid = -x > 0.$ Suy ra $ \\mid x \\mid > x$ <br\/> V\u1edbi $ x > 0 $ th\u00ec $ \\mid x \\mid = x > 0.$ Suy ra $ \\mid x \\mid = x$ <br\/> Suy ra, v\u1edbi m\u1ecdi $ x \\in \\mathbb{Q}$ ta lu\u00f4n c\u00f3: $ \\mid x \\mid \\geq x $ <br\/> <br\/> <span class='basic_pink'> \u0110\u00e1p \u00e1n \u0111\u00fang l\u00e0 A.<\/span><\/span> <br\/>","column":2}]}],"id_ques":153},{"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":[[["2,8"]]],"list":[{"point":5,"width":50,"content":"","type_input":"","ques":" <center><img src='https://www.luyenthi123.com/file/luyenthi123/lop7/toan/daiso/bai4/lv1/img\/6.jpg' \/><\/center> N\u1ebfu $ x = 2,8 $ th\u00ec $ \\mid x \\mid $= _input_","explain":" <span class='basic_left'><span class='basic_green'>H\u01b0\u1edbng d\u1eabn:<\/span><br\/> <i> Gi\u00e1 tr\u1ecb tuy\u1ec7t \u0111\u1ed1i <\/i> c\u1ee7a s\u1ed1 h\u1eefu t\u1ec9 $x$, k\u00ed hi\u1ec7u $ \\mid x \\mid $ l\u00e0 kho\u1ea3ng c\u00e1ch t\u1eeb \u0111i\u1ec3m $x$ t\u1edbi \u0111i\u1ec3m $0$ tr\u00ean tr\u1ee5c s\u1ed1. <br\/> Ta c\u00f3: $ \\mid x \\mid = \\begin{cases} x \\text { n\u1ebfu } x \\geq 0 \\\\ -x \\text { n\u1ebfu } x < 0. \\end{cases} $ <\/span> <br\/><br\/><span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span><br\/> <br\/> N\u1ebfu $ x = 2,8 $ th\u00ec $ \\mid x \\mid = \\mid 2,8 \\mid = 2,8 $ ( V\u00ec $ 2,8 > 0 $ ) <br\/> <br\/> <span class='basic_pink'> \u0110\u00e1p \u00e1n \u0111\u00fang l\u00e0 $2,8$.<\/span><\/span> <br\/>"}]}],"id_ques":154},{"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":[[["2"],["5"]]],"list":[{"point":5,"width":50,"content":"","type_input":"","ques":" <center><img src='https://www.luyenthi123.com/file/luyenthi123/lop7/toan/daiso/bai4/lv1/img\/6.jpg' \/><\/center> N\u1ebfu $ x = \\dfrac{-2}{5} $ th\u00ec $ \\mid x \\mid $= <div class=\"frac123\"><div class=\"ts\">_input_<\/div><div class=\"ms\">_input_<\/div><\/div>","explain":" <span class='basic_left'><span class='basic_green'>H\u01b0\u1edbng d\u1eabn:<\/span><br\/> <i> Gi\u00e1 tr\u1ecb tuy\u1ec7t \u0111\u1ed1i <\/i> c\u1ee7a s\u1ed1 h\u1eefu t\u1ec9 $x$, k\u00ed hi\u1ec7u $ \\mid x \\mid $ l\u00e0 kho\u1ea3ng c\u00e1ch t\u1eeb \u0111i\u1ec3m $x$ t\u1edbi \u0111i\u1ec3m $0$ tr\u00ean tr\u1ee5c s\u1ed1. <br\/> Ta c\u00f3: $ \\mid x \\mid = \\begin{cases} x \\text { n\u1ebfu } x \\geq 0 \\\\ -x \\text { n\u1ebfu } x < 0. \\end{cases} $ <\/span> <br\/><br\/><span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span><br\/> <br\/> N\u1ebfu $ x = \\dfrac{-2}{5} $ th\u00ec $ \\mid x \\mid = \\left| \\dfrac{-2}{5} \\right| = - \\left( \\dfrac{-2}{5} \\right) = \\dfrac{2}{5} $ ( V\u00ec $ \\dfrac{-2}{5} < 0 $ ) <br\/> <br\/> <span class='basic_pink'> \u0110\u00e1p \u00e1n \u0111\u00fang l\u00e0 $ \\dfrac{2}{5}$ <\/span><\/span> <br\/>"}]}],"id_ques":155},{"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":[[["5,2"]]],"list":[{"point":5,"width":50,"content":"","type_input":"","ques":"<center><img src='https://www.luyenthi123.com/file/luyenthi123/lop7/toan/daiso/bai4/lv1/img\/4.jpg' \/><\/center> N\u1ebfu $ x = -5,2 $ th\u00ec $ \\mid x \\mid $= _input_","explain":" <span class='basic_left'><span class='basic_green'>H\u01b0\u1edbng d\u1eabn:<\/span><br\/> <i> Gi\u00e1 tr\u1ecb tuy\u1ec7t \u0111\u1ed1i <\/i> c\u1ee7a s\u1ed1 h\u1eefu t\u1ec9 $x$, k\u00ed hi\u1ec7u $ \\mid x \\mid $ l\u00e0 kho\u1ea3ng c\u00e1ch t\u1eeb \u0111i\u1ec3m $x$ t\u1edbi \u0111i\u1ec3m $0$ tr\u00ean tr\u1ee5c s\u1ed1. <br\/> Ta c\u00f3: $\\qquad $ $ \\mid x \\mid = \\begin{cases} x \\text { n\u1ebfu } x \\geq 0 \\\\ -x \\text { n\u1ebfu } x < 0. \\end{cases} $ <\/span> <br\/><br\/><span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span><br\/> <br\/> N\u1ebfu $ x = -5,2 $ th\u00ec $ \\mid x \\mid = \\mid -5,2 \\mid = - (-5,2) = 5,2 $ ( V\u00ec $ -5,2 < 0 $ ) <br\/> <br\/> <span class='basic_pink'> \u0110\u00e1p \u00e1n \u0111\u00fang l\u00e0 $ 5,2 $ <\/span><\/span> <br\/>"}]}],"id_ques":156},{"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/lop7/toan/daiso/bai4/lv1/img\/4.jpg' \/><\/center>T\u00ecm $x \\in \\mathbb{Q}$, bi\u1ebft: <br\/> $\\mid x \\mid = 5 $ ","select":["A. $ x = 5 $","B. $ x = -5 $","C. $ x > 0 $ ","D. $ x = 5$ ho\u1eb7c $ x = -5 $ "],"hint":" N\u1ebfu $\\mid x \\mid = a $ ( v\u1edbi $ a \\geq 0 $) th\u00ec $ x = \\pm a. $ ","explain":" Ta c\u00f3: $\\mid 5 \\mid = 5 ;$ $\\mid -5 \\mid = -(-5) = 5 $ <br\/> Suy ra $\\mid x \\mid = 5 $ th\u00ec $ x = 5$ ho\u1eb7c $ x = -5 $ <br\/> <br\/> <span class='basic_pink'> \u0110\u00e1p \u00e1n \u0111\u00fang l\u00e0 D.<\/span><\/span> <br\/>","column":2}]}],"id_ques":157},{"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":" T\u00ecm $x \\in \\mathbb{Q}$, bi\u1ebft: $\\mid x \\mid = -5\\dfrac{1}{3} $ ","select":["A. $ x = -5\\dfrac{1}{3} $","B. $ x = 5\\dfrac{1}{3} $","C. $ x < 0 $ ","D. Kh\u00f4ng c\u00f3 $x$ th\u1ecfa m\u00e3n"],"explain":" <center><img src='https://www.luyenthi123.com/file/luyenthi123/lop7/toan/daiso/bai4/lv1/img\/4.jpg' \/><\/center><span class='basic_left'><span class='basic_green'>H\u01b0\u1edbng d\u1eabn:<\/span><br\/> <i> Gi\u00e1 tr\u1ecb tuy\u1ec7t \u0111\u1ed1i <\/i> c\u1ee7a s\u1ed1 h\u1eefu t\u1ec9 $x$, k\u00ed hi\u1ec7u $ \\mid x \\mid $ l\u00e0 kho\u1ea3ng c\u00e1ch t\u1eeb \u0111i\u1ec3m $x$ t\u1edbi \u0111i\u1ec3m $0$ tr\u00ean tr\u1ee5c s\u1ed1. <\/span> <br\/><br\/><span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span><br\/> <br\/> Ta c\u00f3 $\\mid x \\mid > 0 \\quad \\forall x \\in \\mathbb{Q}$ <br\/> Suy ra kh\u00f4ng t\u1ed3n t\u1ea1i x th\u1ecfa m\u00e3n $\\mid x \\mid = -5\\dfrac{1}{3} < 0 $ <br\/> <br\/> <span class='basic_pink'> \u0110\u00e1p \u00e1n \u0111\u00fang l\u00e0 D.<\/span><\/span> <br\/>","column":2}]}],"id_ques":158},{"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/lop7/toan/daiso/bai4/lv1/img\/4.jpg' \/><\/center> T\u00ecm $x \\in \\mathbb{Q}$, bi\u1ebft: $\\mid x \\mid = 0,425 $ v\u00e0 $ x < 0 $ ","select":["A. $ x = 0,425$","B. $ x = -0,425 $","C. $ x \\in \\varnothing$","D. $ x = \\pm 0,425$ "],"hint":" N\u1ebfu $\\mid x \\mid = a $ ( v\u1edbi $ a \\geq 0 $) th\u00ec $ x = \\pm a. $ ","explain":" Ta c\u00f3 $\\mid x \\mid = 0,425 \\Rightarrow x = 0,425$ ho\u1eb7c $ x = -0,425 $ <br\/> Theo b\u00e0i $ x < 0$ n\u00ean $ x = -0,425 $ <br\/> <br\/> <span class='basic_pink'> \u0110\u00e1p \u00e1n \u0111\u00fang l\u00e0 B.<\/span><\/span> <br\/>","column":2}]}],"id_ques":159},{"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/lop7/toan/daiso/bai4/lv1/img\/4.jpg' \/><\/center> T\u00ecm $x \\in \\mathbb{Q}$, bi\u1ebft: $\\mid x - 1,7 \\mid = 2,3 $ ","select":["A. $ x = 4 $","B. $ x = -0,6 $","C. $ x = -4 $","D. C\u1ea3 A v\u00e0 B"],"hint":" N\u1ebfu $\\mid x \\mid = a $ ( v\u1edbi $ a \\geq 0 $) th\u00ec $ x = \\pm a. $ ","explain":" V\u00ec $\\mid x - 1,7 \\mid = 2,3 $ n\u00ean $ x - 1,7 = \\pm 2,3 $ <br\/> X\u00e9t $ x - 1,7 = 2,3 \\Rightarrow x = 2,3 + 1,7 = 4 $ <br\/> X\u00e9t $ x - 1,7 = -2,3 \\Rightarrow x = -2,3 + 1,7 = -0,6 $ <br\/> V\u1eady $ x \\in \\lbrace 4; -0,6 \\rbrace $ <br\/> <br\/> <span class='basic_pink'> \u0110\u00e1p \u00e1n \u0111\u00fang l\u00e0 D.<\/span><\/span> <br\/>","column":2}]}],"id_ques":160},{"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/lop7/toan/daiso/bai4/lv1/img\/2.jpg' \/><\/center> T\u00ecm $x \\in \\mathbb{Q}$, bi\u1ebft: $\\mid 2,5 - x \\mid = 1,3 $ ","select":["A. $ x = 1,2 $ ho\u1eb7c $ x = 3,8 $","B. $ x = -3,8 $ ho\u1eb7c $ x = -1,2 $","C. $ x = -1,2 $","D. $ x = 3,8 $"],"hint":" N\u1ebfu $\\mid x \\mid = a $ ( v\u1edbi $ a \\geq 0 $) th\u00ec $ x = \\pm a. $ ","explain":" V\u00ec $\\mid 2,5 - x \\mid = 1,3 $ n\u00ean $ 2,5 - x = \\pm 1,3 $ <br\/> X\u00e9t $ 2,5 - x = 1,3 \\Rightarrow x = 2,5 - 1,3 = 1,2 $ <br\/> X\u00e9t $ 2,5 - x = -1,3 \\Rightarrow x = 2,5 + 1,3 = 3,8 $ <br\/> V\u1eady $ x \\in \\lbrace 1,2; 3,8 \\rbrace $ <br\/> <br\/> <span class='basic_pink'> \u0110\u00e1p \u00e1n \u0111\u00fang l\u00e0 A.<\/span><\/span> <br\/>","column":2}]}],"id_ques":161},{"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":[[["1,394"]]],"list":[{"point":5,"width":150,"content":"","type_input":"","ques":" <center><img src='https://www.luyenthi123.com/file/luyenthi123/lop7/toan/daiso/bai4/lv1/img\/2.jpg' \/><\/center> Vi\u1ebft k\u1ebft qu\u1ea3 c\u1ee7a ph\u00e9p to\u00e1n $\\mid (-1,13) + (-0,264) \\mid $= _input_","hint":" $ (-a) + (-b) = -(a + b) = -c $ ","explain":" Ta c\u00f3: $ (-1,13) + (-0,264) = -(1,13 + 0,264) = -1,394 $ <br\/> Suy ra $\\mid (-1,13) + (-0,264) \\mid = \\mid -1,394 \\mid = 1,394 $<br\/> <span class='basic_pink'> K\u1ebft qu\u1ea3 c\u1ee7a ph\u00e9p t\u00ednh l\u00e0 $ 1,394 $.<\/span><\/span> <br\/>"}]}],"id_ques":162},{"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":[[["1,889"]]],"list":[{"point":5,"width":150,"content":"","type_input":"","ques":" <center><img src='https://www.luyenthi123.com/file/luyenthi123/lop7/toan/daiso/bai4/lv1/img\/2.jpg' \/><\/center> Vi\u1ebft k\u1ebft qu\u1ea3 c\u1ee7a ph\u00e9p to\u00e1n $\\mid 0,245 - 2,134 \\mid $= _input_","hint":" $ a - b = a + (-b) = -(a - b) = -c $ ","explain":" Ta c\u00f3: $ 0,245 - 2,134 = 0,245 + (-2,134) \\\\ = -(2,134 - 0,245) = -1,889 $ <br\/> Suy ra $\\mid 0,245 - 2,134 \\mid = \\mid -1,889 \\mid = 1,889 $ <br\/> <span class='basic_pink'> K\u1ebft qu\u1ea3 c\u1ee7a ph\u00e9p t\u00ednh l\u00e0 $ 1,889$.<\/span><\/span> <br\/>"}]}],"id_ques":163},{"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":[[["0,32"]]],"list":[{"point":5,"width":100,"content":"","type_input":"","ques":" <center><img src='https://www.luyenthi123.com/file/luyenthi123/lop7/toan/daiso/bai4/lv1/img\/2.jpg' \/><\/center> Vi\u1ebft k\u1ebft qu\u1ea3 c\u1ee7a ph\u00e9p to\u00e1n $\\mid -2,05 + 1,73 \\mid $= _input_","hint":" $ -a + b = -(a - b) = -c $ ","explain":" Ta c\u00f3: $ -2,05 + 1,73 = -(2,05 - 1,73) = -0,32 $ <br\/> Suy ra $\\mid -2,05 + 1,73 \\mid = \\mid -0,32\\mid = 0,32 $ <br\/> <span class='basic_pink'> K\u1ebft qu\u1ea3 c\u1ee7a ph\u00e9p t\u00ednh l\u00e0 $ 0,32 $.<\/span><\/span> <br\/>"}]}],"id_ques":164},{"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":[[["23,4"]]],"list":[{"point":5,"width":150,"content":"","type_input":"","ques":" <center><img src='https://www.luyenthi123.com/file/luyenthi123/lop7/toan/daiso/bai4/lv1/img\/2.jpg' \/><\/center> Vi\u1ebft k\u1ebft qu\u1ea3 c\u1ee7a ph\u00e9p to\u00e1n $\\mid -25,3 - (-1,9) \\mid $= _input_ ","hint":" $ -a - (-b) = -a + b = -(a - b) = -c $ ","explain":" Ta c\u00f3: $ -25,3 - (-1,9) = -25,3 + 1,9 \\\\ = -(25,3 - 1,9) = -23,4$ <br\/> Suy ra $\\mid -25,3 - (-1,9) \\mid = \\mid -23,4 \\mid = 23,4$ <br\/> <span class='basic_pink'> K\u1ebft qu\u1ea3 c\u1ee7a ph\u00e9p t\u00ednh l\u00e0 $ 23,4 $.<\/span><\/span> <br\/>"}]}],"id_ques":165},{"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":[[["17,825"]]],"list":[{"point":5,"width":150,"content":"","type_input":"","ques":" <center><img src='https://www.luyenthi123.com/file/luyenthi123/lop7/toan/daiso/bai4/lv1/img\/10.jpg' \/><\/center> Vi\u1ebft k\u1ebft qu\u1ea3 c\u1ee7a ph\u00e9p to\u00e1n $\\mid (-7,13) . (-2,5) \\mid $= _input_","hint":" $ (-a) . (-b) = +(a . b)$ ","explain":" Ta c\u00f3: $ (-7,13) . (-2,5) = +(7,13 . 2,5) = 17,825 $ <br\/> Suy ra $\\mid (-7,13) . (-2,5) \\mid = \\mid 17,825 \\mid = 17,825 $ <br\/> <span class='basic_pink'> K\u1ebft qu\u1ea3 c\u1ee7a ph\u00e9p t\u00ednh l\u00e0 $ 17,825 $.<\/span><\/span> <br\/>"}]}],"id_ques":166},{"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":[[["5,664"]]],"list":[{"point":5,"width":150,"content":"","type_input":"","ques":" <center><img src='https://www.luyenthi123.com/file/luyenthi123/lop7/toan/daiso/bai4/lv1/img\/10.jpg' \/><\/center> Vi\u1ebft k\u1ebft qu\u1ea3 c\u1ee7a ph\u00e9p to\u00e1n $\\mid (-3,54) . 1,6 \\mid $= _input_","hint":" $ (-a) . b = -(a . b)$ ","explain":" Ta c\u00f3: $ (-3,54) . 1,6 = -(3,54 . 1,6) = -5,664 $ <br\/> Suy ra $\\mid (-3,54) . 1,6 \\mid = \\mid -5,664 \\mid = 5,664 $ <br\/> <span class='basic_pink'> K\u1ebft qu\u1ea3 c\u1ee7a ph\u00e9p t\u00ednh l\u00e0 $ 5,664 $.<\/span><\/span> <br\/>"}]}],"id_ques":167},{"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":[[["3,9"]]],"list":[{"point":5,"width":50,"content":"","type_input":"","ques":" <center><img src='https://www.luyenthi123.com/file/luyenthi123/lop7/toan/daiso/bai4/lv1/img\/10.jpg' \/><\/center> Vi\u1ebft k\u1ebft qu\u1ea3 c\u1ee7a ph\u00e9p to\u00e1n $\\mid (-33,54) : 8,6 \\mid $= _input_ ","hint":" $ (-a) : b = -(a : b)$ ","explain":" Ta c\u00f3: $ (-33,54) : 8,6 = -(33,54 : 8,6) = -3,9 $ <br\/> Suy ra $\\mid (-33,54) : 8,6 \\mid = \\mid -3,9 \\mid = 3,9 $ <br\/> <span class='basic_pink'> K\u1ebft qu\u1ea3 c\u1ee7a ph\u00e9p t\u00ednh l\u00e0 $ 3,9 $.<\/span><\/span> <br\/>"}]}],"id_ques":168},{"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":[[["6,7"]]],"list":[{"point":5,"width":50,"content":"","type_input":"","ques":" <center><img src='https://www.luyenthi123.com/file/luyenthi123/lop7/toan/daiso/bai4/lv1/img\/10.jpg' \/><\/center> Vi\u1ebft k\u1ebft qu\u1ea3 c\u1ee7a ph\u00e9p to\u00e1n $ \\mid 62,98 : (-9,4) \\mid$ = _input_ ","hint":" $ a : (-b) = -(a : b)$ ","explain":" Ta c\u00f3: $ 62,98 : (-9,4) = -(62,98 : 9,4) = -6,7 $ <br\/> Suy ra $\\mid 62,98 : (-9,4) \\mid = \\mid -6,7 \\mid = 6,7 $ <br\/> <span class='basic_pink'> K\u1ebft qu\u1ea3 c\u1ee7a ph\u00e9p t\u00ednh l\u00e0 $ 6,7 $.<\/span><\/span> <br\/>"}]}],"id_ques":169},{"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":[[["5,7"]]],"list":[{"point":5,"width":50,"content":"","type_input":"","ques":" <center><img src='https://www.luyenthi123.com/file/luyenthi123/lop7/toan/daiso/bai4/lv1/img\/10.jpg' \/><\/center> Vi\u1ebft k\u1ebft qu\u1ea3 c\u1ee7a bi\u1ec3u th\u1ee9c $ B = \\mid -3,8 + [(-5,7) + 3,8] \\mid $ = _input_","hint":" Nh\u00f3m s\u1ed1 h\u1ea1ng th\u00edch h\u1ee3p r\u1ed3i th\u1ef1c hi\u1ec7n ph\u00e9p t\u00ednh. ","explain":" Ta c\u00f3: $ -3,8 + [(-5,7) + 3,8] \\\\ = [(-3,8) + 3,8] + (-5,7) \\\\ = 0 + (-5,7) = -5,7 $ <br\/> Suy ra $ B = \\mid -5,7 \\mid = 5,7 $ <br\/> <span class='basic_pink'> Gi\u00e1 tr\u1ecb c\u1ee7a B l\u00e0 $ 5,7 $.<\/span><\/span> <br\/>"}]}],"id_ques":170}],"lesson":{"save":0,"level":1}}