{"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":"Quy \u0111\u1ed3ng m\u1eabu c\u00e1c ph\u00e2n s\u1ed1: $\\dfrac{7}{30}; \\dfrac{8}{45}; \\dfrac{-11}{90}$ ta \u0111\u01b0\u1ee3c c\u00e1c ph\u00e2n s\u1ed1:","select":["A. $\\dfrac{7}{90}; \\dfrac{16}{90}; \\dfrac{-11}{90} $ ","B. $\\dfrac{211}{90}; \\dfrac{-16}{90}; \\dfrac{-11}{90} $ ","C. $\\dfrac{21}{90}; \\dfrac{16}{90}; \\dfrac{-11}{90} $","D. $\\dfrac{-7}{90}; \\dfrac{-16}{90}; \\dfrac{-11}{90} $ "],"hint":"\u00c1p d\u1ee5ng quy t\u1eafc quy \u0111\u1ed3ng m\u1eabu c\u00e1c ph\u00e2n s\u1ed1","explain":"<span class='basic_left'><span class='basic_green'>H\u01b0\u1edbng d\u1eabn:<\/span><br\/> <b> B\u01b0\u1edbc 1: <\/b> T\u00ecm m\u1eabu s\u1ed1 chung (MSC) <br\/> MSC = BCNN(30, 45, 90) = ? <br\/> <b> B\u01b0\u1edbc 2: <\/b> T\u00ecm th\u1eeba s\u1ed1 ph\u1ee5 (TSP) c\u1ee7a c\u00e1c ph\u00e2n s\u1ed1: <br\/> Th\u1eeba s\u1ed1 ph\u1ee5 c\u1ee7a ph\u00e2n s\u1ed1: $\\dfrac{7}{30}$ l\u00e0: MSC : 30 = ? <br\/> T\u01b0\u01a1ng t\u1ef1 ta t\u00ecm th\u1eeba s\u1ed1 ph\u1ee5 c\u00e1c ph\u00e2n s\u1ed1 c\u00f2n l\u1ea1i <br\/> <b> B\u01b0\u1edbc 3: <\/b> Quy \u0111\u1ed3ng <br\/> $\\dfrac{7}{30} = \\dfrac{7 . TSP}{30 . TSP}$ c\u00e1c ph\u00e2n s\u1ed1 c\u00f2n l\u1ea1i ta l\u00e0m t\u01b0\u01a1ng t\u1ef1 <\/span> <br\/><br\/><span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span> <br\/> Ph\u00e2n t\u00edch c\u00e1c s\u1ed1 30, 45, 90 ra th\u1eeba s\u1ed1 nguy\u00ean t\u1ed1 ta \u0111\u01b0\u1ee3c: <br\/> $30 = 2 . 3 . 5$ <br\/> $45 = 3^2 . 5$ <br\/> $90 = 2 . 3^2 . 5$ <br\/> M\u1eabu s\u1ed1 chung = BCNN(30, 45, 90) = $2 . 3^2 . 5 = 90$ <br\/> Th\u1eeba s\u1ed1 ph\u1ee5: 90 : 30 = 3; 90 : 45 = 2 <br\/> Quy \u0111\u1ed3ng: <br\/> $\\dfrac{7}{30} = \\dfrac{7 . 3}{30 . 3} = \\dfrac{21}{90}$ <br\/> $\\dfrac{8}{45} = \\dfrac{8 . 2}{45 . 2} = \\dfrac{16}{90}$ <br\/> V\u1eady c\u00e1c ph\u00e2n s\u1ed1 $\\dfrac{7}{30}; \\dfrac{8}{45}; \\dfrac{-11}{90}$ sau khi quy \u0111\u1ed3ng ta \u0111\u01b0\u1ee3c c\u00e1c ph\u00e2n s\u1ed1 l\u00e0: $\\dfrac{21}{90}; \\dfrac{16}{90}; \\dfrac{-11}{90} $ <br\/> <span class='basic_pink'> V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0: C <\/span> ","column":2}]}],"id_ques":1501},{"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":"Quy \u0111\u1ed3ng m\u1eabu c\u00e1c ph\u00e2n s\u1ed1: $\\dfrac{-4}{5}; \\dfrac{1}{6}; \\dfrac{-9}{7}$ ta \u0111\u01b0\u1ee3c c\u00e1c ph\u00e2n s\u1ed1:","select":["A. $\\dfrac{168}{210}; \\dfrac{35}{210}; \\dfrac{270}{210} $ ","B. $\\dfrac{-168}{210}; \\dfrac{35}{210}; \\dfrac{-270}{210} $ ","C. $\\dfrac{-4}{210}; \\dfrac{35}{210}; \\dfrac{-9}{210} $","D. $\\dfrac{-41}{210}; \\dfrac{35}{210}; \\dfrac{-30}{210} $ "],"hint":"\u00c1p d\u1ee5ng quy t\u1eafc quy \u0111\u1ed3ng m\u1eabu c\u00e1c ph\u00e2n s\u1ed1","explain":"<span class='basic_left'><span class='basic_green'>H\u01b0\u1edbng d\u1eabn:<\/span><br\/> <b> B\u01b0\u1edbc 1: <\/b> T\u00ecm m\u1eabu s\u1ed1 chung (MSC) <br\/> MSC = BCNN(5, 6, 7) = ? <br\/> <b> B\u01b0\u1edbc 2: <\/b> T\u00ecm th\u1eeba s\u1ed1 ph\u1ee5 (TSP) c\u1ee7a c\u00e1c ph\u00e2n s\u1ed1: <br\/> Th\u1eeba s\u1ed1 ph\u1ee5 c\u1ee7a ph\u00e2n s\u1ed1: $\\dfrac{-4}{5}$ l\u00e0: MSC : 5 = ? <br\/> T\u01b0\u01a1ng t\u1ef1 ta t\u00ecm th\u1eeba s\u1ed1 ph\u1ee5 c\u00e1c ph\u00e2n s\u1ed1 c\u00f2n l\u1ea1i <br\/> <b> B\u01b0\u1edbc 3: <\/b> Quy \u0111\u1ed3ng <br\/> $\\dfrac{-4}{5} = \\dfrac{-4 . TSP}{5 . TSP}$ c\u00e1c ph\u00e2n s\u1ed1 c\u00f2n l\u1ea1i ta l\u00e0m t\u01b0\u01a1ng t\u1ef1 <\/span> <br\/><br\/><span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span> <br\/> M\u1eabu s\u1ed1 chung = BCNN(5, 6, 7) = $2 . 3 . 5 . 7 = 210$ <br\/> Th\u1eeba s\u1ed1 ph\u1ee5: 210 : 5 = 42; 210 : 6 = 35; 210 : 7 = 30 <br\/> Quy \u0111\u1ed3ng: <br\/> $\\dfrac{-4}{5} = \\dfrac{-4 . 42}{5 . 42} = \\dfrac{-168}{210}$ <br\/> $\\dfrac{1}{6} = \\dfrac{1 . 35}{6 . 35} = \\dfrac{35}{210}$ <br\/> $\\dfrac{-9}{7} = \\dfrac{-9 . 30}{7 . 30} = \\dfrac{-270}{210}$ <br\/> V\u1eady c\u00e1c ph\u00e2n s\u1ed1 $\\dfrac{-4}{5}; \\dfrac{1}{6}; \\dfrac{-9}{7}$ sau khi quy \u0111\u1ed3ng ta \u0111\u01b0\u1ee3c c\u00e1c ph\u00e2n s\u1ed1 l\u00e0: $\\dfrac{-168}{210}; \\dfrac{35}{210}; \\dfrac{-270}{210} $ <br\/> <span class='basic_pink'> V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0: B <\/span> ","column":2}]}],"id_ques":1502},{"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":"Quy \u0111\u1ed3ng m\u1eabu c\u00e1c ph\u00e2n s\u1ed1: $\\dfrac{5}{14}; \\dfrac{13}{21}; \\dfrac{20}{49}$ ta \u0111\u01b0\u1ee3c c\u00e1c ph\u00e2n s\u1ed1:","select":["A. $\\dfrac{105}{294}; \\dfrac{182}{294}; \\dfrac{120}{294} $ ","B. $\\dfrac{-105}{294}; \\dfrac{-182}{294}; \\dfrac{120}{294} $ ","C. $\\dfrac{21}{294}; \\dfrac{182}{294}; \\dfrac{120}{294} $","D. $\\dfrac{211}{294}; \\dfrac{14}{294}; \\dfrac{120}{294} $ "],"hint":"\u00c1p d\u1ee5ng quy t\u1eafc quy \u0111\u1ed3ng m\u1eabu c\u00e1c ph\u00e2n s\u1ed1","explain":"<span class='basic_left'><span class='basic_green'>H\u01b0\u1edbng d\u1eabn:<\/span><br\/> <b> B\u01b0\u1edbc 1: <\/b> T\u00ecm m\u1eabu s\u1ed1 chung (MSC) <br\/> MSC = BCNN(14, 21, 49) = ? <br\/> <b> B\u01b0\u1edbc 2: <\/b> T\u00ecm th\u1eeba s\u1ed1 ph\u1ee5 (TSP) c\u1ee7a c\u00e1c ph\u00e2n s\u1ed1: <br\/> Th\u1eeba s\u1ed1 ph\u1ee5 c\u1ee7a ph\u00e2n s\u1ed1: $\\dfrac{5}{14}$ l\u00e0: MSC : 14 = ? <br\/> T\u01b0\u01a1ng t\u1ef1 ta t\u00ecm th\u1eeba s\u1ed1 ph\u1ee5 c\u00e1c ph\u00e2n s\u1ed1 c\u00f2n l\u1ea1i <br\/> <b> B\u01b0\u1edbc 3: <\/b> Quy \u0111\u1ed3ng <br\/> $\\dfrac{5}{14} = \\dfrac{5 . TSP}{14 . TSP}$ c\u00e1c ph\u00e2n s\u1ed1 c\u00f2n l\u1ea1i ta l\u00e0m t\u01b0\u01a1ng t\u1ef1 <\/span> <br\/><br\/><span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span> <br\/> Ph\u00e2n t\u00edch c\u00e1c s\u1ed1 14, 21, 49 ra th\u1eeba s\u1ed1 nguy\u00ean t\u1ed1 ta \u0111\u01b0\u1ee3c: <br\/> $14 = 2 . 7$ <br\/> $21 = 3 . 7$ <br\/> $49 = 7^2$ <br\/> M\u1eabu s\u1ed1 chung = BCNN(14, 21, 49) = $2 . 3 . 7^2 = 294$ <br\/> Th\u1eeba s\u1ed1 ph\u1ee5: 294 : 14 = 21; 294 : 21 = 14; 294 : 49 = 6 <br\/> Quy \u0111\u1ed3ng: <br\/> $\\dfrac{5}{14} = \\dfrac{5 . 21}{14 . 21} = \\dfrac{105}{294}$ <br\/> $\\dfrac{13}{21} = \\dfrac{13 . 14}{21 . 14} = \\dfrac{182}{294}$ <br\/> $\\dfrac{20}{49} = \\dfrac{20 . 6}{49 . 6} = \\dfrac{120}{294}$ <br\/> V\u1eady c\u00e1c ph\u00e2n s\u1ed1 $\\dfrac{5}{14}; \\dfrac{13}{21}; \\dfrac{20}{49}$ sau khi quy \u0111\u1ed3ng ta \u0111\u01b0\u1ee3c c\u00e1c ph\u00e2n s\u1ed1 l\u00e0: $\\dfrac{105}{294}; \\dfrac{182}{294}; \\dfrac{120}{294} $ <br\/> <span class='basic_pink'> V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0: A <\/span> ","column":2}]}],"id_ques":1503},{"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":"M\u1eabu chung nh\u1ecf nh\u1ea5t c\u1ee7a c\u00e1c ph\u00e2n s\u1ed1 $\\dfrac{-5}{17}; \\dfrac{3}{-24}; \\dfrac{-24}{-64}$ l\u00e0: ","select":["A. 136 ","B. 170 ","C. 102","D. 204"],"hint":"R\u00fat g\u1ecdn v\u1ec1 ph\u00e2n s\u1ed1 t\u1ed1i gi\u1ea3n r\u1ed3i m\u1edbi t\u00ecm MSC nh\u1ecf nh\u1ea5t","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 ph\u00e2n s\u1ed1 n\u00e0o ch\u01b0a t\u1ed1i gi\u1ea3n <br\/> \u0110\u01b0a c\u00e1c ph\u00e2n s\u1ed1 c\u00f3 m\u1eabu \u00e2m v\u1ec1 m\u1eabu d\u01b0\u01a1ng <br\/> <b> B\u01b0\u1edbc 2: <\/b> MSC nh\u1ecf nh\u1ea5t = BCNN(17, 24, 64) = ? <\/span> <br\/><br\/><span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span> <br\/> $\\dfrac{3}{-24} = \\dfrac{3}{-24} = \\dfrac{3 : (-3)}{-24 : (-3)} = \\dfrac{-1}{8}$ <br\/> $\\dfrac{-24}{-64} = \\dfrac{-24 : (-8)}{-64 : (-8)} = \\dfrac{3}{8}$ <br\/> BCNN(17, 8) = 136 <br\/> V\u1eady m\u1eabu s\u1ed1 chung nh\u1ecf nh\u1ea5t c\u1ee7a c\u00e1c ph\u00e2n s\u1ed1 $\\dfrac{-5}{17}; \\dfrac{-1}{8}; \\dfrac{3}{8}$ l\u00e0 136 <br\/> <span class='basic_pink'> V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0: A. 136 <\/span> ","column":2}]}],"id_ques":1504},{"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":"M\u1eabu chung nh\u1ecf nh\u1ea5t c\u1ee7a c\u00e1c ph\u00e2n s\u1ed1 $\\dfrac{-1}{3}; \\dfrac{2}{7}; \\dfrac{-8}{9}$ l\u00e0: ","select":["A. 84 ","B. 63 ","C. 73","D. 168"],"hint":"","explain":"<span class='basic_left'><span class='basic_green'>H\u01b0\u1edbng d\u1eabn:<\/span><br\/> <b> B\u01b0\u1edbc 1: <\/b> Ph\u00e2n t\u00edch c\u00e1c m\u1eabu s\u1ed1 ra th\u1eeba s\u1ed1 nguy\u00ean t\u1ed1 <br\/> <b> B\u01b0\u1edbc 2: <\/b> MSC nh\u1ecf nh\u1ea5t = BCNN(3, 7, 9) = ? <\/span> <br\/><br\/><span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span> <br\/> Ph\u00e2n t\u00edch c\u00e1c s\u1ed1 3, 7, 9 ra th\u1eeba s\u1ed1 nguy\u00ean t\u1ed1 ta \u0111\u01b0\u1ee3c: $9 = 3^2$ <br\/> BCNN(3, 7, 9) = $3^2 . 7 = 63$ <br\/> V\u1eady m\u1eabu s\u1ed1 chung nh\u1ecf nh\u1ea5t c\u1ee7a c\u00e1c ph\u00e2n s\u1ed1 $\\dfrac{-1}{3}; \\dfrac{2}{7}; \\dfrac{-8}{9}$ l\u00e0 63 <br\/> <span class='basic_pink'> V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0: B. 63 <\/span> ","column":2}]}],"id_ques":1505},{"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\u1eabu chung nh\u1ecf nh\u1ea5t c\u1ee7a c\u00e1c ph\u00e2n s\u1ed1 $\\dfrac{1}{11}; \\dfrac{1}{12}; \\dfrac{5}{132}$ l\u00e0: ","select":["A. 198 ","B. 143","C. 132","D. 121"],"hint":"","explain":"<span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span> <br\/> V\u00ec 132 $\\vdots$ 11; 132 $\\vdots$ 12 <br\/> $\\Rightarrow$ M\u1eabu s\u1ed1 chung nh\u1ecf nh\u1ea5t c\u1ee7a $\\dfrac{1}{11}; \\dfrac{1}{12}; \\dfrac{5}{132}$ l\u00e0 132 <br\/> <span class='basic_pink'> V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0: C. 132 <\/span> ","column":2}]}],"id_ques":1506},{"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\/> $\\dfrac{5}{7}$ _input_ $\\dfrac{9}{11}$","hint":"Quy \u0111\u1ed3ng r\u1ed3i so s\u00e1nh","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 tr\u00ean <br\/> <b> B\u01b0\u1edbc 2: <\/b> So s\u00e1nh hai ph\u00e2n s\u1ed1 c\u00f9ng m\u1eabu, ph\u00e2n s\u1ed1 n\u00e0o c\u00f3 t\u1eed s\u1ed1 l\u1edbn h\u01a1n th\u00ec l\u1edbn h\u01a1n <\/span> <br\/><br\/> <span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span><br\/> MSC = 7 . 11 = 77 <br\/> $\\dfrac{5}{7} = \\dfrac{5 . 11}{7 . 11} = \\dfrac{55}{77}$ <br\/> $\\dfrac{9}{11} = \\dfrac{9 . 7}{11 . 7} = \\dfrac{63}{77}$ <br\/> V\u00ec $\\dfrac{55}{77} < \\dfrac{63}{77}$ $\\Rightarrow$ $\\dfrac{5}{7} < \\dfrac{9}{11}$ <br\/> <span class='basic_pink'>V\u1eady d\u1ea5u c\u1ea7n \u0111i\u1ec1n l\u00e0: < <\/span> "}]}],"id_ques":1507},{"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\/> $\\dfrac{33}{143}$ _input_ $\\dfrac{-12}{36}$","hint":"","explain":" <span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span><br\/> V\u00ec $\\dfrac{33}{143}$ > 0; $\\dfrac{-12}{36} < 0$ <br\/> $\\Rightarrow$ $\\dfrac{33}{143} > \\dfrac{-12}{36}$ <br\/> <span class='basic_pink'>V\u1eady d\u1ea5u c\u1ea7n \u0111i\u1ec1n l\u00e0: > <\/span> <br\/> <span class='basic_green'> <i> Nh\u1eadn x\u00e9t: Khi so s\u00e1nh hai ph\u00e2n s\u1ed1, n\u1ebfu c\u00f3 m\u1ed9t ph\u00e2n s\u1ed1 mang d\u1ea5u d\u01b0\u01a1ng v\u00e0 m\u1ed9t ph\u00e2n s\u1ed1 mang d\u1ea5u \u00e2m th\u00ec ph\u00e2n s\u1ed1 d\u01b0\u01a1ng l\u1edbn h\u01a1n ph\u00e2n s\u1ed1 \u00e2m <\/i><\/span> "}]}],"id_ques":1508},{"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\/> $\\dfrac{-12}{81}$ _input_ $\\dfrac{25}{-30}$","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 v\u1ec1 m\u1eabu d\u01b0\u01a1ng v\u00e0 r\u00fat g\u1ecdn v\u1ec1 ph\u00e2n s\u1ed1 t\u1ed1i gi\u1ea3n <br\/> <b> B\u01b0\u1edbc 2: <\/b> Quy \u0111\u1ed3ng m\u1eabu hai ph\u00e2n s\u1ed1 <br\/> <b> B\u01b0\u1edbc 3: <\/b> So s\u00e1nh hai ph\u00e2n s\u1ed1 tr\u00ean <\/span> <br\/><br\/> <span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span><br\/> Ta c\u00f3: <br\/> $\\dfrac{25}{-30} = \\dfrac{25 . (-1)}{-30 . (-1)} = \\dfrac{-25}{30} = \\dfrac{-25 : 5}{30 : 5} = \\dfrac{-5}{6}$ <br\/> $\\dfrac{-12}{81} = \\dfrac{-12 : 3}{81 : 3} = \\dfrac{-4}{27}$ <br\/> Quy \u0111\u1ed3ng: $\\dfrac{-5}{6} = \\dfrac{-5 . 9}{6 . 9} = \\dfrac{-45}{54}$ <br\/> $\\dfrac{-4}{27} = \\dfrac{-4 . 2}{27 . 2} = \\dfrac{-8}{54}$ <br\/> V\u00ec $\\dfrac{-8}{54} > \\dfrac{-45}{54}$ $\\Rightarrow$ $\\dfrac{-4}{27} > \\dfrac{-5}{6}$ <br\/> Hay: $\\dfrac{-12}{81} > \\dfrac{25}{-30}$ <br\/> <span class='basic_pink'>V\u1eady d\u1ea5u c\u1ea7n \u0111i\u1ec1n l\u00e0: > <\/span> <br\/> <span class='basic_green'> <i> Nh\u1eadn x\u00e9t: Khi so s\u00e1nh hai ph\u00e2n s\u1ed1 \u00e2m, c\u00f9ng m\u1eabu; ph\u00e2n s\u1ed1 n\u00e0o t\u1eed s\u1ed1 c\u00f3 gi\u00e1 tr\u1ecb tuy\u1ec7t \u0111\u1ed1i l\u1edbn h\u01a1n th\u00ec ph\u00e2n s\u1ed1 \u0111\u00f3 nh\u1ecf h\u01a1n <\/i> <\/span> "}]}],"id_ques":1509},{"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":"H\u00e3y ch\u1ecdn ph\u00e2n s\u1ed1 nh\u1ecf h\u01a1n 1 trong c\u00e1c ph\u00e2n s\u1ed1 sau:","select":["A. $\\dfrac{9}{7}$","B. $\\dfrac{-16}{-13}$ ","C. $\\dfrac{-2001}{2000}$ ","D. $\\dfrac{-5}{-2}$ "],"hint":"Ph\u00e2n s\u1ed1 nh\u1ecf h\u01a1n 1 l\u00e0 ph\u00e2n s\u1ed1 c\u00f3 t\u1eed s\u1ed1 nh\u1ecf h\u01a1n m\u1eabu s\u1ed1","explain":"<span class='basic_left'><span class='basic_green'>H\u01b0\u1edbng d\u1eabn:<\/span><br\/> <b> B\u01b0\u1edbc 1: <\/b> \u0110\u01b0a c\u00e1c ph\u00e2n s\u1ed1 c\u00f3 m\u1eabu \u00e2m v\u1ec1 m\u1eabu d\u01b0\u01a1ng <br\/> <b> B\u01b0\u1edbc 2: <\/b> So s\u00e1nh m\u1ed7i ph\u00e2n s\u1ed1 tr\u00ean v\u1edbi 1 v\u00e0 ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang <br\/> Ph\u00e2n s\u1ed1 nh\u1ecf h\u01a1n 1 l\u00e0 ph\u00e2n s\u1ed1 c\u00f3 t\u1eed s\u1ed1 nh\u1ecf h\u01a1n m\u1eabu s\u1ed1<\/span> <br\/><br\/> <span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span> <br\/> <br\/> V\u00ec 9 > 7 n\u00ean $\\dfrac{9}{7} > 1$ <b> (lo\u1ea1i) <\/b> <br\/> $\\dfrac{-16}{-13} = \\dfrac{-16 . (-1)}{-13 . (-1)} = \\dfrac{16}{13}$ <br\/> V\u00ec 16 > 13 n\u00ean $\\dfrac{16}{13} > 1$ hay $\\dfrac{-16}{-13} > 1 $ <b> (lo\u1ea1i) <\/b> <br\/> V\u00ec -2001 < 2000 n\u00ean $\\dfrac{-2001}{2000} < 1$ <b> (th\u1ecfa m\u00e3n) <\/b> <br\/> V\u00ec $\\dfrac{-5}{-2} = \\dfrac{-5 . (-1)}{-2 . (-1)} = \\dfrac{5}{2}$ <br\/> V\u00ec 5 > 2 n\u00ean $\\dfrac{5}{2} > 1$ hay $\\dfrac{-5}{-2} > 1$ <b> (lo\u1ea1i) <\/b> <br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0: C. $\\dfrac{-2001}{2000}$ <\/span>","column":2}]}],"id_ques":1510},{"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 ph\u00e2n s\u1ed1 nh\u1ecf h\u01a1n -1 trong c\u00e1c ph\u00e2n s\u1ed1 sau:","select":["A. $\\dfrac{-13}{15}$","B. $\\dfrac{-9}{7}$ ","C. $\\dfrac{15}{13}$ ","D. $\\dfrac{-1999}{2000}$ "],"hint":"","explain":"<span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span> <br\/> X\u00e9t ph\u00e2n s\u1ed1: $\\dfrac{}{15}$ c\u00f3 |-13| = 13; |15| = 15 <br\/> M\u00e0 13 < 15 n\u00ean $0 < \\dfrac{13}{15} < 1$ $\\Rightarrow$ $\\dfrac{-13}{15} > -1$ <b> (lo\u1ea1i) <\/b> <br\/> $\\dfrac{-9}{7}$ c\u00f3 |-9| = 9; |7| = 7 m\u00e0 9 > 7 n\u00ean $\\dfrac{9}{7} > 1$ $\\Rightarrow$ $\\dfrac{-9}{7} < -1$ <b> (th\u1ecfa m\u00e3n) <\/b> <br\/> $\\dfrac{15}{13}$ c\u00f3 15 > 13 n\u00ean $\\dfrac{15}{13} > 1$ <b> (lo\u1ea1i) <\/b> <br\/> $\\dfrac{-1999}{2000}$ c\u00f3 |-1999| = 1999; |2000| = 2000 <br\/> V\u00ec 1999 < 2000 $\\Rightarrow$ $0 < \\dfrac{1999}{2000} < 1$ <br\/> $\\Rightarrow$ $\\dfrac{-1999}{2000} > -1$ <b> (lo\u1ea1i) <\/b><br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0: B. $\\dfrac{-9}{7}$ <\/span> <br\/> <span class='basic_green'><i> Nh\u1eadn x\u00e9t: Ph\u00e2n s\u1ed1 nh\u1ecf h\u01a1n -1 l\u00e0 ph\u00e2n s\u1ed1 c\u00f3 gi\u00e1 tr\u1ecb tuy\u1ec7t \u0111\u1ed1i l\u1edbn h\u01a1n 1 <\/i> <\/span>","column":2}]}],"id_ques":1511},{"time":24,"part":[{"title":"\u0110i\u1ec1n \u0111\u00e1p \u00e1n \u0111\u00fang v\u00e0o \u00f4 tr\u1ed1ng","title_trans":"","temp":"fill_the_blank","correct":[[["-7"],["-6"],["-5"]]],"list":[{"point":5,"width":50,"type_input":"","ques":"H\u00e3y \u0111i\u1ec1n s\u1ed1 th\u00edch h\u1ee3p v\u00e0o \u00f4 tr\u1ed1ng <br\/> $\\dfrac{-8}{9}$ < <div class=\"frac123\"><div class=\"ts\">_input_<\/div><div class=\"ms\">9<\/div><\/div> < <div class=\"frac123\"><div class=\"ts\">_input_<\/div><div class=\"ms\">9<\/div><\/div> < <div class=\"frac123\"><div class=\"ts\">_input_<\/div><div class=\"ms\">9<\/div><\/div> < $\\dfrac{-4}{9}$ ","hint":"Khi so s\u00e1nh hai ph\u00e2n s\u1ed1 c\u00f9ng m\u1eabu, ph\u00e2n s\u1ed1 n\u00e0o c\u00f3 t\u1eed s\u1ed1 nh\u1ecf h\u01a1n th\u00ec ph\u00e2n s\u1ed1 \u0111\u00f3 nh\u1ecf h\u01a1n v\u00e0 ng\u01b0\u1ee3c l\u1ea1i","explain":" <span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span><br\/> V\u00ec c\u00e1c ph\u00e2n s\u1ed1 tr\u00ean l\u00e0 c\u00e1c ph\u00e2n s\u1ed1 c\u00f9ng m\u1eabu <br\/> M\u1eb7t kh\u00e1c ta c\u00f3: -8 < -7 < -6 < -5 < -4 <br\/> N\u00ean $\\dfrac{-8}{9} < \\dfrac{-7}{9} < \\dfrac{-6}{9} < \\dfrac{-5}{9} < \\dfrac{-4}{9}$ <br\/> <span class='basic_pink'>V\u1eady c\u00e1c s\u1ed1 c\u1ea7n \u0111i\u1ec1n l\u1ea7n l\u01b0\u1ee3t l\u00e0: -7, -6, -5 <\/span> "}]}],"id_ques":1512},{"time":24,"part":[{"title":"\u0110i\u1ec1n \u0111\u00e1p \u00e1n \u0111\u00fang v\u00e0o \u00f4 tr\u1ed1ng","title_trans":"","temp":"fill_the_blank","correct":[[["2"],["3"]]],"list":[{"point":5,"width":50,"type_input":"","ques":"H\u00e3y \u0111i\u1ec1n s\u1ed1 th\u00edch h\u1ee3p v\u00e0o \u00f4 tr\u1ed1ng <br\/> $\\dfrac{1}{5}$ < <div class=\"frac123\"><div class=\"ts\">_input_<\/div><div class=\"ms\">5<\/div><\/div> < <div class=\"frac123\"><div class=\"ts\">_input_<\/div><div class=\"ms\">5<\/div><\/div> < $\\dfrac{4}{5}$ ","hint":"","explain":" <span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span><br\/> V\u00ec c\u00e1c ph\u00e2n s\u1ed1 tr\u00ean \u0111\u1ec1u c\u00f3 c\u00f9ng m\u1eabu l\u00e0 5 <br\/> M\u00e0 1 < 2 < 3 < 4 <br\/> N\u00ean: $\\dfrac{1}{5} < \\dfrac{2}{5} < \\dfrac{3}{5} < \\dfrac{4}{5}$ <br\/> <span class='basic_pink'> V\u1eady c\u00e1c s\u1ed1 c\u1ea7n \u0111i\u1ec1n l\u1ea7n l\u01b0\u1ee3t l\u00e0: 2; 3 <\/span> "}]}],"id_ques":1513},{"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":"C\u00e1c ph\u00e2n s\u1ed1 $\\dfrac{8}{15}; \\dfrac{2}{3}; \\dfrac{4}{9}; \\dfrac{3}{5}$ \u0111\u01b0\u1ee3c s\u1eafp x\u1ebfp theo th\u1ee9 t\u1ef1 t\u0103ng d\u1ea7n l\u00e0:","select":["A. $\\dfrac{8}{15}; \\dfrac{4}{9}; \\dfrac{3}{5}; \\dfrac{2}{3}$","B. $\\dfrac{4}{9}; \\dfrac{3}{5}; \\dfrac{8}{15}; \\dfrac{2}{3}$","C. $\\dfrac{4}{9}; \\dfrac{8}{15}; \\dfrac{3}{5}; \\dfrac{2}{3}$ ","D. $\\dfrac{4}{9}; \\dfrac{2}{3}; \\dfrac{3}{5}; \\dfrac{8}{15}$ "],"hint":"Quy \u0111\u1ed3ng m\u1eabu c\u00e1c ph\u00e2n s\u1ed1 r\u1ed3i so s\u00e1nh","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 c\u00e1c ph\u00e2n s\u1ed1 <br\/> <b> B\u01b0\u1edbc 2: <\/b> So s\u00e1nh c\u00e1c ph\u00e2n s\u1ed1 r\u1ed3i s\u1eafp x\u1ebfp theo th\u1ee9 t\u1ef1 t\u1eeb nh\u1ecf \u0111\u1ebfn l\u1edbn<\/span> <br\/><br\/><span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span> <br\/> M\u1eabu s\u1ed1 chung: BCNN(15, 9, 5, 3) = 45 <br\/> $\\dfrac{8}{15} = \\dfrac{8 . 3}{15 . 3} = \\dfrac{24}{45}$ <br\/> $\\dfrac{4}{9} = \\dfrac{4 . 5}{9 . 5} = \\dfrac{20}{45}$ <br\/> $\\dfrac{3}{5} = \\dfrac{3 . 9}{5 . 9} = \\dfrac{27}{45}$ <br\/> $\\dfrac{2}{3} = \\dfrac{2 . 15}{3 . 15} = \\dfrac{30}{45}$ <br\/> V\u00ec $\\dfrac{20}{45} < \\dfrac{24}{45} < \\dfrac{27}{45} < \\dfrac{30}{45}$ <br\/> N\u00ean: $\\dfrac{4}{9} < \\dfrac{8}{15} < \\dfrac{3}{5} < \\dfrac{2}{3}$ <br\/> N\u00ean c\u00e1c ph\u00e2n s\u1ed1 tr\u00ean \u0111\u01b0\u1ee3c s\u1eafp x\u1ebfp theo th\u1ee9 t\u1ef1 t\u0103ng d\u1ea7n l\u00e0: <span class='basic_pink'> $\\dfrac{4}{9}; \\dfrac{8}{15}; \\dfrac{3}{5}; \\dfrac{2}{3}$ <\/span> ","column":2}]}],"id_ques":1514},{"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":"C\u00e1c ph\u00e2n s\u1ed1 $\\dfrac{-7}{12}; \\dfrac{-5}{8}; \\dfrac{-3}{5}$ \u0111\u01b0\u1ee3c s\u1eafp x\u1ebfp theo th\u1ee9 t\u1ef1 gi\u1ea3m d\u1ea7n l\u00e0:","select":["A. $\\dfrac{-7}{12}; \\dfrac{-3}{5}; \\dfrac{-5}{8}$","B. $\\dfrac{-5}{8}; \\dfrac{-3}{5}; \\dfrac{-7}{12}$","C. $\\dfrac{-3}{5}; \\dfrac{-7}{12}; \\dfrac{-5}{8}$ ","D. $\\dfrac{-3}{5}; \\dfrac{-5}{8}; \\dfrac{-7}{12}$ "],"hint":"Quy \u0111\u1ed3ng m\u1eabu c\u00e1c ph\u00e2n s\u1ed1 r\u1ed3i so s\u00e1nh","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 c\u00e1c ph\u00e2n s\u1ed1 <br\/> <b> B\u01b0\u1edbc 2: <\/b> So s\u00e1nh c\u00e1c ph\u00e2n s\u1ed1 r\u1ed3i s\u1eafp x\u1ebfp theo th\u1ee9 t\u1ef1 t\u1eeb nh\u1ecf \u0111\u1ebfn l\u1edbn<\/span> <br\/><br\/><span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span> <br\/> M\u1eabu s\u1ed1 chung: BCNN(12, 5, 8) = 120 <br\/> $\\dfrac{-7}{12} = \\dfrac{-7 . 10}{12 . 10} = \\dfrac{-70}{120}$ <br\/> $\\dfrac{-5}{8} = \\dfrac{-5 . 15}{8 . 15} = \\dfrac{-75}{120}$ <br\/> $\\dfrac{-3}{5} = \\dfrac{-3 . 24}{5 . 24} = \\dfrac{-72}{120}$ <br\/> V\u00ec $\\dfrac{-70}{120} > \\dfrac{-72}{120} > \\dfrac{-75}{120} $ <br\/> N\u00ean: $\\dfrac{-7}{12} > \\dfrac{-3}{5} > \\dfrac{-5}{8}$ <br\/> N\u00ean c\u00e1c ph\u00e2n s\u1ed1 tr\u00ean \u0111\u01b0\u1ee3c s\u1eafp x\u1ebfp theo th\u1ee9 t\u1ef1 gi\u1ea3m d\u1ea7n l\u00e0: <span class='basic_pink'> $\\dfrac{-7}{12}; \\dfrac{-3}{5}; \\dfrac{-5}{8}$ <\/span> ","column":2}]}],"id_ques":1515},{"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":"Quy \u0111\u1ed3ng m\u1eabu c\u00e1c ph\u00e2n s\u1ed1 $\\dfrac{3}{4}; \\dfrac{-7}{8}$ v\u00e0 $\\dfrac{5}{12}$ v\u1edbi m\u1eabu s\u1ed1 chung l\u00e0 24 ta \u0111\u01b0\u1ee3c c\u00e1c ph\u00e2n s\u1ed1:","select":["A. $\\dfrac{3}{24}; \\dfrac{-7}{24}; \\dfrac{5}{24}$","B. $\\dfrac{18}{24}; \\dfrac{-7}{24}; \\dfrac{10}{24}$","C. $\\dfrac{18}{24}; \\dfrac{-21}{24}; \\dfrac{10}{24}$ ","D. $\\dfrac{3}{24}; \\dfrac{-21}{24}; \\dfrac{10}{24}$ "],"hint":"","explain":"<span class='basic_left'><span class='basic_green'>H\u01b0\u1edbng d\u1eabn:<\/span><br\/> <b> B\u01b0\u1edbc 1: <\/b> T\u00ecm th\u1eeba s\u1ed1 ph\u1ee5 t\u01b0\u01a1ng \u1ee9ng c\u1ee7a m\u1ed7i ph\u00e2n s\u1ed1 b\u1eb1ng c\u00e1ch l\u1ea5y m\u1eabu s\u1ed1 chung chia cho m\u1eabu s\u1ed1 ri\u00eang <br\/> <b> B\u01b0\u1edbc 2: <\/b> Quy \u0111\u1ed3ng m\u1eabu t\u1eebng ph\u00e2n s\u1ed1 b\u1eb1ng c\u00e1ch nh\u00e2n c\u1ea3 t\u1eed v\u00e0 m\u1eabu c\u1ee7a m\u1ed7i ph\u00e2n s\u1ed1 v\u1edbi th\u1eeba s\u1ed1 ph\u1ee5 t\u01b0\u01a1ng \u1ee9ng <\/span> <br\/><br\/><span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span> <br\/> Th\u1eeba s\u1ed1 ph\u1ee5: 24 : 4 = 6; 24 : 8 = 3; 24 : 12 = 2 <br\/> $\\dfrac{3}{4} = \\dfrac{3 . 6}{4 . 6} = \\dfrac{18}{24}$ <br\/> $\\dfrac{-7}{8} = \\dfrac{-7 . 3}{8 . 3} = \\dfrac{-21}{24}$ <br\/> $\\dfrac{5}{12} = \\dfrac{5 . 2}{12 . 2} = \\dfrac{10}{24}$ <br\/> N\u00ean c\u00e1c ph\u00e2n s\u1ed1 $\\dfrac{3}{4}; \\dfrac{-7}{8}$ v\u00e0 $\\dfrac{5}{12}$ \u0111\u01b0\u1ee3c quy \u0111\u1ed3ng v\u1edbi m\u1eabu s\u1ed1 chung l\u00e0 24 l\u00e0: <span class='basic_pink'> $\\dfrac{18}{24}; \\dfrac{-21}{24}; \\dfrac{10}{24}$ <\/span> ","column":2}]}],"id_ques":1516},{"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":"Quy \u0111\u1ed3ng m\u1eabu c\u00e1c ph\u00e2n s\u1ed1 $\\dfrac{3}{7}; \\dfrac{4}{11}$ v\u00e0 $\\dfrac{2}{14}$ v\u1edbi m\u1eabu s\u1ed1 chung l\u00e0 154 ta \u0111\u01b0\u1ee3c c\u00e1c ph\u00e2n s\u1ed1:","select":["A. $\\dfrac{3}{154}; \\dfrac{4}{154}; \\dfrac{2}{154}$","B. $\\dfrac{66}{154}; \\dfrac{14}{154}; \\dfrac{11}{154}$","C. $\\dfrac{66}{154}; \\dfrac{56}{154}; \\dfrac{22}{154}$ ","D. $\\dfrac{22}{154}; \\dfrac{14}{154}; \\dfrac{11}{154}$ "],"hint":"","explain":"<span class='basic_left'><span class='basic_green'>H\u01b0\u1edbng d\u1eabn:<\/span><br\/> <b> B\u01b0\u1edbc 1: <\/b> T\u00ecm th\u1eeba s\u1ed1 ph\u1ee5 t\u01b0\u01a1ng \u1ee9ng c\u1ee7a m\u1ed7i ph\u00e2n s\u1ed1 b\u1eb1ng c\u00e1ch l\u1ea5y m\u1eabu s\u1ed1 chung chia cho m\u1eabu s\u1ed1 ri\u00eang <br\/> <b> B\u01b0\u1edbc 2: <\/b> Quy \u0111\u1ed3ng m\u1eabu t\u1eebng ph\u00e2n s\u1ed1 b\u1eb1ng c\u00e1ch nh\u00e2n c\u1ea3 t\u1eed v\u00e0 m\u1eabu c\u1ee7a m\u1ed7i ph\u00e2n s\u1ed1 v\u1edbi th\u1eeba s\u1ed1 ph\u1ee5 t\u01b0\u01a1ng \u1ee9ng <\/span> <br\/><br\/><span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span> <br\/> Th\u1eeba s\u1ed1 ph\u1ee5: 154 : 7 = 22; 154 : 14 = 11; 154 : 11 = 14 <br\/> $\\dfrac{3}{7} = \\dfrac{3 . 22}{7 . 22} = \\dfrac{66}{154}$ <br\/> $\\dfrac{4}{11} = \\dfrac{4 . 14}{11 . 14} = \\dfrac{56}{154}$ <br\/> $\\dfrac{2}{14} = \\dfrac{2 . 11}{14 . 11} = \\dfrac{22}{154}$ <br\/> N\u00ean c\u00e1c ph\u00e2n s\u1ed1 $\\dfrac{3}{7}; \\dfrac{4}{11}$ v\u00e0 $\\dfrac{2}{14}$ \u0111\u01b0\u1ee3c quy \u0111\u1ed3ng v\u1edbi m\u1eabu s\u1ed1 chung l\u00e0 154 l\u00e0: <span class='basic_pink'> $\\dfrac{66}{154}; \\dfrac{56}{154}; \\dfrac{22}{154}$ <\/span> ","column":2}]}],"id_ques":1517},{"time":24,"part":[{"title":"\u0110i\u1ec1n \u0111\u00e1p \u00e1n \u0111\u00fang v\u00e0o \u00f4 tr\u1ed1ng","title_trans":"","temp":"fill_the_blank","correct":[[["75"],["105"]]],"list":[{"point":5,"width":50,"type_input":"","ques":"Quy \u0111\u1ed3ng m\u1eabu s\u1ed1 3 ph\u00e2n s\u1ed1 $\\dfrac{1}{3}; \\dfrac{5}{7}$ v\u00e0 ph\u00e2n s\u1ed1 $\\dfrac{7}{15}$ ta \u0111\u01b0\u1ee3c 3 ph\u00e2n s\u1ed1 l\u00e0: <br\/> $ \\dfrac{35}{105};$ <div class=\"frac123\"><div class=\"ts\">_input_<\/div><div class=\"ms\">_input_<\/div><\/div>; $\\dfrac{49}{105}$ ","hint":"","explain":" <span class='basic_left'><span class='basic_green'>H\u01b0\u1edbng d\u1eabn:<\/span><br\/> <b> B\u01b0\u1edbc 1: <\/b> T\u00ecm th\u1eeba s\u1ed1 ph\u1ee5 <br\/> <b> B\u01b0\u1edbc 2: <\/b> Quy \u0111\u1ed3ng m\u1eabu c\u00e1c ph\u00e2n s\u1ed1 tr\u00ean v\u00e0 \u0111i\u1ec1n s\u1ed1 th\u00edch h\u1ee3p v\u00e0o \u00f4 tr\u1ed1ng <\/span> <br\/><br\/> <span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span><br\/> V\u00ec m\u1eabu s\u1ed1 chung l\u00e0 105 n\u00ean th\u1eeba s\u1ed1 ph\u1ee5 l\u00e0: 105 : 3 = 35; 105 : 7 = 15; 105 : 15 = 7 <br\/> $\\dfrac{5}{7} = \\dfrac{5 . 15}{7 . 15} = \\dfrac{75}{105}$ <br\/> $\\dfrac{1}{3} = \\dfrac{1 . 35}{3 . 35} = \\dfrac{35}{105}$ <br\/> $\\dfrac{7}{15} = \\dfrac{7 . 7}{15 . 7} = \\dfrac{49}{105}$ <br\/> <span class='basic_pink'> V\u1eady c\u00e1c s\u1ed1 c\u1ea7n \u0111i\u1ec1n l\u00e0: 75; 105 <\/span> "}]}],"id_ques":1518},{"time":24,"part":[{"title":"\u0110i\u1ec1n \u0111\u00e1p \u00e1n \u0111\u00fang v\u00e0o \u00f4 tr\u1ed1ng","title_trans":"","temp":"fill_the_blank","correct":[[["8"],["120"]]],"list":[{"point":5,"width":50,"type_input":"","ques":"Quy \u0111\u1ed3ng m\u1eabu s\u1ed1 3 ph\u00e2n s\u1ed1 $\\dfrac{1}{8}; \\dfrac{1}{5}$ v\u00e0 ph\u00e2n s\u1ed1 $\\dfrac{2}{30}$ ta \u0111\u01b0\u1ee3c 3 ph\u00e2n s\u1ed1 l\u00e0: <br\/> $ \\dfrac{15}{120}; \\dfrac{24}{120};$ <div class=\"frac123\"><div class=\"ts\">_input_<\/div><div class=\"ms\">_input_<\/div><\/div>","hint":"","explain":" <span class='basic_left'><span class='basic_green'>H\u01b0\u1edbng d\u1eabn:<\/span><br\/> <b> B\u01b0\u1edbc 1: <\/b> T\u00ecm th\u1eeba s\u1ed1 ph\u1ee5 <br\/> <b> B\u01b0\u1edbc 2: <\/b> Quy \u0111\u1ed3ng m\u1eabu c\u00e1c ph\u00e2n s\u1ed1 tr\u00ean v\u00e0 \u0111i\u1ec1n s\u1ed1 th\u00edch h\u1ee3p v\u00e0o \u00f4 tr\u1ed1ng <\/span> <br\/><br\/> <span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span><br\/> V\u00ec m\u1eabu s\u1ed1 chung l\u00e0 120 n\u00ean th\u1eeba s\u1ed1 ph\u1ee5 l\u00e0: 120 : 8 = 15; 120 : 5 = 24; 120 : 30 = 4 <br\/> $\\dfrac{1}{8} = \\dfrac{1 . 15}{8 . 15} = \\dfrac{15}{120}$ <br\/> $\\dfrac{1}{5} = \\dfrac{1 . 24}{5 . 24} = \\dfrac{24}{120}$ <br\/> $\\dfrac{2}{30} = \\dfrac{2 . 4}{30 . 4} = \\dfrac{8}{120}$ <br\/> <span class='basic_pink'> V\u1eady c\u00e1c s\u1ed1 c\u1ea7n \u0111i\u1ec1n l\u00e0: 8; 120 <\/span> "}]}],"id_ques":1519},{"time":24,"part":[{"title":"\u0110i\u1ec1n \u0111\u00e1p \u00e1n \u0111\u00fang v\u00e0o \u00f4 tr\u1ed1ng","title_trans":"","temp":"fill_the_blank","correct":[[["126"],["153"]]],"list":[{"point":5,"width":50,"type_input":"","ques":"Quy \u0111\u1ed3ng m\u1eabu s\u1ed1 3 ph\u00e2n s\u1ed1 $\\dfrac{14}{17}; \\dfrac{13}{51}$ v\u00e0 ph\u00e2n s\u1ed1 $\\dfrac{92}{153}$ ta \u0111\u01b0\u1ee3c 3 ph\u00e2n s\u1ed1 l\u00e0: <br\/> <div class=\"frac123\"><div class=\"ts\">_input_<\/div><div class=\"ms\">_input_<\/div><\/div>; $\\dfrac{39}{153}; \\dfrac{92}{153}$ ","hint":"","explain":"<span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span><br\/> V\u00ec m\u1eabu s\u1ed1 chung l\u00e0 153 n\u00ean th\u1eeba s\u1ed1 ph\u1ee5 l\u00e0: 153 : 17 = 9; 153 : 51 = 3 <br\/> $\\dfrac{14}{17} = \\dfrac{14 . 9}{17 . 9} = \\dfrac{126}{153}$ <br\/> $\\dfrac{13}{51} = \\dfrac{13 . 3}{51 . 3} = \\dfrac{39}{153}$ <br\/> <span class='basic_pink'> V\u1eady c\u00e1c s\u1ed1 c\u1ea7n \u0111i\u1ec1n l\u00e0: 126; 153 <\/span> "}]}],"id_ques":1520}],"lesson":{"save":0,"level":1}}