{"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":[[["-3","- 3"," -3"," - 3"," - 3 "]]],"list":[{"point":5,"width":60,"type_input":"","ques":"<center><img src='https://www.luyenthi123.com/file/luyenthi123/lop6/toan/daiso/bai23/lv1/img\/2.jpg' \/><\/center>12 - 15 = _input_","hint":"","explain":"<span class='basic_left'><span class='basic_green'>H\u01b0\u1edbng d\u1eabn:<\/span><br\/> Mu\u1ed1n tr\u1eeb s\u1ed1 nguy\u00ean a cho s\u1ed1 nguy\u00ean b, ta c\u1ed9ng a v\u1edbi s\u1ed1 \u0111\u1ed1i c\u1ee7a b<br\/><b>a - b = a + (-b)<\/b><\/span> <br\/><br\/><span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span><br\/>12 - 15 = 12 + (-15) = -3<br\/>V\u1eady s\u1ed1 c\u1ea7n \u0111i\u1ec1n v\u00e0o \u00f4 tr\u1ed1ng l\u00e0: <span class='basic_pink'> -3<\/span><\/span> <br\/> "}]}],"id_ques":1091},{"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":[[["-38","- 38"," -38"," - 38"," - 38 "]]],"list":[{"point":5,"width":60,"type_input":"","ques":"<center><img src='https://www.luyenthi123.com/file/luyenthi123/lop6/toan/daiso/bai23/lv1/img\/2.jpg' \/><\/center>120 - 158 = _input_","hint":"","explain":"<span class='basic_left'><span class='basic_green'>H\u01b0\u1edbng d\u1eabn:<\/span><br\/> Mu\u1ed1n tr\u1eeb s\u1ed1 nguy\u00ean a cho s\u1ed1 nguy\u00ean b, ta c\u1ed9ng a v\u1edbi s\u1ed1 \u0111\u1ed1i c\u1ee7a b<br\/><b>a - b = a + (-b)<\/b><\/span> <br\/><br\/><span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span><br\/>120 - 158 = 120 + (-158) = -38<br\/>V\u1eady s\u1ed1 c\u1ea7n \u0111i\u1ec1n v\u00e0o \u00f4 tr\u1ed1ng l\u00e0: <span class='basic_pink'> -38<\/span><\/span> <br\/> "}]}],"id_ques":1092},{"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":[[["-158","- 158"," -158"," - 158"," - 158 "]]],"list":[{"point":5,"width":60,"type_input":"","ques":"<center><img src='https://www.luyenthi123.com/file/luyenthi123/lop6/toan/daiso/bai23/lv1/img\/2.jpg' \/><\/center>170 - 328 = _input_","hint":"","explain":"<span class='basic_left'><span class='basic_green'>H\u01b0\u1edbng d\u1eabn:<\/span><br\/> Mu\u1ed1n tr\u1eeb s\u1ed1 nguy\u00ean a cho s\u1ed1 nguy\u00ean b, ta c\u1ed9ng a v\u1edbi s\u1ed1 \u0111\u1ed1i c\u1ee7a b<br\/><b>a - b = a + (-b)<\/b><\/span> <br\/><br\/><span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span><br\/>170 - 328 = 170 + (-328) = -158<br\/>V\u1eady s\u1ed1 c\u1ea7n \u0111i\u1ec1n v\u00e0o \u00f4 tr\u1ed1ng l\u00e0: <span class='basic_pink'> -158<\/span><\/span> <br\/> "}]}],"id_ques":1093},{"time":9,"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\/>7 + x = 4","select":["x = 3","x = -3","x = 4","x = -4"],"hint":"","explain":" <span class='basic_left'><span class='basic_green'>H\u01b0\u1edbng d\u1eabn:<\/span><br\/>x \u1edf v\u1ecb tr\u00ed l\u00e0 s\u1ed1 h\u1ea1ng<br\/><b>L\u01b0u \u00fd: <\/b> <b><i> S\u1ed1 h\u1ea1ng ch\u01b0a bi\u1ebft = T\u1ed5ng - S\u1ed1 h\u1ea1ng \u0111\u00e3 bi\u1ebft<\/i><\/b><\/span> <br\/><br\/><span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span><br\/>$\\begin{align*}7 + x &= 4\\\\x&= 4 - 7 \\\\x&= 4 + (-7)\\\\x&= -3\\end{align*}$<br\/>V\u1eady ta ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0: <span class='basic_pink'> x = -3<\/span><\/span> <br\/>","column":2}]}],"id_ques":1094},{"time":9,"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 x, bi\u1ebft:<br\/>-5 + x = 10","select":["x = 5","x = -5","x = 15","x = -15"],"hint":"","explain":" <span class='basic_left'><span class='basic_green'>H\u01b0\u1edbng d\u1eabn:<\/span><br\/>x \u1edf v\u1ecb tr\u00ed l\u00e0 s\u1ed1 h\u1ea1ng<br\/><b>L\u01b0u \u00fd: <\/b> <b><i> S\u1ed1 h\u1ea1ng ch\u01b0a bi\u1ebft = T\u1ed5ng - S\u1ed1 h\u1ea1ng \u0111\u00e3 bi\u1ebft<\/i><\/b><\/span> <br\/><br\/><span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span><br\/>$\\begin{align*}-5 + x &= 10\\\\x&= 10 - (-5) \\\\x&= 10 + 5\\\\x&= 15\\end{align*}$<br\/>V\u1eady ta ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0: <span class='basic_pink'> x = 15<\/span><\/span> <br\/>","column":2}]}],"id_ques":1095},{"time":9,"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 x, bi\u1ebft:<br\/>-2 + x = 7","select":["x = 5","x = -5","x = 9","x = -9"],"hint":"","explain":" <span class='basic_left'><span class='basic_green'>H\u01b0\u1edbng d\u1eabn:<\/span><br\/>x \u1edf v\u1ecb tr\u00ed l\u00e0 s\u1ed1 h\u1ea1ng<br\/><b>L\u01b0u \u00fd: <\/b> <b><i> S\u1ed1 h\u1ea1ng ch\u01b0a bi\u1ebft = T\u1ed5ng - S\u1ed1 h\u1ea1ng \u0111\u00e3 bi\u1ebft<\/i><\/b><\/span> <br\/><br\/><span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span><br\/>$\\begin{align*}-2 + x &= 7\\\\x&= 7 - (-2) \\\\x&= 7 + 2\\\\x&= 9\\end{align*}$<br\/>V\u1eady ta ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0: <span class='basic_pink'> x = 9<\/span><\/span> <br\/>","column":2}]}],"id_ques":1096},{"time":9,"part":[{"title":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","title_trans":"","temp":"multiple_choice","correct":[[2]],"list":[{"point":5,"ques":" 115 - 824 <span class='basic_hoi_black'>?<\/span> -530","select":[" >"," < "," = "],"hint":"","explain":" <span class='basic_left'><span class='basic_green'>H\u01b0\u1edbng d\u1eabn:<\/span><br\/>B\u01b0\u1edbc 1: T\u00ednh gi\u00e1 tr\u1ecb c\u1ee7a ph\u00e9p t\u00ednh b\u00ean v\u1ebf ph\u1ea3i<br\/>B\u01b0\u1edbc 2: So s\u00e1nh<br\/><b>L\u01b0u \u00fd: <i> Mu\u1ed1n tr\u1eeb s\u1ed1 nguy\u00ean a cho s\u1ed1 nguy\u00ean b, ta c\u1ed9ng a v\u1edbi s\u1ed1 \u0111\u1ed1i c\u1ee7a b <\/i><\/b><\/span> <br\/><br\/><span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span><br\/> Ta c\u00f3: <br\/> $\\begin{align*}115 - 824&= 115 + (-824)\\\\&= -709 \\end{align*}$ <br\/>M\u00e0 <b>-709 < -530<\/b><br\/>N\u00ean <b>115 - 824 < -530<\/b><br\/>V\u1eady ta ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0: <span class='basic_pink'> <<\/span><\/span><\/span> <br\/> ","column":3}]}],"id_ques":1097},{"time":9,"part":[{"title":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","title_trans":"","temp":"multiple_choice","correct":[[1]],"list":[{"point":5,"ques":" 247 - 350 <span class='basic_hoi_black'>?<\/span> -425","select":[" >"," < "," = "],"hint":"","explain":" <span class='basic_left'><span class='basic_green'>H\u01b0\u1edbng d\u1eabn:<\/span><br\/>B\u01b0\u1edbc 1: T\u00ednh gi\u00e1 tr\u1ecb c\u1ee7a ph\u00e9p t\u00ednh b\u00ean v\u1ebf ph\u1ea3i<br\/>B\u01b0\u1edbc 2: So s\u00e1nh<br\/><b>L\u01b0u \u00fd: <i> Mu\u1ed1n tr\u1eeb s\u1ed1 nguy\u00ean a cho s\u1ed1 nguy\u00ean b, ta c\u1ed9ng a v\u1edbi s\u1ed1 \u0111\u1ed1i c\u1ee7a b <\/i><\/b><\/span> <br\/><br\/><span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span><br\/> Ta c\u00f3: <br\/> $\\begin{align*}247 - 350&= 247 + (-350)\\\\&= -103 \\end{align*}$ <br\/>M\u00e0 <b>-103 > -425<\/b><br\/>N\u00ean <b>247 - 350 > -425<\/b><br\/>V\u1eady ta ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0: <span class='basic_pink'> ><\/span><\/span><\/span> <br\/> ","column":3}]}],"id_ques":1098},{"time":9,"part":[{"title":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","title_trans":"","temp":"multiple_choice","correct":[[2]],"list":[{"point":5,"ques":" -384 - 120 <span class='basic_hoi_black'>?<\/span> -362","select":[" >"," < "," = "],"hint":"","explain":" <span class='basic_left'><span class='basic_green'>H\u01b0\u1edbng d\u1eabn:<\/span><br\/>B\u01b0\u1edbc 1: T\u00ednh gi\u00e1 tr\u1ecb c\u1ee7a ph\u00e9p t\u00ednh b\u00ean v\u1ebf ph\u1ea3i<br\/>B\u01b0\u1edbc 2: So s\u00e1nh<br\/><b>L\u01b0u \u00fd: <i> Mu\u1ed1n tr\u1eeb s\u1ed1 nguy\u00ean a cho s\u1ed1 nguy\u00ean b, ta c\u1ed9ng a v\u1edbi s\u1ed1 \u0111\u1ed1i c\u1ee7a b <\/i><\/b><\/span> <br\/><br\/><span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span><br\/> Ta c\u00f3: <br\/> $\\begin{align*}-384 - 120&= -384 + (-120)\\\\&= -504 \\end{align*}$ <br\/>M\u00e0 <b>-504 < -362<\/b><br\/>N\u00ean <b>-384 - 120 < -362<\/b><br\/>V\u1eady ta ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0: <span class='basic_pink'> <<\/span><\/span><\/span> <br\/> ","column":3}]}],"id_ques":1099},{"time":9,"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\u00ednh gi\u00e1 tr\u1ecb c\u1ee7a bi\u1ec3u th\u1ee9c:<br\/>A = 312 - x , bi\u1ebft x = -47","select":["A = 265","A = -265","A = 359","A = -359"],"hint":"","explain":" <span class='basic_left'><span class='basic_green'>H\u01b0\u1edbng d\u1eabn:<\/span><br\/> Mu\u1ed1n tr\u1eeb s\u1ed1 nguy\u00ean a cho s\u1ed1 nguy\u00ean b, ta c\u1ed9ng a v\u1edbi s\u1ed1 \u0111\u1ed1i c\u1ee7a b<\/span> <br\/><br\/><span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span><br\/>Thay x = -47 v\u00e0o bi\u1ec3u th\u1ee9c A = 312 - x ta \u0111\u01b0\u1ee3c:<br\/>$\\begin{align*}A&= 312 - (-47) \\\\A&= 312 + 47\\\\A&= 359\\end{align*}$<br\/>V\u1eady ta ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0: <span class='basic_pink'> A = 359<\/span><\/span> <br\/>","column":2}]}],"id_ques":1100},{"time":9,"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 gi\u00e1 tr\u1ecb c\u1ee7a bi\u1ec3u th\u1ee9c:<br\/>A = -415 - x , bi\u1ebft x = -125","select":["A = 290","A = -290","A = 540","A = -540"],"hint":"","explain":" <span class='basic_left'><span class='basic_green'>H\u01b0\u1edbng d\u1eabn:<\/span><br\/> Mu\u1ed1n tr\u1eeb s\u1ed1 nguy\u00ean a cho s\u1ed1 nguy\u00ean b, ta c\u1ed9ng a v\u1edbi s\u1ed1 \u0111\u1ed1i c\u1ee7a b<\/span> <br\/><br\/><span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span><br\/>Thay x = -125 v\u00e0o bi\u1ec3u th\u1ee9c A = -415 - x ta \u0111\u01b0\u1ee3c:<br\/>$\\begin{align*}A&= -415 - (-125) \\\\A&= -415 + 125\\\\A&= - (415 - 125)\\\\A&= - 290\\end{align*}$<br\/>V\u1eady ta ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0: <span class='basic_pink'> A = -290<\/span><\/span> <br\/>","column":2}]}],"id_ques":1101},{"time":9,"part":[{"title":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","title_trans":"","temp":"multiple_choice","correct":[[2]],"list":[{"point":5,"ques":" Tr\u00ean t\u1eadp h\u1ee3p s\u1ed1 nguy\u00ean Z, c\u00e1ch t\u00ednh \u0111\u00fang l\u00e0:","select":["A. 15 - 18 = 3","B. 15 - 18 = -3","C. 15 - 18 = -33","D. 15 - 18 = 33"],"hint":"","explain":" <span class='basic_left'><span class='basic_green'>H\u01b0\u1edbng d\u1eabn:<\/span><br\/> Mu\u1ed1n tr\u1eeb s\u1ed1 nguy\u00ean a cho s\u1ed1 nguy\u00ean b, ta c\u1ed9ng a v\u1edbi s\u1ed1 \u0111\u1ed1i c\u1ee7a b<\/span> <br\/><br\/><span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span><br\/>$\\begin{align*}15 - 18&= 15 + (-18)\\\\&= -3\\end{align*}$<br\/>V\u1eady ta ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0: <span class='basic_pink'> B. 15 - 18 = -3<\/span><\/span> <br\/>","column":2}]}],"id_ques":1102},{"time":9,"part":[{"title":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","title_trans":"","temp":"multiple_choice","correct":[[1]],"list":[{"point":5,"ques":" Tr\u00ean t\u1eadp h\u1ee3p s\u1ed1 nguy\u00ean Z, c\u00e1ch t\u00ednh \u0111\u00fang l\u00e0:","select":["A. 12 - (-8) = 20","B. 12 - (-8) = -20","C. 12 - (-8) = 4","D. 12 - (-8) = -4"],"hint":"","explain":" <span class='basic_left'><span class='basic_green'>H\u01b0\u1edbng d\u1eabn:<\/span><br\/> Mu\u1ed1n tr\u1eeb s\u1ed1 nguy\u00ean a cho s\u1ed1 nguy\u00ean b, ta c\u1ed9ng a v\u1edbi s\u1ed1 \u0111\u1ed1i c\u1ee7a b<\/span> <br\/><br\/><span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span><br\/>$\\begin{align*}12 - (-8)&= 12 + 8\\\\&= 20\\end{align*}$<br\/>V\u1eady ta ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0: <span class='basic_pink'> A. 12 - (-8) = 20<\/span><\/span> <br\/>","column":2}]}],"id_ques":1103},{"time":24,"part":[{"title":"\u0110i\u1ec1n s\u1ed1 th\u00edch h\u1ee3p v\u00e0o \u00f4 tr\u1ed1ng","title_trans":"","temp":"fill_the_blank","correct":[[["-849","- 849"," -849"],["-128","- 128"," -128"]]],"list":[{"point":5,"width":50,"type_input":"","ques":"<table><tr><th>a<\/th><th>-812<\/th><th>112<\/th><\/tr><tr><td>b<\/td><td>37<\/td><td>240<\/td><\/tr><tr><td>a - b<\/td><td>_input_<\/td><td>_input_<\/td><\/tr><\/table>","hint":"","explain":"<span class='basic_left'><span class='basic_green'>H\u01b0\u1edbng d\u1eabn:<\/span><br\/>Mu\u1ed1n tr\u1eeb s\u1ed1 nguy\u00ean a cho s\u1ed1 nguy\u00ean b, ta c\u1ed9ng a v\u1edbi s\u1ed1 \u0111\u1ed1i c\u1ee7a b<\/span> <br\/><br\/><span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span><br\/> <b>+ a = -812; b = 37 th\u00ec:<\/b> <br\/>$\\begin{align*}a - b &=(-812) - 37\\\\&= (-812 + (-37)\\\\&= -849\\end{align*}$<br\/><b>+ a = 112; b = 240 th\u00ec:<\/b><br\/>$\\begin{align*}a - b &=112 - 240\\\\&= 112 + (-240)\\\\&= -(240 - 112)\\\\&= -128\\end{align*}$<br\/>V\u1eady c\u00e1c s\u1ed1 c\u1ea7n \u0111i\u1ec1n v\u00e0o \u00f4 tr\u1ed1ng theo th\u1ee9 t\u1ef1 t\u1eeb tr\u00e1i qua ph\u1ea3i l\u00e0: <span class='basic_pink'>-849; -128<\/span><\/span> <br\/>"}]}],"id_ques":1104},{"time":24,"part":[{"title":"\u0110i\u1ec1n s\u1ed1 th\u00edch h\u1ee3p v\u00e0o \u00f4 tr\u1ed1ng","title_trans":"","temp":"fill_the_blank","correct":[[["-13","- 13"," -13"],["-186","- 186"," -186"]]],"list":[{"point":5,"width":50,"type_input":"","ques":"<table><tr><th>a<\/th><th>-58<\/th><th>192<\/th><\/tr><tr><td>b<\/td><td>-45<\/td><td>378<\/td><\/tr><tr><td>a - b<\/td><td>_input_<\/td><td>_input_<\/td><\/tr><\/table>","hint":"","explain":"<span class='basic_left'><span class='basic_green'>H\u01b0\u1edbng d\u1eabn:<\/span><br\/>Mu\u1ed1n tr\u1eeb s\u1ed1 nguy\u00ean a cho s\u1ed1 nguy\u00ean b, ta c\u1ed9ng a v\u1edbi s\u1ed1 \u0111\u1ed1i c\u1ee7a b<\/span> <br\/><br\/><span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span><br\/> <b>+ a = -58; b = -45 th\u00ec:<\/b> <br\/>$\\begin{align*}a - b &=(-58) - (-45)\\\\&= (-58) + 45\\\\&= -13\\end{align*}$<br\/><b>+ a = 192; b = 378 th\u00ec:<\/b><br\/>$\\begin{align*}a - b&= 192 - 378\\\\&= 192 + (-378)\\\\&= -(378 - 192)\\\\&= -186\\end{align*}$<br\/>V\u1eady c\u00e1c s\u1ed1 c\u1ea7n \u0111i\u1ec1n v\u00e0o \u00f4 tr\u1ed1ng theo th\u1ee9 t\u1ef1 t\u1eeb tr\u00e1i qua ph\u1ea3i l\u00e0: <span class='basic_pink'>-13; -186<\/span><\/span> <br\/>"}]}],"id_ques":1105},{"time":24,"part":[{"title":"\u0110i\u1ec1n s\u1ed1 th\u00edch h\u1ee3p v\u00e0o \u00f4 tr\u1ed1ng","title_trans":"","temp":"fill_the_blank","correct":[[["23"," 23","+23","+ 23"," 23 "],["-67","- 67"," -67"]]],"list":[{"point":5,"width":50,"type_input":"","ques":"<table><tr><th>a<\/th><th>-7<\/th><th>-25<\/th><\/tr><tr><td>b<\/td><td>-30<\/td><td>42<\/td><\/tr><tr><td>a - b<\/td><td>_input_<\/td><td>_input_<\/td><\/tr><\/table>","hint":"","explain":"<span class='basic_left'><span class='basic_green'>H\u01b0\u1edbng d\u1eabn:<\/span><br\/>Mu\u1ed1n tr\u1eeb s\u1ed1 nguy\u00ean a cho s\u1ed1 nguy\u00ean b, ta c\u1ed9ng a v\u1edbi s\u1ed1 \u0111\u1ed1i c\u1ee7a b<\/span> <br\/><br\/><span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span><br\/> <b>+ a = -8; b = -12 th\u00ec:<\/b> <br\/>$\\begin{align*}a - b &=(-7) - (-30)\\\\&= (-7) + 30\\\\&= 30 - 7\\\\&= 23\\end{align*}$<br\/><b>+ a = -25; b = 42 th\u00ec:<\/b><br\/>$\\begin{align*}a - b&= -25 - 42\\\\&= (-25) + (-42)\\\\&= -(25 + 42)\\\\&= -67\\end{align*}$<br\/>V\u1eady c\u00e1c s\u1ed1 c\u1ea7n \u0111i\u1ec1n v\u00e0o \u00f4 tr\u1ed1ng theo th\u1ee9 t\u1ef1 t\u1eeb tr\u00e1i qua ph\u1ea3i l\u00e0: <span class='basic_pink'>23; -67<\/span><\/span> <br\/>"}]}],"id_ques":1106},{"time":24,"part":[{"title":"\u0110i\u1ec1n s\u1ed1 th\u00edch h\u1ee3p v\u00e0o \u00f4 tr\u1ed1ng","title_trans":"","temp":"fill_the_blank","correct":[[["1"," 1","+1","+ 1"," 1 "],["0"," 0"," 0 "],["0"," 0"," 0 "],["0"," 0"," 0 "]]],"list":[{"point":5,"width":50,"type_input":"","ques":"<table><tr><th>a<\/th><th>_input_<\/th><th>_input_<\/th><\/tr><tr><td>-a<\/td><td>-1<\/td><td>0<\/td><\/tr><tr><td>a + (-a)<\/td><td>_input_<\/td><td>_input_<\/td><\/tr><\/table>","hint":"","explain":"<span class='basic_left'><span class='basic_green'>H\u01b0\u1edbng d\u1eabn:<\/span><br\/>+ a v\u00e0 -a l\u00e0 hai s\u1ed1 nguy\u00ean \u0111\u1ed1i nhau<br\/>+ T\u1ed5ng c\u1ee7a hai s\u1ed1 nguy\u00ean \u0111\u1ed1i nhau lu\u00f4n b\u1eb1ng 0<br\/> <b>a + (-a) = 0<\/b><\/span> <br\/><br\/><span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span><br\/>Ta c\u00f3: a + (-a) = 0<br\/>N\u00ean c\u00e1c s\u1ed1 c\u1ea7n \u0111i\u1ec1n v\u00e0o \u00f4 tr\u1ed1ng \u1edf h\u00e0ng th\u1ee9 3 t\u1eeb tr\u00e1i qua ph\u1ea3i l\u1ea7n l\u01b0\u1ee3t l\u00e0: <span class='basic_pink'>0; 0<\/span><br\/> -a = -1 $\\Rightarrow $ a = 1<br\/>-a = 0 $\\Rightarrow $ a = 0<br\/>N\u00ean c\u00e1c s\u1ed1 c\u1ea7n \u0111i\u1ec1n v\u00e0o \u00f4 tr\u1ed1ng \u1edf h\u00e0ng th\u1ee9 nh\u1ea5t t\u1eeb tr\u00e1i qua ph\u1ea3i l\u1ea7n l\u01b0\u1ee3t l\u00e0: <span class='basic_pink'>1; 0<\/span><\/span> <br\/>"}]}],"id_ques":1107},{"time":24,"part":[{"title":"\u0110i\u1ec1n s\u1ed1 th\u00edch h\u1ee3p v\u00e0o \u00f4 tr\u1ed1ng","title_trans":"","temp":"fill_the_blank","correct":[[["2"," 2","+2","+ 2"," 2 "],["-3"," -3"," -3 ","- 3"],["0"," 0"," 0 "],["0"," 0"," 0 "]]],"list":[{"point":5,"width":50,"type_input":"","ques":"<table><tr><th>a<\/th><th>_input_<\/th><th>_input_<\/th><\/tr><tr><td>-a<\/td><td>-2<\/td><td>3<\/td><\/tr><tr><td>a + (-a)<\/td><td>_input_<\/td><td>_input_<\/td><\/tr><\/table>","hint":"","explain":"<span class='basic_left'><span class='basic_green'>H\u01b0\u1edbng d\u1eabn:<\/span><br\/>+ a v\u00e0 -a l\u00e0 hai s\u1ed1 nguy\u00ean \u0111\u1ed1i nhau<br\/>+ T\u1ed5ng c\u1ee7a hai s\u1ed1 nguy\u00ean \u0111\u1ed1i nhau lu\u00f4n b\u1eb1ng 0<br\/> <b>a + (-a) = 0<\/b><\/span> <br\/><br\/><span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span><br\/>Ta c\u00f3: a + (-a) = 0<br\/>N\u00ean c\u00e1c s\u1ed1 c\u1ea7n \u0111i\u1ec1n v\u00e0o \u00f4 tr\u1ed1ng \u1edf h\u00e0ng th\u1ee9 3 t\u1eeb tr\u00e1i qua ph\u1ea3i l\u1ea7n l\u01b0\u1ee3t l\u00e0: <span class='basic_pink'>0; 0<\/span><br\/> -a = -2 $\\Rightarrow $ a = 2<br\/>-a = 3 $\\Rightarrow $ a = -3<br\/>N\u00ean c\u00e1c s\u1ed1 c\u1ea7n \u0111i\u1ec1n v\u00e0o \u00f4 tr\u1ed1ng \u1edf h\u00e0ng th\u1ee9 nh\u1ea5t t\u1eeb tr\u00e1i qua ph\u1ea3i l\u1ea7n l\u01b0\u1ee3t l\u00e0: <span class='basic_pink'>2; -3<\/span><\/span> <br\/>"}]}],"id_ques":1108},{"time":9,"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 gi\u00e1 tr\u1ecb bi\u1ec3u th\u1ee9c: A = (-120) - (-315)","select":["A = 195","A = -195","A = 435","A = -435"],"hint":"","explain":" <span class='basic_left'><span class='basic_green'>H\u01b0\u1edbng d\u1eabn:<\/span><br\/> Mu\u1ed1n tr\u1eeb s\u1ed1 nguy\u00ean a cho s\u1ed1 nguy\u00ean b, ta c\u1ed9ng a v\u1edbi s\u1ed1 \u0111\u1ed1i c\u1ee7a b<\/span> <br\/><br\/><span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span><br\/>$\\begin{align*}A&= (-120) - (-315) \\\\A&= (-120) + 315\\\\A&= 315 - 120\\\\A&= 195\\end{align*}$<br\/>V\u1eady ta ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0: <span class='basic_pink'> A = 195<\/span><\/span> <br\/>","column":2}]}],"id_ques":1109},{"time":9,"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 gi\u00e1 tr\u1ecb bi\u1ec3u th\u1ee9c: A = (-180) - (-180)","select":["A = 0","A = -360","A = 360"],"hint":"","explain":" <span class='basic_left'><span class='basic_green'>H\u01b0\u1edbng d\u1eabn:<\/span><br\/> Mu\u1ed1n tr\u1eeb s\u1ed1 nguy\u00ean a cho s\u1ed1 nguy\u00ean b, ta c\u1ed9ng a v\u1edbi s\u1ed1 \u0111\u1ed1i c\u1ee7a b<\/span> <br\/><br\/><span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span><br\/>$\\begin{align*}A&= (-180) - (-180) \\\\A&= (-180) + 180\\\\A&= 0\\end{align*}$<br\/>V\u1eady ta ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0: <span class='basic_pink'> A = 0<\/span><\/span> <br\/>","column":3}]}],"id_ques":1110}],"lesson":{"save":0,"level":1}}