{"segment":[{"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\u00ednh. <br\/> $\\dfrac{65}{91} + \\dfrac{-33}{55}$ = ","select":["A. $\\dfrac{-46}{35}$ ","B. $\\dfrac{46}{35}$","C. $\\dfrac{4}{35}$","D. $\\dfrac{-4}{35}$ "],"hint":"R\u00fat g\u1ecdn sau \u0111\u00f3 quy \u0111\u1ed3ng v\u00e0 th\u1ef1c hi\u1ec7n ph\u00e9p t\u00ednh","explain":"<span class='basic_left'><span class='basic_green'>H\u01b0\u1edbng d\u1eabn:<\/span><br\/> <b> B\u01b0\u1edbc 1: <\/b> R\u00fat g\u1ecdn c\u00e1c ph\u00e2n s\u1ed1 $\\dfrac{65}{91}; \\dfrac{-33}{55}$ \u0111\u1ebfn t\u1ed1i gi\u1ea3n <br\/> <b> B\u01b0\u1edbc 2: <\/b> Quy \u0111\u1ed3ng m\u1eabu s\u1ed1 c\u00e1c ph\u00e2n s\u1ed1 sau khi r\u00fat g\u1ecdn <br\/> <b> B\u01b0\u1edbc 3: <\/b> Th\u1ef1c hi\u1ec7n c\u1ed9ng hai ph\u00e2n s\u1ed1 c\u00f9ng m\u1eabu ta c\u1ed9ng t\u1eed s\u1ed1 v\u1edbi t\u1eed s\u1ed1, gi\u1eef nguy\u00ean m\u1eabu s\u1ed1 <\/span> <br\/><br\/><span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span> <br\/> $\\begin{align*} \\dfrac{65}{91} + \\dfrac{-33}{91} &= \\dfrac{65 : 13}{91 : 13} + \\dfrac{-33 : 11}{55 : 11} \\\\ &= \\dfrac{5}{7} + \\dfrac{-3}{5} \\\\ &= \\dfrac{5 . 5}{7 . 5} + \\dfrac{-3 . 7}{5 . 7} \\\\ &= \\dfrac{25}{35} + \\dfrac{-21}{35} \\\\ &= \\dfrac{25 + (-21)}{35} \\\\ &= \\dfrac{4}{35} \\end{align*}$ <br\/> <span class='basic_pink'> V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0: C <\/span> ","column":4}]}],"id_ques":1551},{"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. <br\/> $\\dfrac{-650}{1430} + \\dfrac{588}{686}$ = ","select":["A. $\\dfrac{-31}{77}$ ","B. $\\dfrac{31}{77}$","C. $\\dfrac{101}{77}$","D. $\\dfrac{-101}{77}$ "],"hint":"R\u00fat g\u1ecdn sau \u0111\u00f3 quy \u0111\u1ed3ng v\u00e0 th\u1ef1c hi\u1ec7n ph\u00e9p t\u00ednh","explain":"<span class='basic_left'><span class='basic_green'>H\u01b0\u1edbng d\u1eabn:<\/span><br\/> <b> B\u01b0\u1edbc 1: <\/b> R\u00fat g\u1ecdn c\u00e1c ph\u00e2n s\u1ed1 $\\dfrac{-650}{1430}; \\dfrac{588}{686}$ \u0111\u1ebfn t\u1ed1i gi\u1ea3n <br\/> <b> B\u01b0\u1edbc 2: <\/b> Quy \u0111\u1ed3ng m\u1eabu s\u1ed1 c\u00e1c ph\u00e2n s\u1ed1 sau khi r\u00fat g\u1ecdn <br\/> <b> B\u01b0\u1edbc 3: <\/b> Th\u1ef1c hi\u1ec7n c\u1ed9ng hai ph\u00e2n s\u1ed1 c\u00f9ng m\u1eabu ta c\u1ed9ng t\u1eed s\u1ed1 v\u1edbi t\u1eed s\u1ed1, gi\u1eef nguy\u00ean m\u1eabu s\u1ed1 <\/span> <br\/><br\/><span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span> <br\/> $\\begin{align*} \\dfrac{-650}{1430} + \\dfrac{588}{686} &= \\dfrac{-650 : 130}{1430 : 130} + \\dfrac{588 : 98}{686 : 98} \\\\ &= \\dfrac{-5}{11} + \\dfrac{6}{7} \\\\ &= \\dfrac{-5 . 7}{11 . 5} + \\dfrac{6 . 11}{7 . 11} \\\\ &= \\dfrac{-35}{77} + \\dfrac{66}{77} \\\\ &= \\dfrac{-35 + 66}{77} \\\\ &= \\dfrac{31}{77} \\end{align*}$ <br\/> <span class='basic_pink'> V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0: B <\/span> ","column":4}]}],"id_ques":1552},{"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. <br\/> $\\dfrac{36}{-84} + \\dfrac{100}{450}$ = ","select":["A. $\\dfrac{-13}{63}$ ","B. $\\dfrac{13}{63}$","C. $\\dfrac{41}{63}$","D. $\\dfrac{-41}{63}$ "],"hint":"","explain":"<span class='basic_left'><span class='basic_green'>H\u01b0\u1edbng d\u1eabn:<\/span><br\/> <b> B\u01b0\u1edbc 1: <\/b> \u0110\u01b0a ph\u00e2n s\u1ed1 $\\dfrac{36}{-84}$ v\u1ec1 ph\u00e2n s\u1ed1 c\u00f3 m\u1eabu d\u01b0\u01a1ng <br\/> R\u00fat g\u1ecdn c\u00e1c ph\u00e2n s\u1ed1 \u0111\u1ebfn t\u1ed1i gi\u1ea3n <br\/> <b> B\u01b0\u1edbc 2: <\/b> Quy \u0111\u1ed3ng m\u1eabu s\u1ed1 c\u00e1c ph\u00e2n s\u1ed1 <br\/> <b> B\u01b0\u1edbc 3: <\/b> Th\u1ef1c hi\u1ec7n c\u1ed9ng hai ph\u00e2n s\u1ed1 c\u00f9ng m\u1eabu ta c\u1ed9ng t\u1eed s\u1ed1 v\u1edbi t\u1eed s\u1ed1, gi\u1eef nguy\u00ean m\u1eabu s\u1ed1 <\/span> <br\/><br\/><span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span> <br\/> $\\begin{align*} \\dfrac{36}{-84} + \\dfrac{100}{450} &= \\dfrac{36 : (-12)}{-84 : (-12)} + \\dfrac{100 : 50}{450 : 50} \\\\ &= \\dfrac{-3}{7} + \\dfrac{2}{9} \\\\ &= \\dfrac{-3 . 9}{7 . 9} + \\dfrac{2 . 7}{9 . 7} \\\\ &= \\dfrac{-27}{63} + \\dfrac{14}{63} \\\\ &= \\dfrac{-27 + 14}{63} \\\\ &= \\dfrac{-13}{63} \\end{align*}$ <br\/> <span class='basic_pink'> V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0: A <\/span> ","column":4}]}],"id_ques":1553},{"time":24,"part":[{"title":"\u0110i\u1ec1n \u0111\u00e1p \u00e1n \u0111\u00fang v\u00e0o \u00f4 tr\u1ed1ng","title_trans":"","temp":"fill_the_blank","correct":[[["<"]]],"list":[{"point":5,"width":50,"type_input":"","ques":"H\u00e3y \u0111i\u1ec1n d\u1ea5u (>, < ho\u1eb7c =) th\u00edch h\u1ee3p v\u00e0o \u00f4 tr\u1ed1ng. <br\/> $\\dfrac{-4}{11} + \\dfrac{7}{-11} $ _input_ 1 ","hint":"","explain":"<span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span><br\/> Ta c\u00f3: <br\/> $\\dfrac{-4}{11} + \\dfrac{7}{-11} = \\dfrac{-4}{11} + \\dfrac{7 . (-1)}{-11 . (-1)} = \\dfrac{-4}{11} + \\dfrac{-7}{11} = \\dfrac{-4 + (-7)}{11} = -1$ <br\/> V\u00ec -1 < 1 n\u00ean $\\dfrac{-4}{7} + \\dfrac{7}{-11} < 1$ <br\/> <span class='basic_pink'>V\u1eady d\u1ea5u c\u1ea7n \u0111i\u1ec1n l\u00e0: < <\/span> "}]}],"id_ques":1554},{"time":24,"part":[{"title":"\u0110i\u1ec1n \u0111\u00e1p \u00e1n \u0111\u00fang v\u00e0o \u00f4 tr\u1ed1ng","title_trans":"","temp":"fill_the_blank","correct":[[[">"]]],"list":[{"point":5,"width":50,"type_input":"","ques":"H\u00e3y \u0111i\u1ec1n d\u1ea5u (>, < ho\u1eb7c =) th\u00edch h\u1ee3p v\u00e0o \u00f4 tr\u1ed1ng. <br\/> $\\dfrac{3}{2} + 1 $ _input_ 2 ","hint":"","explain":"<span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span><br\/> Ta c\u00f3: <br\/> $\\dfrac{3}{2} + 1 = \\dfrac{3}{2} + \\dfrac{2}{2} = \\dfrac{3 + 2}{2} = \\dfrac{5}{2} = 2 \\dfrac{1}{2}$ <br\/> V\u00ec $2 \\dfrac{1}{2} > 2$ n\u00ean $\\dfrac{3}{2} + 1 > 2 $ <br\/> <span class='basic_pink'> V\u1eady d\u1ea5u c\u1ea7n \u0111i\u1ec1n l\u00e0: > <\/span> "}]}],"id_ques":1555},{"time":24,"part":[{"title":"\u0110i\u1ec1n \u0111\u00e1p \u00e1n \u0111\u00fang v\u00e0o \u00f4 tr\u1ed1ng","title_trans":"","temp":"fill_the_blank","correct":[[[">"]]],"list":[{"point":5,"width":50,"type_input":"","ques":"H\u00e3y \u0111i\u1ec1n d\u1ea5u (>, < ho\u1eb7c =) th\u00edch h\u1ee3p v\u00e0o \u00f4 tr\u1ed1ng. <br\/> $\\dfrac{4}{5} + \\dfrac{8}{9} $ _input_ $\\dfrac{14}{15}$ ","hint":"","explain":"<span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span><br\/> Ta c\u00f3: <br\/> $\\dfrac{4}{5} + \\dfrac{8}{9} = \\dfrac{4 . 9}{5 . 9} + \\dfrac{8 . 5}{9 . 5} = \\dfrac{36}{45} + \\dfrac{40}{45} = \\dfrac{36 + 40}{45} = \\dfrac{76}{45} = 1 \\dfrac{31}{45}$ <br\/> V\u00ec $\\dfrac{14}{15} < 1$ m\u00e0 $1 \\dfrac{31}{45} > 1$ n\u00ean $1 \\dfrac{31}{45} > \\dfrac{14}{15} $ <br\/> $\\Rightarrow$ $\\dfrac{4}{5} + \\dfrac{8}{9} > \\dfrac{14}{15}$ <br\/> <span class='basic_pink'> V\u1eady d\u1ea5u c\u1ea7n \u0111i\u1ec1n l\u00e0: > <\/span> "}]}],"id_ques":1556},{"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 $x = \\dfrac{2}{5} + \\dfrac{3}{4}$ ","select":["A. $x = \\dfrac{23}{20}$ ","B. $x = \\dfrac{13}{20}$","C. $x = \\dfrac{1}{2}$","D. $x = \\dfrac{11}{10}$ "],"hint":"","explain":"<span class='basic_left'><span class='basic_green'>H\u01b0\u1edbng d\u1eabn:<\/span><br\/> <b> B\u01b0\u1edbc 1: <\/b> Quy \u0111\u1ed3ng m\u1eabu s\u1ed1 hai ph\u00e2n s\u1ed1 $\\dfrac{2}{5}$; $\\dfrac{3}{4}$ <br\/> <b> B\u01b0\u1edbc 2: <\/b> Th\u1ef1c hi\u1ec7n c\u1ed9ng hai ph\u00e2n s\u1ed1 c\u00f9ng m\u1eabu <\/span> <br\/><br\/><span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span> <br\/> $\\begin{align*}x = \\dfrac{2}{5} + \\dfrac{3}{4} &= \\dfrac{2 . 4}{5 . 4} + \\dfrac{3 . 5}{4 . 5} \\\\ &= \\dfrac{8}{20} + \\dfrac{15}{20} \\\\ &= \\dfrac{8 + 15}{20} \\\\ &= \\dfrac{23}{20} \\end{align*}$ <br\/> <span class='basic_pink'> V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0: A. $\\dfrac{23}{20}$ <\/span> ","column":2}]}],"id_ques":1557},{"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 $x = \\dfrac{-11}{85} + \\dfrac{21}{40}$ ","select":["A. $x = \\dfrac{-269}{680}$ ","B. $x = \\dfrac{269}{680}$","C. $x = \\dfrac{89}{136}$","D. $x = \\dfrac{-89}{136}$ "],"hint":"","explain":"<span class='basic_left'><span class='basic_green'>H\u01b0\u1edbng d\u1eabn:<\/span><br\/> <b> B\u01b0\u1edbc 1: <\/b> Quy \u0111\u1ed3ng m\u1eabu s\u1ed1 hai ph\u00e2n s\u1ed1 $\\dfrac{-11}{85}$; $\\dfrac{21}{40}$ <br\/> <b> B\u01b0\u1edbc 2: <\/b> Th\u1ef1c hi\u1ec7n c\u1ed9ng hai ph\u00e2n s\u1ed1 c\u00f9ng m\u1eabu <\/span> <br\/><br\/><span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span> <br\/> $\\begin{align*}x = \\dfrac{-11}{85} + \\dfrac{21}{40} &= \\dfrac{-11 . 8}{85 . 8} + \\dfrac{21 . 17}{40 . 17} \\\\ &= \\dfrac{-88}{680} + \\dfrac{357}{680} \\\\ &= \\dfrac{-88 + 357}{680} \\\\ &= \\dfrac{269}{680} \\end{align*}$ <br\/> <span class='basic_pink'> V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0: B. $\\dfrac{269}{680}$ <\/span> ","column":2}]}],"id_ques":1558},{"time":24,"part":[{"title":"\u0110i\u1ec1n \u0111\u00e1p \u00e1n \u0111\u00fang v\u00e0o \u00f4 tr\u1ed1ng","title_trans":"","temp":"fill_the_blank","correct":[[["-8"],["27"]]],"list":[{"point":5,"width":50,"ques":"H\u00e3y \u0111i\u1ec1n ph\u00e2n s\u1ed1 th\u00edch h\u1ee3p v\u00e0o \u00f4 tr\u1ed1ng <br\/> $\\dfrac{-8}{27} + \\dfrac{-7}{27} = \\dfrac{-7}{27}$ + <div class=\"frac123\"><div class=\"ts\">_input_<\/div><div class=\"ms\">_input_<\/div><\/div>","hint":"\u00c1p d\u1ee5ng t\u00ednh ch\u1ea5t giao ho\u00e1n","explain":" <span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span><br\/>Theo t\u00ednh ch\u1ea5t giao ho\u00e1n c\u1ee7a ph\u00e9p c\u1ed9ng ph\u00e2n s\u1ed1 ta c\u00f3: <br\/> $\\dfrac{-8}{27} + \\dfrac{-7}{27} = \\dfrac{-7}{27} + \\dfrac{-8}{27}$"}]}],"id_ques":1559},{"time":24,"part":[{"title":"\u0110i\u1ec1n \u0111\u00e1p \u00e1n \u0111\u00fang v\u00e0o \u00f4 tr\u1ed1ng","title_trans":"","temp":"fill_the_blank","correct":[[["-1"],["9"]]],"list":[{"point":5,"width":50,"ques":"H\u00e3y \u0111i\u1ec1n ph\u00e2n s\u1ed1 th\u00edch h\u1ee3p v\u00e0o \u00f4 tr\u1ed1ng <br\/> $\\dfrac{-1}{9} + \\dfrac{7}{9} = \\dfrac{7}{9}$ + <div class=\"frac123\"><div class=\"ts\">_input_<\/div><div class=\"ms\">_input_<\/div><\/div>","hint":"\u00c1p d\u1ee5ng t\u00ednh ch\u1ea5t giao ho\u00e1n","explain":" <span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span><br\/>Theo t\u00ednh ch\u1ea5t giao ho\u00e1n c\u1ee7a ph\u00e9p c\u1ed9ng ph\u00e2n s\u1ed1 ta c\u00f3: <br\/> $\\dfrac{-1}{9} + \\dfrac{7}{9} = \\dfrac{7}{9} + \\dfrac{-1}{9}$ "}]}],"id_ques":1560},{"time":24,"part":[{"title":"\u0110i\u1ec1n \u0111\u00e1p \u00e1n \u0111\u00fang v\u00e0o \u00f4 tr\u1ed1ng","title_trans":"","temp":"fill_the_blank","correct":[[["-124"],["721"]]],"list":[{"point":5,"width":50,"ques":"H\u00e3y \u0111i\u1ec1n ph\u00e2n s\u1ed1 th\u00edch h\u1ee3p v\u00e0o \u00f4 tr\u1ed1ng <br\/> $\\dfrac{-124}{721} + 0 $ = <div class=\"frac123\"><div class=\"ts\">_input_<\/div><div class=\"ms\">_input_<\/div><\/div>","hint":"\u00c1p d\u1ee5ng t\u00ednh ch\u1ea5t c\u1ed9ng v\u1edbi 0","explain":" <span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span><br\/> Theo t\u00ednh ch\u1ea5t c\u1ed9ng v\u1edbi 0 ta c\u00f3: <br\/> $\\dfrac{-124}{721} + 0 = \\dfrac{-124}{721}$"}]}],"id_ques":1561},{"time":24,"part":[{"title":"\u0110i\u1ec1n \u0111\u00e1p \u00e1n \u0111\u00fang v\u00e0o \u00f4 tr\u1ed1ng","title_trans":"","temp":"fill_the_blank","correct":[[["247"],["150"]]],"list":[{"point":5,"width":50,"ques":"H\u00e3y \u0111i\u1ec1n ph\u00e2n s\u1ed1 th\u00edch h\u1ee3p v\u00e0o \u00f4 tr\u1ed1ng <br\/> $\\dfrac{247}{150} + 0 $ = <div class=\"frac123\"><div class=\"ts\">_input_<\/div><div class=\"ms\">_input_<\/div><\/div>","hint":"\u00c1p d\u1ee5ng t\u00ednh ch\u1ea5t c\u1ed9ng v\u1edbi 0","explain":" <span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span><br\/> Theo t\u00ednh ch\u1ea5t c\u1ed9ng v\u1edbi 0 ta c\u00f3: <br\/> $\\dfrac{247}{150} + 0 = \\dfrac{247}{150}$"}]}],"id_ques":1562},{"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":"Hai v\u00f2i n\u01b0\u1edbc c\u00f9ng ch\u1ea3y v\u00e0o m\u1ed9t b\u1ec3 c\u1ea1n. N\u1ebfu ch\u1ea3y m\u1ed9t m\u00ecnh th\u00ec v\u00f2i A ch\u1ea3y 5 gi\u1edd m\u1edbi \u0111\u1ea7y b\u1ec3, v\u00f2i B ch\u1ea3y 4 gi\u1edd m\u1edbi \u0111\u1ea7y b\u1ec3. H\u1ecfi hai v\u00f2i c\u00f9ng ch\u1ea3y bao l\u00e2u th\u00ec \u0111\u1ea7y b\u1ec3? \u0110\u00e1p \u00e1n l\u00e0: ","select":["A. 6 gi\u1edd ","B. 9 gi\u1edd ","C. 8 gi\u1edd ","D. $\\dfrac{20}{9}$ gi\u1edd "],"hint":"","explain":"<span class='basic_left'><span class='basic_green'>H\u01b0\u1edbng d\u1eabn:<\/span><br\/> <b> B\u01b0\u1edbc 1: <\/b> T\u00ednh l\u01b0\u1ee3ng n\u01b0\u1edbc v\u00f2i A ch\u1ea3y trong 1 gi\u1edd <br\/> <b> B\u01b0\u1edbc 2: <\/b> T\u00ednh l\u01b0\u1ee3ng n\u01b0\u1edbc v\u00f2i B ch\u1ea3y trong 1 gi\u1edd <br\/> <b> B\u01b0\u1edbc 3: <\/b> T\u00ednh l\u01b0\u1ee3ng n\u01b0\u1edbc c\u1ea3 hai v\u00f2i ch\u1ea3y \u0111\u01b0\u1ee3c trong 1 gi\u1edd <br\/> <b> B\u01b0\u1edbc 4: <\/b> T\u00ednh th\u1eddi gian \u0111\u1ec3 c\u1ea3 hai v\u00f2i ch\u1ea3 \u0111\u1ea7y b\u1ec3 <\/span> <br\/><br\/><span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span> <br\/> M\u1ed9t gi\u1edd v\u00f2i A ch\u1ea3y \u0111\u01b0\u1ee3c s\u1ed1 ph\u1ea7n b\u1ec3 l\u00e0: <br\/> $1 : 5 = \\dfrac{1}{5}$ (b\u1ec3) <br\/> M\u1ed9t gi\u1edd v\u00f2i B ch\u1ea3y \u0111\u01b0\u1ee3c s\u1ed1 ph\u1ea7n b\u1ec3 l\u00e0: <br\/> $1 : 4 = \\dfrac{1}{4}$ (b\u1ec3) <br\/> M\u1ed9t gi\u1edd c\u1ea3 hai v\u00f2i ch\u1ea3y \u0111\u01b0\u1ee3c s\u1ed1 ph\u1ea7n b\u1ec3 l\u00e0: <br\/> $\\dfrac{1}{4} + \\dfrac{1}{5} = \\dfrac{9}{20}$ (b\u1ec3) <br\/> Th\u1eddi gian \u0111\u1ec3 c\u1ea3 hai v\u00f2i ch\u1ea3y \u0111\u1ea7y b\u1ec3 l\u00e0: <br\/> $1 : \\dfrac{9}{20} = \\dfrac{20}{9}$ (gi\u1edd) <br\/> V\u1eady n\u1ebfu c\u1ea3 hai v\u00f2i c\u00f9ng ch\u1ea3y $\\dfrac{20}{9}$ gi\u1edd th\u00ec \u0111\u1ea7y b\u1ec3 <br\/> <span class='basic_pink'> \u0110\u00e1p \u00e1n \u0111\u00fang l\u00e0: D. $\\dfrac{20}{9}$ gi\u1edd <\/span> ","column":2}]}],"id_ques":1563},{"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":"Ng\u00e0y \u0111\u1ea7u b\u1ea1n An \u0111\u1ecdc \u0111\u01b0\u1ee3c $\\dfrac{1}{4}$ quy\u1ec3n truy\u1ec7n, ng\u00e0y th\u1ee9 2 b\u1ea1n An \u0111\u1ecdc \u0111\u01b0\u1ee3c $\\dfrac{2}{3}$ quy\u1ec3n truy\u1ec7n. <br\/> V\u1eady c\u1ea3 hai ng\u00e0y b\u1ea1n An \u0111\u1ecdc \u0111\u01b0\u1ee3c l\u00e0: ","select":["A. $\\dfrac{11}{12}$ quy\u1ec3n truy\u1ec7n ","B. $\\dfrac{3}{7}$ quy\u1ec3n truy\u1ec7n ","C. $\\dfrac{3}{12}$ quy\u1ec3n truy\u1ec7n ","D. $\\dfrac{11}{7}$ quy\u1ec3n truy\u1ec7n "],"hint":"","explain":"<span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span> <br\/> C\u1ea3 hai ng\u00e0y b\u1ea1n An \u0111\u1ecdc \u0111\u01b0\u1ee3c l\u00e0: <br\/> $\\dfrac{1}{4} + \\dfrac{2}{3} = \\dfrac{11}{12}$ (quy\u1ec3n truy\u1ec7n) <br\/> <span class='basic_pink'> V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0: A. $\\dfrac{11}{12}$ quy\u1ec3n truy\u1ec7n <\/span> ","column":2}]}],"id_ques":1564},{"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":"M\u1ed9t v\u01b0\u1eddn hoa c\u00f3 $\\dfrac{1}{6}$ di\u1ec7n t\u00edch tr\u1ed3ng hoa Ly, $\\dfrac{3}{5}$ di\u1ec7n t\u00edch tr\u1ed3ng hoa C\u00fac. H\u1ecfi c\u1ea3 di\u1ec7n t\u00edch tr\u1ed3ng hoa Ly v\u00e0 hoa C\u00fac chi\u1ebfm bao nhi\u00eau ph\u1ea7n di\u1ec7n t\u00edch khu v\u01b0\u1eddn? <br\/> \u0110\u00e1p \u00e1n l\u00e0: ","select":["A. $\\dfrac{4}{11}$ di\u1ec7n t\u00edch khu v\u01b0\u1eddn ","B. $\\dfrac{23}{11}$ di\u1ec7n t\u00edch khu v\u01b0\u1eddn ","C. $\\dfrac{23}{30}$ di\u1ec7n t\u00edch khu v\u01b0\u1eddn ","D. $\\dfrac{4}{30}$ di\u1ec7n t\u00edch khu v\u01b0\u1eddn "],"hint":"","explain":"<span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span> <br\/> Di\u1ec7n t\u00edch tr\u1ed3ng hoa Ly v\u00e0 hoa C\u00fac chi\u1ebfm s\u1ed1 ph\u1ea7n di\u1ec7n t\u00edch khu v\u01b0\u1eddn l\u00e0: <br\/> $\\dfrac{1}{6} + \\dfrac{3}{5} = \\dfrac{23}{30}$ (di\u1ec7n t\u00edch khu v\u01b0\u1eddn) <br\/> <span class='basic_pink'> V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0: C. $\\dfrac{23}{30}$ di\u1ec7n t\u00edch khu v\u01b0\u1eddn <\/span> ","column":2}]}],"id_ques":1565},{"time":24,"part":[{"title":"\u0110i\u1ec1n \u0111\u00e1p \u00e1n \u0111\u00fang v\u00e0o \u00f4 tr\u1ed1ng","title_trans":"","temp":"fill_the_blank","correct":[[["62"],["35"]]],"list":[{"point":5,"width":50,"ques":"T\u00ednh. <br\/> $\\dfrac{4}{7} + \\dfrac{6}{5} $ = <div class=\"frac123\"><div class=\"ts\">_input_<\/div><div class=\"ms\">_input_<\/div><\/div>","hint":"Quy \u0111\u1ed3ng r\u1ed3i th\u1ef1c hi\u1ec7n ph\u00e9p t\u00ednh","explain":" <span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span><br\/> $\\begin{align*} \\dfrac{4}{7} + \\dfrac{6}{5} &= \\dfrac{4 . 5}{7 . 5} + \\dfrac{6 . 7}{5 . 7} \\\\ &= \\dfrac{20}{35} + \\dfrac{42}{35} \\\\ &= \\dfrac{20 + 42}{35} \\\\ &= \\dfrac{62}{35} \\end{align*}$"}]}],"id_ques":1566},{"time":24,"part":[{"title":"\u0110i\u1ec1n \u0111\u00e1p \u00e1n \u0111\u00fang v\u00e0o \u00f4 tr\u1ed1ng","title_trans":"","temp":"fill_the_blank","correct":[[["11"],["8"]]],"list":[{"point":5,"width":50,"ques":"T\u00ednh. <br\/> $\\dfrac{3}{4} + \\dfrac{5}{8} $ = <div class=\"frac123\"><div class=\"ts\">_input_<\/div><div class=\"ms\">_input_<\/div><\/div>","hint":"Quy \u0111\u1ed3ng r\u1ed3i th\u1ef1c hi\u1ec7n ph\u00e9p t\u00ednh","explain":" <span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span><br\/> $\\begin{align*} \\dfrac{3}{4} + \\dfrac{5}{8} &= \\dfrac{3 . 2}{4 . 2} + \\dfrac{5}{8} \\\\ &= \\dfrac{6}{8} + \\dfrac{5}{8} \\\\ &= \\dfrac{6 + 5}{8} \\\\ &= \\dfrac{11}{8} \\end{align*}$"}]}],"id_ques":1567},{"time":24,"part":[{"title":"\u0110i\u1ec1n \u0111\u00e1p \u00e1n \u0111\u00fang v\u00e0o \u00f4 tr\u1ed1ng","title_trans":"","temp":"fill_the_blank","correct":[[["4"],["2"]]],"list":[{"point":5,"width":50,"type_input":"","ques":"\u00c1p d\u1ee5ng t\u00ednh ch\u1ea5t k\u1ebft h\u1ee3p c\u1ee7a ph\u00e9p c\u1ed9ng h\u00e3y \u0111i\u1ec1n ph\u00e2n s\u1ed1 th\u00edch h\u1ee3p v\u00e0o \u00f4 tr\u1ed1ng <br\/> $\\dfrac{1}{2} + ( \\dfrac{4}{2} + \\dfrac{3}{5})$ =($\\dfrac{1}{2}$ + <div class=\"frac123\"><div class=\"ts\">_input_<\/div><div class=\"ms\">_input_<\/div><\/div> ) + $\\dfrac{3}{5}$ ","hint":"","explain":" <span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span><br\/> Theo t\u00ednh ch\u1ea5t k\u1ebft h\u1ee3p c\u1ee7a ph\u00e9p c\u1ed9ng ta c\u00f3: <br\/> $\\dfrac{1}{2} + \\left( \\dfrac{4}{2} + \\dfrac{3}{5} \\right) = \\left( \\dfrac{1}{2} + \\dfrac{4}{2} \\right) + \\dfrac{3}{5}$ <br\/> <span class='basic_pink'> V\u1eady ph\u00e2n s\u1ed1 c\u1ea7n \u0111i\u1ec1n l\u00e0: $\\dfrac{4}{2}$ <\/span> "}]}],"id_ques":1568},{"time":24,"part":[{"title":"\u0110i\u1ec1n \u0111\u00e1p \u00e1n \u0111\u00fang v\u00e0o \u00f4 tr\u1ed1ng","title_trans":"","temp":"fill_the_blank","correct":[[["4"],["11"]]],"list":[{"point":5,"width":50,"type_input":"","ques":"\u00c1p d\u1ee5ng t\u00ednh ch\u1ea5t k\u1ebft h\u1ee3p c\u1ee7a ph\u00e9p c\u1ed9ng h\u00e3y \u0111i\u1ec1n ph\u00e2n s\u1ed1 th\u00edch h\u1ee3p v\u00e0o \u00f4 tr\u1ed1ng <br\/> $( \\dfrac{3}{11} + \\dfrac{8}{9} ) + \\dfrac{4}{11} = \\dfrac{8}{9} + ( \\dfrac{3}{11}$ + <div class=\"frac123\"><div class=\"ts\">_input_<\/div><div class=\"ms\">_input_<\/div><\/div> )","hint":"","explain":" <span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span><br\/> Theo t\u00ednh ch\u1ea5t k\u1ebft h\u1ee3p c\u1ee7a ph\u00e9p c\u1ed9ng ta c\u00f3: <br\/> $\\left( \\dfrac{3}{11} + \\dfrac{8}{9} \\right) + \\dfrac{4}{11} = \\dfrac{8}{9} + \\left( \\dfrac{3}{11} + \\dfrac{4}{11} \\right)$ <br\/> <span class='basic_pink'> V\u1eady ph\u00e2n s\u1ed1 c\u1ea7n \u0111i\u1ec1n l\u00e0: $\\dfrac{4}{11}$ <\/span> "}]}],"id_ques":1569},{"time":24,"part":[{"title":"\u0110i\u1ec1n \u0111\u00e1p \u00e1n \u0111\u00fang v\u00e0o \u00f4 tr\u1ed1ng","title_trans":"","temp":"fill_the_blank","correct":[[["1"],["3"]]],"list":[{"point":5,"width":50,"type_input":"","ques":"\u00c1p d\u1ee5ng t\u00ednh ch\u1ea5t k\u1ebft h\u1ee3p c\u1ee7a ph\u00e9p c\u1ed9ng h\u00e3y \u0111i\u1ec1n ph\u00e2n s\u1ed1 th\u00edch h\u1ee3p v\u00e0o \u00f4 tr\u1ed1ng <br\/> $( \\dfrac{9}{15} + \\dfrac{6}{9}) + \\dfrac{4}{12} = \\dfrac{3}{5} + ( \\dfrac{2}{3} $+ <div class=\"frac123\"><div class=\"ts\">_input_<\/div><div class=\"ms\">_input_<\/div><\/div> ) ","hint":"","explain":" <span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span><br\/> Theo t\u00ednh ch\u1ea5t k\u1ebft h\u1ee3p c\u1ee7a ph\u00e9p c\u1ed9ng ta c\u00f3: <br\/> $\\left( \\dfrac{9}{15} + \\dfrac{6}{9} \\right) + \\dfrac{4}{12} = \\dfrac{3}{5} + \\dfrac{2}{3} + \\dfrac{1}{3} = \\dfrac{3}{5} + \\left( \\dfrac{2}{3} + \\dfrac{1}{3} \\right)$ <br\/> <span class='basic_pink'> V\u1eady ph\u00e2n s\u1ed1 c\u1ea7n \u0111i\u1ec1n l\u00e0: $\\dfrac{1}{3}$ <\/span> "}]}],"id_ques":1570}],"lesson":{"save":0,"level":1}}