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{"segment":[{"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":"$\\dfrac{2}{7}$ c\u1ee7a 35 l\u00e0: ","select":["A. 5 ","B. 10","C. 70","D. 15 "],"hint":"","explain":"<span class='basic_left'><span class='basic_green'>H\u01b0\u1edbng d\u1eabn:<\/span><br\/> PH\u01af\u01a0NG PH\u00c1P T\u00ccM GI\u00c1 TR\u1eca PH\u00c2N S\u1ed0 C\u1ee6A M\u1ed8T S\u1ed0 CHO TR\u01af\u1edaC <br\/> Mu\u1ed1n t\u00ecm $\\dfrac{m}{n}$ c\u1ee7a s\u1ed1 b cho tr\u01b0\u1edbc, ta t\u00ednh $b . \\dfrac{m}{n}$ ($m, n \\in \\mathbb{N}, n \\neq 0$) <\/span> <br\/><br\/><span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span> <br\/> Ta c\u00f3: <br\/> $\\dfrac{2}{7}$ c\u1ee7a 35 l\u00e0: $\\dfrac{2}{7} . 35 = 10$ <br\/> <span class='basic_pink'> V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0: B. 10 <\/span> ","column":4}]}],"id_ques":1811},{"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":"$\\dfrac{4}{5}$ c\u1ee7a 60cm l\u00e0: ","select":["A. 12cm ","B. 15cm","C. 48cm","D. 36cm "],"hint":"","explain":"<span class='basic_left'><span class='basic_green'>H\u01b0\u1edbng d\u1eabn:<\/span><br\/> PH\u01af\u01a0NG PH\u00c1P T\u00ccM GI\u00c1 TR\u1eca PH\u00c2N S\u1ed0 C\u1ee6A M\u1ed8T S\u1ed0 CHO TR\u01af\u1edaC <br\/> Mu\u1ed1n t\u00ecm $\\dfrac{m}{n}$ c\u1ee7a s\u1ed1 b cho tr\u01b0\u1edbc, ta t\u00ednh $b . \\dfrac{m}{n}$ ($m, n \\in \\mathbb{N}, n \\neq 0$) <\/span> <br\/><br\/><span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span> <br\/> Ta c\u00f3: <br\/> $\\dfrac{4}{5}$ c\u1ee7a 60cm l\u00e0: $\\dfrac{4}{5} . 60cm = 48cm$ <br\/> <span class='basic_pink'> V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0: C. 48cm <\/span> ","column":4}]}],"id_ques":1812},{"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":" H\u00e3y so s\u00e1nh 48% c\u1ee7a 25 v\u00e0 25% c\u1ee7a 48. <br\/> \u0110\u00e1p \u00e1n l\u00e0: ","select":["A. 48% c\u1ee7a 25 = 25% c\u1ee7a 48 ","B. 48% c\u1ee7a 25 > 25% c\u1ee7a 48","C. 48% c\u1ee7a 25 < 25% c\u1ee7a 48"],"hint":"Vi\u1ebft 48% v\u00e0 25% d\u01b0\u1edbi d\u1ea1ng ph\u00e2n s\u1ed1 r\u1ed3i t\u00ecm gi\u00e1 tr\u1ecb ph\u00e2n s\u1ed1","explain":"<span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span> <br\/> Ta c\u00f3: <br\/> $48\\% = \\dfrac{48}{100}$; $25 \\% = \\dfrac{25}{100}$ <br\/> 48% c\u1ee7a 25 l\u00e0: $\\dfrac{48}{100} . 25 = \\dfrac{48 . 25}{100} = 12$ (1) <br\/> 25% c\u1ee7a 48 l\u00e0: $\\dfrac{25}{100} . 48 = \\dfrac{25 . 48}{100} = 12$ (2) <br\/> T\u1eeb (1) v\u00e0 (2) $\\Rightarrow$ 48% c\u1ee7a 25 = 25% c\u1ee7a 48 <br\/> <span class='basic_pink'> V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0: A <\/span> <br\/> <span class='basic_green'> <i> Nh\u1eadn x\u00e9t: Ta c\u00f3 a% c\u1ee7a b = b% c\u1ee7a a v\u00ec $\\dfrac{a}{100} . b = \\dfrac{a . b}{100} = \\dfrac{b}{100} . a $","column":1}]}],"id_ques":1813},{"time":24,"part":[{"title":"\u0110i\u1ec1n \u0111\u00e1p \u00e1n \u0111\u00fang v\u00e0o \u00f4 tr\u1ed1ng","title_trans":"","temp":"fill_the_blank","correct":[[["46"]]],"list":[{"point":5,"width":50,"type_input":"","ques":" T\u00ednh nhanh. <br\/> 92% c\u1ee7a 50 = _input_ ","hint":"","explain":" <span class='basic_left'><span class='basic_green'>H\u01b0\u1edbng d\u1eabn:<\/span><br\/> T\u00ecm 50% c\u1ee7a 96 <\/span> <br\/><br\/> <span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span><br\/> V\u00ec 92% c\u1ee7a 50 = 50% c\u1ee7a 96 <br\/> M\u00e0 50% c\u1ee7a 92 l\u00e0 46 n\u00ean 92% c\u1ee7a 50 b\u1eb1ng 46 <br\/> <span class='basic_pink'> V\u1eady s\u1ed1 c\u1ea7n \u0111i\u1ec1n l\u00e0: 46 <\/span> <br\/> <span class='basic_green'> <i> Nh\u1eadn x\u00e9t: Mu\u1ed1n t\u00ecm 50% c\u1ee7a s\u1ed1 a ta l\u1ea5y a chia 2 <br\/> Mu\u1ed1n t\u00ecm 25% c\u1ee7a s\u1ed1 a ta l\u1ea5y a chia 4 <\/i><\/span> "}]}],"id_ques":1814},{"time":24,"part":[{"title":"\u0110i\u1ec1n \u0111\u00e1p \u00e1n \u0111\u00fang v\u00e0o \u00f4 tr\u1ed1ng","title_trans":"","temp":"fill_the_blank","correct":[[["65"]]],"list":[{"point":5,"width":50,"type_input":"","ques":" M\u1ed9t c\u1eeda h\u00e0ng c\u00f3 150 b\u00fat ch\u00ec m\u00e0u. Bu\u1ed5i s\u00e1ng c\u1ee7a h\u00e0ng b\u00e1n \u0111\u01b0\u1ee3c $\\dfrac{2}{5}$ s\u1ed1 b\u00fat ch\u00ec m\u00e0u, bu\u1ed5i chi\u1ec1u c\u1eeda h\u00e0ng b\u00e1n \u0111\u01b0\u1ee3c $\\dfrac{1}{6}$ s\u1ed1 b\u00fat ch\u00ec m\u00e0u. H\u1ecfi c\u1eeda h\u00e0ng c\u00f2n l\u1ea1i bao nhi\u00eau b\u00fat ch\u00ec m\u00e0u sau khi b\u00e1n bu\u1ed5i s\u00e1ng v\u00e0 bu\u1ed5i chi\u1ec1u? <br\/> \u0110\u00e1p s\u1ed1: _input_ b\u00fat ch\u00ec m\u00e0u ","hint":"\u00c1p d\u1ee5ng ph\u01b0\u01a1ng ph\u00e1p t\u00ecm m\u1ed9t s\u1ed1 bi\u1ebft gi\u00e1 tr\u1ecb ph\u00e2n s\u1ed1 c\u1ee7a n\u00f3","explain":" <span class='basic_left'><span class='basic_green'>H\u01b0\u1edbng d\u1eabn:<\/span><br\/> <b> B\u01b0\u1edbc 1: <\/b> T\u00ednh s\u1ed1 b\u00fat ch\u00ec m\u00e0u c\u1eeda h\u00e0ng \u0111\u00e3 b\u00e1n bu\u1ed5i s\u00e1ng <br\/> <b> B\u01b0\u1edbc 2: <\/b> T\u00ednh s\u1ed1 b\u00fat ch\u00ec c\u1eeda h\u00e0ng \u0111\u00e3 b\u00e1n bu\u1ed5i chi\u1ec1u <br\/> <b> B\u01b0\u1edbc 3: <\/b> T\u00ednh s\u1ed1 b\u00fat ch\u00ec c\u00f2n l\u1ea1i c\u1ee7a c\u1eeda h\u00e0ng <\/span> <br\/><br\/> <span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span><br\/> S\u1ed1 b\u00fat ch\u00ec c\u1eeda h\u00e0ng b\u00e1n \u0111\u01b0\u1ee3c trong bu\u1ed5i s\u00e1ng l\u00e0: <br\/> $\\dfrac{2}{5} . 150 = 60$ (b\u00fat ch\u00ec m\u00e0u) <br\/> S\u1ed1 b\u00fat ch\u00ec c\u1eeda h\u00e0ng b\u00e1n \u0111\u01b0\u1ee3c trong bu\u1ed5i chi\u1ec1u l\u00e0: <br\/> $\\dfrac{1}{6} . 150 = 25$ (b\u00fat ch\u00ec m\u00e0u) <br\/> S\u1ed1 b\u00fat ch\u00ec c\u00f2n l\u1ea1i c\u1ee7a c\u1eeda h\u00e0ng l\u00e0: <br\/> 150 - 60 - 25 = 65 (b\u00fat ch\u00ec m\u00e0u) <br\/> \u0110\u00e1p s\u1ed1: 65 b\u00fat ch\u00ec m\u00e0u <br\/> <span class='basic_pink'> V\u1eady s\u1ed1 c\u1ea7n \u0111i\u1ec1n l\u00e0: 65 <\/span> "}]}],"id_ques":1815},{"time":24,"part":[{"title":"\u0110i\u1ec1n \u0111\u00e1p \u00e1n \u0111\u00fang v\u00e0o \u00f4 tr\u1ed1ng","title_trans":"","temp":"fill_the_blank","correct":[[["64"]]],"list":[{"point":5,"width":50,"type_input":"","ques":" M\u1ed9t khu v\u01b0\u1eddn c\u00f3 di\u1ec7n t\u00edch $360m^2$, trong \u0111\u00f3 $\\dfrac{3}{5}$ di\u1ec7n t\u00edch tr\u1ed3ng hoa H\u1ed3ng, $\\dfrac{2}{9}$ di\u1ec7n t\u00edch tr\u1ed3ng hoa C\u00fac, c\u00f2n l\u1ea1i l\u00e0 tr\u1ed3ng hoa Ly. H\u1ecfi di\u1ec7n t\u00edch tr\u1ed3ng hoa Ly l\u00e0 bao nhi\u00eau m\u00e9t vu\u00f4ng? <br\/> \u0110\u00e1p s\u1ed1: _input_ $m^2$ ","hint":"\u00c1p d\u1ee5ng ph\u01b0\u01a1ng ph\u00e1p t\u00ecm m\u1ed9t s\u1ed1 bi\u1ebft gi\u00e1 tr\u1ecb ph\u00e2n s\u1ed1 c\u1ee7a n\u00f3","explain":" <span class='basic_left'><span class='basic_green'>H\u01b0\u1edbng d\u1eabn:<\/span><br\/> <b> B\u01b0\u1edbc 1: <\/b> T\u00ednh di\u1ec7n t\u00edch tr\u1ed3ng hoa H\u1ed3ng <br\/> <b> B\u01b0\u1edbc 2: <\/b> T\u00ednh di\u1ec7n t\u00edch tr\u1ed3ng hoa C\u00fac <br\/> <b> B\u01b0\u1edbc 3: <\/b> T\u00ednh di\u1ec7n t\u00edch tr\u1ed3ng hoa Ly<\/span> <br\/><br\/> <span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span><br\/> Di\u1ec7n t\u00edch tr\u1ed3ng hoa H\u1ed3ng l\u00e0: <br\/> $\\dfrac{3}{5} . 360 = 216 (m^2)$ <br\/> Di\u1ec7n t\u00edch tr\u1ed3ng hoa C\u00fac l\u00e0: <br\/> $\\dfrac{2}{9} . 360 = 80 (m^2)$ <br\/> Di\u1ec7n t\u00edch tr\u1ed3ng hoa Ly l\u00e0: <br\/> 360 - 216 - 80 = 64 $(m^2)$ <br\/> \u0110\u00e1p s\u1ed1: $64m^2$ <br\/> <span class='basic_pink'> V\u1eady s\u1ed1 c\u1ea7n \u0111i\u1ec1n l\u00e0: 64 <\/span> "}]}],"id_ques":1816},{"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":"$1\\dfrac{8}{19}$ c\u1ee7a $5\\dfrac{5}{18}$ l\u00e0: ","select":["A. $7\\dfrac{1}{2}$","B. $3\\dfrac{1}{2}$","C. $2\\dfrac{1}{7}$","D. $\\dfrac{4}{7}$ "],"hint":"Vi\u1ebft c\u00e1c h\u1ed7n s\u1ed1 d\u01b0\u1edbi d\u1ea1ng ph\u00e2n s\u1ed1 r\u1ed3i t\u00ednh","explain":" <span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span> <br\/> Ta c\u00f3: <br\/> $1\\dfrac{8}{19} = \\dfrac{27}{19}$ <br\/> $5\\dfrac{5}{18} = \\dfrac{95}{18}$ <br\/> $1\\dfrac{8}{19}$ c\u1ee7a $5\\dfrac{5}{18}$ l\u00e0: $\\dfrac{27}{19} . \\dfrac{95}{18} = \\dfrac{15}{2} = 7\\dfrac{1}{2}$ <br\/> <span class='basic_pink'> V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0: A. $7\\dfrac{1}{2}$ <\/span> ","column":4}]}],"id_ques":1817},{"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 m\u1ed9t s\u1ed1 bi\u1ebft $\\dfrac{3}{8}$ c\u1ee7a n\u00f3 b\u1eb1ng 60 <br\/> S\u1ed1 \u0111\u00f3 l\u00e0: ","select":["A. 480","B. 160","C. 180","D. 200 "],"hint":"","explain":"<span class='basic_left'><span class='basic_green'>H\u01b0\u1edbng d\u1eabn:<\/span><br\/>PH\u01af\u01a0NG PH\u00c1P T\u00ccM M\u1ed8T S\u1ed0 BI\u1ebeT GI\u00c1 TR\u1eca PH\u00c2N S\u1ed0 C\u1ee6A N\u00d3 <br\/> N\u1ebfu $\\dfrac{m}{n}$ c\u1ee7a m\u1ed9t s\u1ed1 b\u1eb1ng a th\u00ec s\u1ed1 \u0111\u00f3 l\u00e0 $a : \\dfrac{m}{n}$ <\/span> <br\/><br\/> <span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span> <br\/> $\\dfrac{3}{8}$ c\u1ee7a m\u1ed9t s\u1ed1 b\u1eb1ng 60 n\u00ean s\u1ed1 \u0111\u00f3 l\u00e0: <br\/> $60 : \\dfrac{3}{8} = 160$ <br\/> <span class='basic_pink'> V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0: B. 160 <\/span> ","column":4}]}],"id_ques":1818},{"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 m\u1ed9t s\u1ed1 bi\u1ebft $\\dfrac{5}{12}$ c\u1ee7a n\u00f3 b\u1eb1ng 90 <br\/> S\u1ed1 \u0111\u00f3 l\u00e0: ","select":["A. 18","B. 450","C. 216","D. 60 "],"hint":"","explain":"<span class='basic_left'><span class='basic_green'>H\u01b0\u1edbng d\u1eabn:<\/span><br\/>PH\u01af\u01a0NG PH\u00c1P T\u00ccM M\u1ed8T S\u1ed0 BI\u1ebeT GI\u00c1 TR\u1eca PH\u00c2N S\u1ed0 C\u1ee6A N\u00d3 <br\/> N\u1ebfu $\\dfrac{m}{n}$ c\u1ee7a m\u1ed9t s\u1ed1 b\u1eb1ng a th\u00ec s\u1ed1 \u0111\u00f3 l\u00e0 $a : \\dfrac{m}{n}$ <\/span> <br\/><br\/> <span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span> <br\/> $\\dfrac{5}{12}$ c\u1ee7a m\u1ed9t s\u1ed1 b\u1eb1ng 90 n\u00ean s\u1ed1 \u0111\u00f3 l\u00e0: <br\/> $90 : \\dfrac{5}{12} = 216$ <br\/> <span class='basic_pink'> V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0: C. 216 <\/span> ","column":4}]}],"id_ques":1819},{"time":24,"part":[{"title":"\u0110i\u1ec1n \u0111\u00e1p \u00e1n \u0111\u00fang v\u00e0o \u00f4 tr\u1ed1ng","title_trans":"","temp":"fill_the_blank","correct":[[["900"]]],"list":[{"point":5,"width":50,"type_input":"","ques":" M\u1ed9t kho g\u1ea1o sau khi xu\u1ea5t ra $\\dfrac{7}{15}$ s\u1ed1 g\u1ea1o th\u00ec trong kho c\u00f2n l\u1ea1i 480 t\u1ea5n. T\u00ednh s\u1ed1 g\u1ea1o trong kho l\u00fac \u0111\u1ea7u. <br\/> \u0110\u00e1p s\u1ed1: _input_ t\u1ea5n g\u1ea1o ","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 s\u1ed1 ph\u1ea7n g\u1ea1o c\u00f2n l\u1ea1i trong kho <br\/> <b> B\u01b0\u1edbc 2: <\/b> T\u00ednh s\u1ed1 g\u1ea1o trong kho l\u00fac \u0111\u1ea7u <\/span> <br\/><br\/> <span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span><br\/> G\u1ecdi s\u1ed1 g\u1ea1o trong kho l\u00e0 \u0111\u01a1n v\u1ecb quy \u01b0\u1edbc <br\/> S\u1ed1 ph\u1ea7n g\u1ea1o c\u00f2n l\u1ea1i trong kho l\u00e0: <br\/> $1 - \\dfrac{7}{15} = \\dfrac{8}{15}$ (s\u1ed1 g\u1ea1o) <br\/> S\u1ed1 g\u1ea1o l\u00fac \u0111\u1ea7u c\u1ee7a c\u1eeda h\u00e0ng l\u00e0: <br\/> $480 : \\dfrac{8}{15} = 900$ (t\u1ea5n g\u1ea1o) <br\/> \u0110\u00e1p s\u1ed1: 900 t\u1ea5n g\u1ea1o <br\/> <span class='basic_pink'> V\u1eady s\u1ed1 c\u1ea7n \u0111i\u1ec1n l\u00e0: 900 <\/span> <br\/> <span class='basic_green'> <i> Nh\u1eadn x\u00e9t: C\u0103n c\u1ee9 v\u00e0o n\u1ed9i dung c\u1ee7a b\u00e0i to\u00e1n, t\u00ecm c\u00e1ch chuy\u1ec3n b\u00e0i to\u00e1n v\u1ec1 vi\u1ec7c t\u00ecm m\u1ed9t s\u1ed1 bi\u1ebft gi\u00e1 tr\u1ecb m\u1ed9t ph\u00e2n s\u1ed1 c\u1ee7a n\u00f3, t\u1eeb \u0111\u00f3 th\u1ef1c hi\u1ec7n ph\u00e9p chia \u0111\u1ec3 t\u00ecm \u0111\u00e1p s\u1ed1 <\/i> <\/span> "}]}],"id_ques":1820},{"time":24,"part":[{"title":"\u0110i\u1ec1n \u0111\u00e1p \u00e1n \u0111\u00fang v\u00e0o \u00f4 tr\u1ed1ng","title_trans":"","temp":"fill_the_blank","correct":[[["250"]]],"list":[{"point":5,"width":50,"type_input":"","ques":" Khi \u0111em th\u00f3c \u0111i xay x\u00e1t, ng\u01b0\u1eddi ta s\u1ebd thu \u0111\u01b0\u1ee3c s\u1ed1 l\u01b0\u1ee3ng g\u1ea1o b\u1eb1ng 78% s\u1ed1 l\u01b0\u1ee3ng th\u00f3c \u0111em xay. H\u00e3y t\u00ednh s\u1ed1 th\u00f3c c\u1ea7n \u0111em \u0111i xay \u0111\u1ec3 thu \u0111\u01b0\u1ee3c 195 t\u1ea5n g\u1ea1o. <br\/> \u0110\u00e1p s\u1ed1: _input_ t\u1ea5n th\u00f3c ","hint":"","explain":" <span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span><br\/> N\u1ebfu ta \u0111em 1 t\u1ea5n th\u00f3c \u0111i xay th\u00ec ta s\u1ebd thu \u0111\u01b0\u1ee3c 78% t\u1ea5n g\u1ea1o. T\u1ee9c $\\dfrac{78}{100} $ (t\u1ea5n g\u1ea1o)<br\/> Do \u0111\u00f3 s\u1ed1 th\u00f3c c\u1ea7n \u0111em \u0111i xay x\u00e1t \u0111\u1ec3 c\u00f3 \u0111\u01b0\u1ee3c 195 t\u1ea5n g\u1ea1o l\u00e0: <br\/> $195 : \\dfrac{78}{100} = 250$ (t\u1ea5n th\u00f3c) <br\/> \u0110\u00e1p s\u1ed1: 250 t\u1ea5n th\u00f3c <br\/> <span class='basic_pink'> V\u1eady s\u1ed1 c\u1ea7n \u0111i\u1ec1n l\u00e0: 250 <\/span> "}]}],"id_ques":1821},{"time":24,"part":[{"title":"\u0110i\u1ec1n \u0111\u00e1p \u00e1n \u0111\u00fang v\u00e0o \u00f4 tr\u1ed1ng","title_trans":"","temp":"fill_the_blank","correct":[[["43,75"]]],"list":[{"point":5,"width":50,"type_input":"","ques":" T\u00ecm t\u1ec9 s\u1ed1 ph\u1ea7n tr\u0103m c\u1ee7a 35kg v\u00e0 $\\dfrac{4}{5}$ t\u1ea1 l\u00e0: _input_ % ","hint":"Mu\u1ed1n t\u00ecm t\u1ec9 s\u1ed1 ph\u1ea7n tr\u0103m c\u1ee7a a v\u00e0 b ta t\u00ednh theo c\u00f4ng th\u1ee9c: $\\dfrac{a . 100}{b}\\%$ ","explain":" <span class='basic_left'><span class='basic_green'>H\u01b0\u1edbng d\u1eabn:<\/span><br\/> <b> B\u01b0\u1edbc 1: <\/b> \u0110\u1ed5i $\\dfrac{4}{5}$ t\u1ea1 ra ki-l\u00f4-gam <br\/> <b> B\u01b0\u1edbc 2: <\/b> T\u00ecm t\u1ec9 s\u1ed1 ph\u1ea7n tr\u0103m c\u1ee7a 35kg v\u00e0 ...kg <br\/> L\u1ea5y 35 nh\u00e2n 100 r\u1ed3i chia ... v\u00e0 vi\u1ebft k\u00ed hi\u1ec7u % v\u00e0o k\u1ebft qu\u1ea3 <\/span> <br\/><br\/> <span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span><br\/> <br\/> \u0110\u1ed5i $\\dfrac{4}{5}$ t\u1ea1 = 80kg <br\/> T\u1ec9 s\u1ed1 ph\u1ea7n tr\u0103m c\u1ee7a 35kg v\u00e0 80kg l\u00e0: <br\/> $\\dfrac{35 . 100}{80} = 43,75\\%$ <br\/> <span class='basic_pink'> V\u1eady s\u1ed1 c\u1ea7n \u0111i\u1ec1n l\u00e0: 43,75 <\/span> "}]}],"id_ques":1822},{"time":24,"part":[{"title":"\u0110i\u1ec1n \u0111\u00e1p \u00e1n \u0111\u00fang v\u00e0o \u00f4 tr\u1ed1ng","title_trans":"","temp":"fill_the_blank","correct":[[["87,5"]]],"list":[{"point":5,"width":50,"type_input":"","ques":" T\u00ecm t\u1ec9 s\u1ed1 ph\u1ea7n tr\u0103m c\u1ee7a $\\dfrac{7}{12}$ gi\u1edd v\u00e0 40 ph\u00fat l\u00e0: _input_ % ","hint":"Mu\u1ed1n t\u00ecm t\u1ec9 s\u1ed1 ph\u1ea7n tr\u0103m c\u1ee7a a v\u00e0 b ta t\u00ednh theo c\u00f4ng th\u1ee9c: $\\dfrac{a . 100}{b}\\%$ ","explain":" <span class='basic_left'><span class='basic_green'>H\u01b0\u1edbng d\u1eabn:<\/span><br\/> <b> B\u01b0\u1edbc 1: <\/b> \u0110\u1ed5i $\\dfrac{7}{12}$ gi\u1edd ra ph\u00fat <br\/> <b> B\u01b0\u1edbc 2: <\/b> T\u00ecm t\u1ec9 s\u1ed1 ph\u1ea7n tr\u0103m c\u1ee7a ... ph\u00fat v\u00e0 40 <br\/> L\u1ea5y ... nh\u00e2n 100 r\u1ed3i chia 40 v\u00e0 vi\u1ebft k\u00ed hi\u1ec7u % v\u00e0o k\u1ebft qu\u1ea3 <\/span> <br\/><br\/> <span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span><br\/> <br\/> \u0110\u1ed5i $\\dfrac{7}{12}$ gi\u1edd = 35 ph\u00fat <br\/> T\u1ec9 s\u1ed1 ph\u1ea7n tr\u0103m c\u1ee7a 35 ph\u00fat v\u00e0 40 ph\u00fat l\u00e0: <br\/> $\\dfrac{35 . 100}{40} = 87,5\\%$ <br\/> <span class='basic_pink'> V\u1eady s\u1ed1 c\u1ea7n \u0111i\u1ec1n l\u00e0: 87,5 <\/span> "}]}],"id_ques":1823},{"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":"N\u0103m nay b\u1ed1 36 tu\u1ed5i, con 4 tu\u1ed5i. T\u00ednh t\u1ec9 s\u1ed1 tu\u1ed5i c\u1ee7a con v\u00e0 b\u1ed1. <br\/> \u0110\u00e1p \u00e1n l\u00e0: ","select":["A. $\\dfrac{1}{4}$ ","B. $\\dfrac{1}{9}$","C. 9 ","D. 3 "],"hint":"Mu\u1ed1n t\u00ecm t\u1ec9 s\u1ed1 c\u1ee7a hai s\u1ed1 a v\u00e0 b ta t\u00ednh th\u01b0\u01a1ng a chia b","explain":" <span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span> <br\/> T\u1ec9 s\u1ed1 gi\u1eefa tu\u1ed5i con v\u00e0 tu\u1ed5i b\u1ed1 l\u00e0: <br\/> $4 : 36 = \\dfrac{4}{36} = \\dfrac{1}{9}$ <br\/> <span class='basic_pink'> V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0: $B. \\dfrac{1}{9}$ <\/span> <br\/> <span class='basic_green'> <i> Nh\u1eadn x\u00e9t: N\u1ebfu a v\u00e0 b l\u00e0 c\u00e1c s\u1ed1 \u0111o th\u00ec \u0111\u1ed5i v\u1ec1 c\u00f9ng m\u1ed9t \u0111\u01a1n v\u1ecb \u0111o <br\/> K\u1ebft qu\u1ea3 n\u00ean vi\u1ebft d\u01b0\u1edbi d\u1ea1ng ph\u00e2n s\u1ed1 t\u1ed1i gi\u1ea3n <\/i> <\/span> ","column":2}]}],"id_ques":1824},{"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 s\u1ea3n ph\u1ea9m n\u0103m tr\u01b0\u1edbc b\u00e1n v\u1edbi gi\u00e1 60 000 \u0111\u1ed3ng. N\u0103m sau b\u00e1n v\u1edbi gi\u00e1 75 000 \u0111\u1ed3ng. H\u1ecfi n\u0103m sau gi\u00e1 b\u00e1n \u0111\u00e3 t\u0103ng th\u00eam bao nhi\u00eau ph\u1ea7n tr\u0103m <br\/> \u0110\u00e1p \u00e1n l\u00e0: ","select":["A. 8% ","B. 80%","C. 25% ","D. 15%"],"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 gi\u00e1 ti\u1ec1n n\u0103m sau b\u00e1n h\u01a1n n\u0103m tr\u01b0\u1edbc <br\/> <b> B\u01b0\u1edbc 2: <\/b> T\u00ednh t\u1ec9 s\u1ed1 gi\u00e1 b\u00e1n \u0111\u00e3 t\u0103ng th\u00eam <\/span> <br\/><br\/> <span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span> <br\/> Gi\u00e1 b\u00e1n s\u1ea3n ph\u1ea9m \u0111\u00f3 n\u0103m sau t\u0103ng h\u01a1n n\u0103m tr\u01b0\u1edbc l\u00e0: <br\/> 75 000 - 60 000 = 15 000 (\u0111\u1ed3ng) <br\/> T\u1ec9 s\u1ed1 gi\u00e1 t\u0103ng th\u00eam l\u00e0: <br\/> $\\dfrac{15 000 . 100}{60 000} = 25\\%$ <br\/> <span class='basic_pink'> V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0: C. 25% <\/span> ","column":4}]}],"id_ques":1825},{"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 x bi\u1ebft: <br\/> $2\\dfrac{2}{3} . x + 8 \\dfrac{2}{3} = 3\\dfrac{1}{3}$ <br\/> \u0110\u00e1p \u00e1n l\u00e0: ","select":["A. $x = \\dfrac{3}{8}$ ","B. $x = \\dfrac{-2}{3}$","C. $x = -2$ ","D. $x = -5$"],"hint":"","explain":" <span class='basic_left'><span class='basic_green'>H\u01b0\u1edbng d\u1eabn:<\/span><br\/> <b> B\u01b0\u1edbc 1: <\/b> Chuy\u1ec3n $8\\dfrac{2}{3}$ sang v\u1ebf ph\u1ea3i <br\/> <b> B\u01b0\u1edbc 2: <\/b> x l\u00e0 th\u1eeba s\u1ed1 ch\u01b0a bi\u1ebft <br\/> Mu\u1ed1n t\u00ecm th\u1eeba s\u1ed1 ch\u01b0a bi\u1ebft l\u1ea5y t\u00edch chia th\u1eeba s\u1ed1 \u0111\u00e3 bi\u1ebft <\/span> <br\/><br\/> <span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span> <br\/> $\\begin{align*} 2\\dfrac{2}{3} . x + 8 \\dfrac{2}{3} &= 3\\dfrac{1}{3} \\\\ 2\\dfrac{2}{3} . x &= 3\\dfrac{1}{3} - 8\\dfrac{2}{3} \\\\ \\dfrac{8}{3} . x &= \\dfrac{10}{3} - \\dfrac{26}{3} \\\\ \\dfrac{8}{3} . x &= \\dfrac{-16}{3} \\\\ x &= \\dfrac{-16}{3} : \\dfrac{8}{3} \\\\ x &= \\dfrac{-16}{3} . \\dfrac{3}{8} \\\\ x &= -2 \\end{align*}$ <br\/> <span class='basic_pink'> V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0: C. x = -2 <\/span> ","column":2}]}],"id_ques":1826},{"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: <br\/> $3\\dfrac{2}{7} . x - \\dfrac{1}{8} = 2\\dfrac{3}{4}$ <br\/> \u0110\u00e1p \u00e1n l\u00e0: ","select":["A. $x = \\dfrac{2}{7}$ ","B. $x = \\dfrac{7}{8}$","C. $x = \\dfrac{23}{8}$ ","D. $x = \\dfrac{5}{8}$"],"hint":"","explain":" <span class='basic_left'><span class='basic_green'>H\u01b0\u1edbng d\u1eabn:<\/span><br\/> <b> B\u01b0\u1edbc 1: <\/b> Chuy\u1ec3n $-\\dfrac{1}{8}$ sang v\u1ebf ph\u1ea3i <br\/> <b> B\u01b0\u1edbc 2: <\/b> x l\u00e0 th\u1eeba s\u1ed1 ch\u01b0a bi\u1ebft <br\/> Mu\u1ed1n t\u00ecm th\u1eeba s\u1ed1 ch\u01b0a bi\u1ebft l\u1ea5y t\u00edch chia th\u1eeba s\u1ed1 \u0111\u00e3 bi\u1ebft <\/span> <br\/><br\/> <span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span> <br\/> $\\begin{align*} 3\\dfrac{2}{7} . x - \\dfrac{1}{8} &= 2\\dfrac{3}{4} \\\\ 3\\dfrac{2}{7} . x &= 2\\dfrac{3}{4} + \\dfrac{1}{8} \\\\ \\dfrac{23}{7} . x &= \\dfrac{22}{8} + \\dfrac{1}{8} \\\\ \\dfrac{23}{3} . x &= \\dfrac{23}{8} \\\\ x &= \\dfrac{23}{8} : \\dfrac{23}{7} \\\\ x &= \\dfrac{23}{8} . \\dfrac{7}{23} \\\\ x &= \\dfrac{7}{8} \\end{align*}$ <br\/> <span class='basic_pink'> V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0: $B. x = \\dfrac{7}{8}$ <\/span> ","column":2}]}],"id_ques":1827},{"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":"Tr\u00ean b\u1ea3n \u0111\u1ed3 kho\u1ea3ng c\u00e1ch gi\u1eefa hai \u0111i\u1ec3m A v\u00e0 B l\u00e0 15cm. Kho\u1ea3ng c\u00e1ch gi\u1eefa hai \u0111i\u1ec3m \u1ea5y tr\u00ean th\u1ef1c t\u1ebf l\u00e0 60km. T\u00ednh t\u1ec9 l\u1ec7 x\u00edch c\u1ee7a b\u1ea3n \u0111\u1ed3? <br\/> \u0110\u00e1p \u00e1n l\u00e0: ","select":["A. 1 : 4 ","B. 1 : 400","C. 1 : 4000 ","D. 1 : 400 000"],"hint":"\u00c1p d\u1ee5ng c\u00f4ng th\u1ee9c: $T = \\dfrac{a}{b}$ <br\/> a l\u00e0 kho\u1ea3ng c\u00e1ch tr\u00ean b\u1ea3n \u0111\u1ed3 <br\/> b l\u00e0 kho\u1ea3ng c\u00e1ch tr\u00ean th\u1ef1c t\u1ebf <br\/> T l\u00e0 t\u1ec9 l\u1ec7 x\u00edch","explain":" <span class='basic_left'><span class='basic_green'>H\u01b0\u1edbng d\u1eabn:<\/span><br\/> <b> B\u01b0\u1edbc 1: <\/b> \u0110\u1ed5i 60km ra \u0111\u01a1n v\u1ecb x\u0103ng-ti-m\u00e9t = a(cm) <br\/> <b> B\u01b0\u1edbc 2: <\/b> T\u1ec9 l\u1ec7 x\u00edch = 15 : a <\/span> <br\/><br\/> <span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span> <br\/> \u0110\u1ed5i 60km = 6 000 000cm <br\/> T\u1ec9 l\u1ec7 x\u00edch c\u1ee7a b\u1ea3n \u0111\u1ed3 l\u00e0: <br\/> $T = \\dfrac{15}{6 000 000} = \\dfrac{1}{400 000}$ hay 1 : 400000 <br\/> <span class='basic_pink'> V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0: D. 1 : 400000 <\/span> ","column":2}]}],"id_ques":1828},{"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\u1ec9 l\u1ec7 x\u00edch c\u1ee7a m\u1ed9t b\u1ea3n v\u1ebd l\u00e0 1 : 2000. M\u1ed9t c\u00e2y c\u1ea7u d\u00e0i 500m th\u00ec tr\u00ean b\u1ea3n v\u1ebd c\u00e2y c\u1ea7u d\u00e0i bao nhi\u00eau? <br\/> \u0110\u00e1p \u00e1n l\u00e0: ","select":["A. 25cm ","B. 40cm","C. 0,25cm ","D. 20cm"],"hint":"\u00c1p d\u1ee5ng c\u00f4ng th\u1ee9c: $a = b . T$ <br\/> a l\u00e0 kho\u1ea3ng c\u00e1ch tr\u00ean b\u1ea3n \u0111\u1ed3 <br\/> b l\u00e0 kho\u1ea3ng c\u00e1ch tr\u00ean th\u1ef1c t\u1ebf <br\/> T l\u00e0 t\u1ec9 l\u1ec7 x\u00edch","explain":" <span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span> <br\/> \u0110\u1ed9 d\u00e0i c\u1ee7a c\u00e2y c\u1ea7u tr\u00ean b\u1ea3n v\u1ebd l\u00e0: <br\/> $500 . \\dfrac{1}{2000} = 0,25$ (m) <br\/> \u0110\u1ed5i 0,25m = 25cm <br\/> <span class='basic_pink'> V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0: A. 25cm <\/span> ","column":2}]}],"id_ques":1829},{"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\u1ec9 l\u1ec7 x\u00edch c\u1ee7a m\u1ed9t b\u1ea3n v\u1ebd l\u00e0 1 : 5000. Tr\u00ean b\u1ea3n v\u1ebd n\u00e0y, m\u1ed9t \u0111o\u1ea1n \u0111\u01b0\u1eddng \u0111o \u0111\u01b0\u1ee3c 42cm. H\u1ecfi tr\u00ean th\u1ef1c t\u1ebf \u0111o\u1ea1n \u0111\u01b0\u1eddng d\u00e0i bao nhi\u00eau? <br\/> \u0110\u00e1p \u00e1n l\u00e0: ","select":["A. 2,1km ","B. 21cm","C. 2100cm ","D. 2,1cm"],"hint":"\u00c1p d\u1ee5ng c\u00f4ng th\u1ee9c: $b = a : T$ <br\/> a l\u00e0 kho\u1ea3ng c\u00e1ch tr\u00ean b\u1ea3n \u0111\u1ed3 <br\/> b l\u00e0 kho\u1ea3ng c\u00e1ch tr\u00ean th\u1ef1c t\u1ebf <br\/> T l\u00e0 t\u1ec9 l\u1ec7 x\u00edch","explain":" <span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span> <br\/> \u0110\u1ed9 d\u00e0i c\u1ee7a \u0111o\u1ea1n \u0111\u01b0\u1eddng tr\u00ean b\u1ea3n v\u1ebd l\u00e0: <br\/> $42 : \\dfrac{1}{5000} = 210 000$ (cm) <br\/> \u0110\u1ed5i 210 000cm = 2,1km <br\/> <span class='basic_pink'> V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0: A. 2,1km <\/span> ","column":2}]}],"id_ques":1830}],"lesson":{"save":0,"level":1}}

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Câu hỏi này theo dạng chọn đáp án đúng, sau khi đọc xong câu hỏi, bạn bấm vào một trong số các đáp án mà chương trình đưa ra bên dưới, sau đó bấm vào nút gửi để kiểm tra đáp án và sẵn sàng chuyển sang câu hỏi kế tiếp

Trả lời đúng trong khoảng thời gian quy định bạn sẽ được + số điểm như sau:
Trong khoảng 1 phút đầu tiên + 5 điểm
Trong khoảng 1 phút -> 2 phút + 4 điểm
Trong khoảng 2 phút -> 3 phút + 3 điểm
Trong khoảng 3 phút -> 4 phút + 2 điểm
Trong khoảng 4 phút -> 5 phút + 1 điểm

Quá 5 phút: không được cộng điểm

Tổng thời gian làm mỗi câu (không giới hạn)

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Bấm vào đây nếu phát hiện có lỗi hoặc muốn gửi góp ý