{"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/lop6/toan/daiso/bai25/lv1/img\/3.jpg' \/><\/center> H\u00e3y ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","select":["A. N\u1ebfu a = b th\u00ec a + c = b + c","B. N\u1ebfu a = b th\u00ec a + c > b + c","C. N\u1ebfu a = b th\u00ec a + c < b + c","D. T\u1ea5t c\u1ea3 c\u00e1c \u0111\u00e1p \u00e1n tr\u00ean \u0111\u1ec1u sai"],"hint":"","explain":" <span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span><br\/>Ta c\u00f3:<br\/>N\u1ebfu a = b th\u00ec a + c = b + c<br\/>V\u1eady ta ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0: <span class='basic_pink'> A. N\u1ebfu a = b th\u00ec a + c = b + c<\/span><\/span> <br\/>","column":2}]}],"id_ques":1181},{"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/lop6/toan/daiso/bai25/lv1/img\/5.jpg' \/><\/center> N\u1ebfu a = b th\u00ec b = a. \u0110\u00fang hay sai?","select":["A. \u0110\u00fang","B. Sai"],"hint":"","explain":" <span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span><br\/>Ta c\u00f3:<br\/>N\u1ebfu a = b th\u00ec b = a<br\/>V\u1eady ta ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0: <span class='basic_pink'> A. \u0110\u00fang<\/span><\/span> <br\/>","column":2}]}],"id_ques":1182},{"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 s\u1ed1 nguy\u00ean x, bi\u1ebft:<br\/>x - 1 = 3","select":["A. x = 2","B. x = -2","C. x = -4","D. x = 4"],"hint":"","explain":" <span class='basic_left'><span class='basic_green'>H\u01b0\u1edbng d\u1eabn:<\/span><br\/>Khi chuy\u1ec3n m\u1ed9t s\u1ed1 h\u1ea1ng t\u1eeb v\u1ebf n\u00e0y sang v\u1ebf kia c\u1ee7a m\u1ed9t \u0111\u1eb3ng th\u1ee9c, ta ph\u1ea3i \u0111\u1ed5i d\u1ea5u s\u1ed1 h\u1ea1ng \u0111\u00f3: d\u1ea5u (+) \u0111\u1ed5i th\u00e0nh d\u1ea5u (-) v\u00e0 d\u1ea5u (-) \u0111\u1ed5i th\u00e0nh d\u1ea5u (+)<\/span> <br\/><br\/><span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span><br\/>$\\begin{align*}x - 1 &= 3\\\\x &= 3 + 1 \\\\x&= 4\\end{align*}$<br\/>V\u1eady ta ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0: <span class='basic_pink'> D. x = 4<\/span><\/span> <br\/>","column":2}]}],"id_ques":1183},{"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 s\u1ed1 nguy\u00ean x, bi\u1ebft:<br\/>x + 5 = 8","select":["A. x = 3","B. x = -3","C. x = -13","D. x = 13"],"hint":"","explain":" <span class='basic_left'><span class='basic_green'>H\u01b0\u1edbng d\u1eabn:<\/span><br\/>Khi chuy\u1ec3n m\u1ed9t s\u1ed1 h\u1ea1ng t\u1eeb v\u1ebf n\u00e0y sang v\u1ebf kia c\u1ee7a m\u1ed9t \u0111\u1eb3ng th\u1ee9c, ta ph\u1ea3i \u0111\u1ed5i d\u1ea5u s\u1ed1 h\u1ea1ng \u0111\u00f3: d\u1ea5u (+) \u0111\u1ed5i th\u00e0nh d\u1ea5u (-) v\u00e0 d\u1ea5u (-) \u0111\u1ed5i th\u00e0nh d\u1ea5u (+)<\/span> <br\/><br\/><span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span><br\/>$\\begin{align*}x + 5 &= 8\\\\x &= 8 - 5 \\\\x&= 3\\end{align*}$<br\/>V\u1eady ta ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0: <span class='basic_pink'> A. x = 3<\/span><\/span> <br\/>","column":2}]}],"id_ques":1184},{"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 s\u1ed1 nguy\u00ean x, bi\u1ebft:<br\/>x - (-1) = 9","select":["A. x = 8","B. x = -8","C. x = 10","D. x = -10"],"hint":"","explain":" <span class='basic_left'><span class='basic_green'>H\u01b0\u1edbng d\u1eabn:<\/span><br\/>Khi chuy\u1ec3n m\u1ed9t s\u1ed1 h\u1ea1ng t\u1eeb v\u1ebf n\u00e0y sang v\u1ebf kia c\u1ee7a m\u1ed9t \u0111\u1eb3ng th\u1ee9c, ta ph\u1ea3i \u0111\u1ed5i d\u1ea5u s\u1ed1 h\u1ea1ng \u0111\u00f3: d\u1ea5u (+) \u0111\u1ed5i th\u00e0nh d\u1ea5u (-) v\u00e0 d\u1ea5u (-) \u0111\u1ed5i th\u00e0nh d\u1ea5u (+)<\/span> <br\/><br\/><span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span><br\/>$\\begin{align*}x - (-1) &= 9\\\\x &= 9 + (-1) \\\\x&= 9 - 1\\\\x&= 8\\end{align*}$<br\/>V\u1eady ta ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0: <span class='basic_pink'> A. x = 8<\/span><\/span> <br\/>","column":2}]}],"id_ques":1185},{"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":" T\u00ecm s\u1ed1 nguy\u00ean a, bi\u1ebft:<br\/>|a| = 3","select":["A. a = 3","B. a = -3","C. a = 3 ho\u1eb7c a = -3"],"hint":"","explain":" <span class='basic_left'><span class='basic_green'>H\u01b0\u1edbng d\u1eabn:<\/span><br\/> Kho\u1ea3ng c\u00e1ch t\u1eeb \u0111i\u1ec3m a \u0111\u1ebfn \u0111i\u1ec3m 0 tr\u00ean tr\u1ee5c s\u1ed1 l\u00e0 gi\u00e1 tr\u1ecb tuy\u1ec7t \u0111\u1ed1i c\u1ee7a s\u1ed1 nguy\u00ean a<br\/> N\u00ean:<b> |x| = a (a $\\in$ N) th\u00ec x = a ho\u1eb7c x = -a<\/b><\/span> <br\/><br\/><span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span><br\/>|a| = 3 n\u00ean a = 3 ho\u1eb7c a = -3<br\/>V\u1eady ta ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0: <span class='basic_pink'> C. a = 3 ho\u1eb7c a = -3<\/span><\/span> <br\/>","column":3}]}],"id_ques":1186},{"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":" T\u00ecm s\u1ed1 nguy\u00ean a, bi\u1ebft:<br\/>|a| = 4","select":["A. a = 4","B. a = -4","C. a = 4 ho\u1eb7c a = -4"],"hint":"","explain":" <span class='basic_left'><span class='basic_green'>H\u01b0\u1edbng d\u1eabn:<\/span><br\/> Kho\u1ea3ng c\u00e1ch t\u1eeb \u0111i\u1ec3m a \u0111\u1ebfn \u0111i\u1ec3m 0 tr\u00ean tr\u1ee5c s\u1ed1 l\u00e0 gi\u00e1 tr\u1ecb tuy\u1ec7t \u0111\u1ed1i c\u1ee7a s\u1ed1 nguy\u00ean a<br\/>N\u00ean:<b> |x| = a (a $\\in$ N) th\u00ec x = a ho\u1eb7c x = -a<\/b><\/span> <br\/><br\/><span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span><br\/>|a| = 4 n\u00ean a = 4 ho\u1eb7c a = -4<br\/>V\u1eady ta ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0: <span class='basic_pink'> C. a = 4 ho\u1eb7c a = -4<\/span><\/span> <br\/>","column":3}]}],"id_ques":1187},{"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":" T\u00ecm s\u1ed1 nguy\u00ean a, bi\u1ebft:<br\/>|a + 1| = 4","select":["A. a = 3","B. a = 5","C. a = 3 ho\u1eb7c a = -5","D. a = 3 ho\u1eb7c a = 5"],"hint":"","explain":" <span class='basic_left'><span class='basic_green'>H\u01b0\u1edbng d\u1eabn:<\/span><br\/> Kho\u1ea3ng c\u00e1ch t\u1eeb \u0111i\u1ec3m a \u0111\u1ebfn \u0111i\u1ec3m 0 tr\u00ean tr\u1ee5c s\u1ed1 l\u00e0 gi\u00e1 tr\u1ecb tuy\u1ec7t \u0111\u1ed1i c\u1ee7a s\u1ed1 nguy\u00ean a<br\/>N\u00ean:<b> |x| = a (a $\\in$ N) th\u00ec x = a ho\u1eb7c x = -a<\/b><\/span> <br\/><br\/><span class='basic_left'><span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span><br\/>|a + 1| = 4 n\u00ean a + 1 = 4 ho\u1eb7c a + 1 = -4<br\/>+) <br\/>$\\begin{align*}a + 1 &= 4\\\\a&= 4 - 1 \\\\a&= 3\\end{align*}$<br\/>+) <br\/>$\\begin{align*}a + 1 &= -4\\\\a&= -4 - 1 \\\\a&= - (4 + 1)\\\\a&= -5\\end{align*}$<br\/>V\u1eady ta ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0: <span class='basic_pink'> C. a = 3 ho\u1eb7c a = -5<\/span><\/span> <br\/><\/span>","column":2}]}],"id_ques":1188},{"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, b $\\in$ Z. T\u00ecm s\u1ed1 nguy\u00ean x, bi\u1ebft:<br\/>a + x = b","select":["A. x = a + b","B. x = a - b","C. x = b - a","D. x = -b - a"],"hint":"","explain":" <span class='basic_left'><span class='basic_green'>H\u01b0\u1edbng d\u1eabn:<\/span><br\/>Khi chuy\u1ec3n m\u1ed9t s\u1ed1 h\u1ea1ng t\u1eeb v\u1ebf n\u00e0y sang v\u1ebf kia c\u1ee7a \u0111\u1eb3ng th\u1ee9c, ta ph\u1ea3i \u0111\u1ed5i d\u1ea5u s\u1ed1 h\u1ea1ng \u0111\u00f3: d\u1ea5u ( + ) \u0111\u1ed5i th\u00e0nh d\u1ea5u (-) v\u00e0 d\u1ea5u (-) \u0111\u1ed5i th\u00e0nh d\u1ea5u (+)<\/span><br\/><span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span><br\/>a + x = b $\\Rightarrow$ x = b - a<br\/>V\u1eady ta ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0: <span class='basic_pink'>C. x = b - a<\/span><\/span> <br\/>","column":2}]}],"id_ques":1189},{"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, b $\\in$ Z. T\u00ecm s\u1ed1 nguy\u00ean x, bi\u1ebft:<br\/>x - a = b","select":["A. x = b + a","B. x = a - b","C. x = b - a","D. x = -b - a"],"hint":"","explain":" <span class='basic_left'><span class='basic_green'>H\u01b0\u1edbng d\u1eabn:<\/span><br\/>Khi chuy\u1ec3n m\u1ed9t s\u1ed1 h\u1ea1ng t\u1eeb v\u1ebf n\u00e0y sang v\u1ebf kia c\u1ee7a \u0111\u1eb3ng th\u1ee9c, ta ph\u1ea3i \u0111\u1ed5i d\u1ea5u s\u1ed1 h\u1ea1ng \u0111\u00f3: d\u1ea5u ( + ) \u0111\u1ed5i th\u00e0nh d\u1ea5u (-) v\u00e0 d\u1ea5u (-) \u0111\u1ed5i th\u00e0nh d\u1ea5u (+)<\/span><br\/><span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span><br\/>x - a = b $\\Rightarrow$ x = b + a<br\/>V\u1eady ta ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0: <span class='basic_pink'>A. x = b + a<\/span><\/span> <br\/>","column":2}]}],"id_ques":1190},{"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":" Cho a, b $\\in$ Z. T\u00ecm s\u1ed1 nguy\u00ean x, bi\u1ebft:<br\/>x - a = -b","select":["A. x = b + a","B. x = -b - a","C. x = b - a","D. x = -b + a"],"hint":"","explain":" <span class='basic_left'><span class='basic_green'>H\u01b0\u1edbng d\u1eabn:<\/span><br\/>Khi chuy\u1ec3n m\u1ed9t s\u1ed1 h\u1ea1ng t\u1eeb v\u1ebf n\u00e0y sang v\u1ebf kia c\u1ee7a \u0111\u1eb3ng th\u1ee9c, ta ph\u1ea3i \u0111\u1ed5i d\u1ea5u s\u1ed1 h\u1ea1ng \u0111\u00f3: d\u1ea5u ( + ) \u0111\u1ed5i th\u00e0nh d\u1ea5u (-) v\u00e0 d\u1ea5u (-) \u0111\u1ed5i th\u00e0nh d\u1ea5u (+)<\/span><br\/><span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span><br\/>x - a = -b $\\Rightarrow$ x = -b + a<br\/>V\u1eady ta ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0: <span class='basic_pink'>D. x = -b + a<\/span><\/span> <br\/>","column":2}]}],"id_ques":1191},{"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 s\u1ed1 nguy\u00ean x, bi\u1ebft r\u1eb1ng t\u1ed5ng c\u1ee7a ba s\u1ed1: 4, -1 v\u00e0 x b\u1eb1ng 6.","select":["A. x = 3","B. x = -3","C. x = 1","D. x = -1"],"hint":"","explain":" <span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span><br\/>T\u1ed5ng c\u1ee7a ba s\u1ed1: 4, -1 v\u00e0 x b\u1eb1ng 6<br\/>N\u00ean <br\/>$\\begin{align*}4 + (-1) + x &= 6\\\\4 - 1 + x&= 6 \\\\3 + x&= 6\\\\x&= 6 - 3\\\\x&= 3\\end{align*}$<br\/>V\u1eady ta ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0: <span class='basic_pink'> A. x = 3<\/span><\/span> <br\/>","column":2}]}],"id_ques":1192},{"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 s\u1ed1 nguy\u00ean x, bi\u1ebft r\u1eb1ng t\u1ed5ng c\u1ee7a ba s\u1ed1: -3, 5 v\u00e0 x b\u1eb1ng 9.","select":["A. x = 1","B. x = -1","C. x = -7","D. x = 7"],"hint":"","explain":" <span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span><br\/>T\u1ed5ng c\u1ee7a ba s\u1ed1: -3, 5 v\u00e0 x b\u1eb1ng 9<br\/>N\u00ean<br\/> $\\begin{align*}(-3) + 5 + x &= 9\\\\5 - 3 + x&= 9 \\\\2 + x&= 9\\\\x&= 9 - 2\\\\x&= 7\\end{align*}$<br\/>V\u1eady ta ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0: <span class='basic_pink'> D. x = 7<\/span><\/span> <br\/>","column":2}]}],"id_ques":1193},{"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 s\u1ed1 nguy\u00ean x, bi\u1ebft r\u1eb1ng t\u1ed5ng c\u1ee7a ba s\u1ed1: 8, -7 v\u00e0 x b\u1eb1ng -2.","select":["A. x = -3","B. x = 3","C. x = -1","D. x = 1"],"hint":"","explain":" <span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span><br\/>T\u1ed5ng c\u1ee7a ba s\u1ed1: 8, -7 v\u00e0 x b\u1eb1ng -2<br\/>N\u00ean <br\/>$\\begin{align*}8 + (-7) + x&= -2\\\\8 - 7 + x&= -2 \\\\1 + x&= -2\\\\x&= -2 - 1\\\\x&= - (2 + 1)\\\\x&= -3\\end{align*}$<br\/>V\u1eady ta ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0: <span class='basic_pink'> A. x = -3<\/span><\/span> <br\/>","column":2}]}],"id_ques":1194},{"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":[[["-31"]]],"list":[{"point":5,"width":60,"type_input":"","ques":"<center><img src='https://www.luyenthi123.com/file/luyenthi123/lop6/toan/daiso/bai25/lv1/img\/2.jpg' \/><\/center>-(3 - 2 + 11) + (-2 - 17)= _input_","hint":"","explain":"<span class='basic_left'><span class='basic_green'>H\u01b0\u1edbng d\u1eabn:<\/span><br\/> Thay \u0111\u1ed5i v\u1ecb tr\u00ed s\u1ed1 h\u1ea1ng v\u00e0 b\u1ecf ho\u1eb7c \u0111\u1eb7t d\u1ea5u ngo\u1eb7c m\u1ed9t c\u00e1ch th\u00edch h\u1ee3p r\u1ed3i t\u00ednh.<br\/><b>L\u01b0u \u00fd: <\/b><br\/>+ Khi b\u1ecf d\u1ea5u ngo\u1eb7c c\u00f3 d\u1ea5u (-) \u0111\u1eb1ng tr\u01b0\u1edbc, ta ph\u1ea3i \u0111\u1ed5i t\u1ea5t c\u1ea3 c\u00e1c s\u1ed1 h\u1ea1ng trong d\u1ea5u ngo\u1eb7c: d\u1ea5u ( + ) th\u00e0nh d\u1ea5u ( - ) v\u00e0 d\u1ea5u ( - ) th\u00e0nh d\u1ea5u ( + )<br\/>+ Khi b\u1ecf d\u1ea5u ngo\u1eb7c c\u00f3 d\u1ea5u ( + ) \u0111\u1eb1ng tr\u01b0\u1edbc th\u00ec d\u1ea5u c\u00e1c s\u1ed1 h\u1ea1ng trong ngo\u1eb7c v\u1eabn gi\u1eef nguy\u00ean.<\/span> <br\/><br\/><span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span><br\/>$\\begin{align*}-(3 - 2 + 11) + (-2 - 17) &= -3 + 2 - 11 - 2 - 17\\\\&= - (3 + 17 + 11) + (2 - 2)\\\\&= -31 + 0\\\\&= -31\\end{align*}$<br\/>V\u1eady s\u1ed1 c\u1ea7n \u0111i\u1ec1n v\u00e0o \u00f4 tr\u1ed1ng l\u00e0: <span class='basic_pink'> -31<\/span><\/span> <br\/> "}]}],"id_ques":1195},{"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":[[["-24"]]],"list":[{"point":5,"width":60,"type_input":"","ques":"<center><img src='https://www.luyenthi123.com/file/luyenthi123/lop6/toan/daiso/bai25/lv1/img\/2.jpg' \/><\/center> -(14 + 17) + (20 - 13)= _input_","hint":"","explain":"<span class='basic_left'><span class='basic_green'>H\u01b0\u1edbng d\u1eabn:<\/span><br\/> Thay \u0111\u1ed5i v\u1ecb tr\u00ed s\u1ed1 h\u1ea1ng v\u00e0 b\u1ecf ho\u1eb7c \u0111\u1eb7t d\u1ea5u ngo\u1eb7c m\u1ed9t c\u00e1ch th\u00edch h\u1ee3p r\u1ed3i t\u00ednh.<br\/><b>L\u01b0u \u00fd: <\/b><br\/>+ Khi b\u1ecf d\u1ea5u ngo\u1eb7c c\u00f3 d\u1ea5u (-) \u0111\u1eb1ng tr\u01b0\u1edbc, ta ph\u1ea3i \u0111\u1ed5i t\u1ea5t c\u1ea3 c\u00e1c s\u1ed1 h\u1ea1ng trong d\u1ea5u ngo\u1eb7c: d\u1ea5u ( + ) th\u00e0nh d\u1ea5u ( - ) v\u00e0 d\u1ea5u ( - ) th\u00e0nh d\u1ea5u ( + )<br\/>+ Khi b\u1ecf d\u1ea5u ngo\u1eb7c c\u00f3 d\u1ea5u ( + ) \u0111\u1eb1ng tr\u01b0\u1edbc th\u00ec d\u1ea5u c\u00e1c s\u1ed1 h\u1ea1ng trong ngo\u1eb7c v\u1eabn gi\u1eef nguy\u00ean.<\/span> <br\/><br\/><span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span><br\/>$\\begin{align*}-(14 + 17) + (20 - 13) &= -14 - 17 + 20 - 13\\\\&= -(17 + 13) + (20 - 14)\\\\&= -30 + 6\\\\&= -24\\end{align*}$<br\/>V\u1eady s\u1ed1 c\u1ea7n \u0111i\u1ec1n v\u00e0o \u00f4 tr\u1ed1ng l\u00e0: <span class='basic_pink'> -24<\/span><\/span> <br\/> "}]}],"id_ques":1196},{"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":[[["-16"]]],"list":[{"point":5,"width":60,"type_input":"","ques":"<center><img src='https://www.luyenthi123.com/file/luyenthi123/lop6/toan/daiso/bai25/lv1/img\/2.jpg' \/><\/center> (-55 + 28 + 48) - (-39 + 28 + 48) = _input_","hint":"","explain":"<span class='basic_left'><span class='basic_green'>H\u01b0\u1edbng d\u1eabn:<\/span><br\/> Thay \u0111\u1ed5i v\u1ecb tr\u00ed s\u1ed1 h\u1ea1ng v\u00e0 b\u1ecf ho\u1eb7c \u0111\u1eb7t d\u1ea5u ngo\u1eb7c m\u1ed9t c\u00e1ch th\u00edch h\u1ee3p r\u1ed3i t\u00ednh.<br\/><b>L\u01b0u \u00fd: <\/b><br\/>+ Khi b\u1ecf d\u1ea5u ngo\u1eb7c c\u00f3 d\u1ea5u (-) \u0111\u1eb1ng tr\u01b0\u1edbc, ta ph\u1ea3i \u0111\u1ed5i t\u1ea5t c\u1ea3 c\u00e1c s\u1ed1 h\u1ea1ng trong d\u1ea5u ngo\u1eb7c: d\u1ea5u ( + ) th\u00e0nh d\u1ea5u ( - ) v\u00e0 d\u1ea5u ( - ) th\u00e0nh d\u1ea5u ( + )<br\/>+ Khi b\u1ecf d\u1ea5u ngo\u1eb7c c\u00f3 d\u1ea5u ( + ) \u0111\u1eb1ng tr\u01b0\u1edbc th\u00ec d\u1ea5u c\u00e1c s\u1ed1 h\u1ea1ng trong ngo\u1eb7c v\u1eabn gi\u1eef nguy\u00ean.<\/span> <br\/><br\/><span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span><br\/>$\\begin{align*}(-55 + 28 + 48) - (-39 + 28 + 48) &= -55 + 28 + 48 + 39 - 28 - 48\\\\&= (28 - 28) + (48 - 48) - (55 - 39)\\\\&= 0 + 0 - 16\\\\&= -16\\end{align*}$<br\/>V\u1eady s\u1ed1 c\u1ea7n \u0111i\u1ec1n v\u00e0o \u00f4 tr\u1ed1ng l\u00e0: <span class='basic_pink'> -16<\/span><\/span> <br\/> "}]}],"id_ques":1197},{"time":24,"part":[{"title":"L\u1ef1a ch\u1ecdn \u0111\u00fang hay sai","title_trans":"","temp":"true_false","correct":[["t","t","f"]],"list":[{"point":5,"image":"","col_name":["","\u0110\u00fang","Sai"],"arr_ques":[" 16 - x = 19 th\u00ec x = -3 "," x - (-3) = 7 th\u00ec x = 4 "," x + 17 = 15 th\u00ec x = 2"],"hint":"","explain":["16 - x = 19 th\u00ec x = -3 (\u0110\u00fang). V\u00ec <br\/>$\\begin{align*}16 - x &= 19\\\\x &= 16 - 19 \\\\x&= -(19 - 16)\\\\x&= -3\\end{align*}$ ","<br\/> x - (-3) = 7 th\u00ec x = 4 (\u0110\u00fang). V\u00ec <br\/>$\\begin{align*}x - (-3) &= 7\\\\x + 3 &= 7 \\\\x&= 7 - 3\\\\x&= 4\\end{align*}$ ","<br\/> x + 17 = 15 th\u00ec x = 2 (Sai). V\u00ec<br\/> $\\begin{align*}x + 17 &= 15\\\\x &= 15 - 17 \\\\x&= -(17 - 15)\\\\x&= -2\\end{align*}$ "]}]}],"id_ques":1198},{"time":24,"part":[{"title":"L\u1ef1a ch\u1ecdn \u0111\u00fang hay sai","title_trans":"","temp":"true_false","correct":[["f","t","f"]],"list":[{"point":5,"image":"","col_name":["","\u0110\u00fang","Sai"],"arr_ques":[" x - (-5) = -7 th\u00ec x = -2 "," x - 8 = 6 th\u00ec x = 14 "," 15 - x = 4 th\u00ec x = -11"],"hint":"","explain":["x - (-5) = -7 th\u00ec x = -2 (Sai). V\u00ec <br\/>$\\begin{align*}x - (-5) &= -7\\\\x &= -7 + (-5) \\\\x&= -(7 + 5)\\\\x&= -12\\end{align*}$ ","<br\/> x - 8 = 6 th\u00ec x = 14 (\u0110\u00fang). V\u00ec <br\/>$\\begin{align*}x - 8 &= 6\\\\x &= 6 + 8 \\\\x&= 14\\end{align*}$ ","<br\/> 15 - x = 4 th\u00ec x = -11 (Sai). V\u00ec<br\/> $\\begin{align*}15 - x &= 4\\\\x &= 15 - 4 \\\\x&= 11\\end{align*}$ "]}]}],"id_ques":1199},{"time":24,"part":[{"title":"L\u1ef1a ch\u1ecdn \u0111\u00fang hay sai","title_trans":"","temp":"true_false","correct":[["t","t","f"]],"list":[{"point":5,"image":"","col_name":["","\u0110\u00fang","Sai"],"arr_ques":[" 8 - x = 6 th\u00ec x = 2 "," 9 + x = 15 th\u00ec x = 6 "," x - 6 = 9 th\u00ec x = -15"],"hint":"","explain":[" 8 - x = 6 th\u00ec x = 2 (\u0110\u00fang). V\u00ec <br\/>$\\begin{align*}8 - x &= 6\\\\x &= 8 - 6 \\\\x&= 2\\end{align*}$ ","<br\/> 9 + x = 15 th\u00ec x = 6 (\u0110\u00fang). V\u00ec <br\/>$\\begin{align*} 9 + x &= 15\\\\x &= 15 - 9 \\\\x&= 6\\end{align*}$ ","<br\/> x - 6 = 9 th\u00ec x = -15 (Sai). V\u00ec<br\/> $\\begin{align*}x - 6 &= 9\\\\x &= 9 + 6 \\\\x&= 15\\end{align*}$ "]}]}],"id_ques":1200}],"lesson":{"save":0,"level":1}}