{"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":" T\u00ecm $x$ bi\u1ebft: $5\\sqrt{x} - 17 = 108 ?$ ","select":["A. $x = 50 $","B. $x = 625 $","C. $x = 25$","D. $x = 5$"],"hint":"Chuy\u1ec3n v\u1ebf \u0111\u1ed5i d\u1ea5u. ","explain":" <span class='basic_left'><span class='basic_green'>H\u01b0\u1edbng d\u1eabn:<\/span> <br\/> - Chuy\u1ec3n v\u1ebf <br\/> - \u00c1p d\u1ee5ng: N\u1ebfu $\\sqrt{x} = a (a \\geq 0)$ th\u00ec $x = a^{2}$ <\/span> <br\/> <br\/> <span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span><br\/> $5\\sqrt{x} - 17 = 108\\\\ \\Leftrightarrow 5\\sqrt{x} = 17 + 108 = 125 \\\\ \\Leftrightarrow \\sqrt{x} = 125 : 5 = 25 > 0 \\\\ \\Leftrightarrow x = 25^{2} = 625 $ <br\/> <br\/> <span class='basic_pink'> \u0110\u00e1p \u00e1n \u0111\u00fang l\u00e0 B. <\/span><\/span> ","column":2}]}],"id_ques":421},{"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: $\\sqrt{x} + 1 = 7?$ ","select":["A. $x = 3$ ","B. $x = \\pm 3$","C. $x = 36$","D. $x = \\pm 36 $"],"hint":" Chuy\u1ec3n v\u1ebf \u0111\u1ed5i d\u1ea5u. ","explain":" <span class='basic_left'><span class='basic_green'>H\u01b0\u1edbng d\u1eabn:<\/span> <br\/> - Chuy\u1ec3n v\u1ebf <br\/> - \u00c1p d\u1ee5ng: N\u1ebfu $\\sqrt{x} = a (a \\geq 0)$ th\u00ec $x = a^{2}$ <\/span> <br\/> <br\/> <span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span><br\/> $\\sqrt{x} + 1 = 7 \\\\ \\Leftrightarrow \\sqrt{x} = 7 - 1 = 6 > 0 \\\\ \\Leftrightarrow x = 6^{2} = 36 $ <br\/> <br\/> <span class='basic_pink'> \u0110\u00e1p \u00e1n \u0111\u00fang l\u00e0 C. <\/span><\/span> ","column":2}]}],"id_ques":422},{"time":24,"part":[{"title":"\u0110i\u1ec1n s\u1ed1 th\u00edch h\u1ee3p v\u00e0o \u00f4 tr\u1ed1ng","title_trans":"","temp":"fill_the_blank","correct":[[["-6"]]],"list":[{"point":5,"width":50,"type_input":"","ques":" Gi\u00e1 tr\u1ecb c\u1ee7a bi\u1ec3u th\u1ee9c $ A = \\sqrt{121} - \\sqrt{400} + \\sqrt{(-3)^{2}} $= _input_ ","hint":" T\u00ednh c\u0103n b\u1eadc hai c\u1ee7a c\u00e1c s\u1ed1 r\u1ed3i th\u1ef1c hi\u1ec7n ph\u00e9p t\u00ednh ","explain":" Ta c\u00f3: A = $ \\sqrt{121} - \\sqrt{400} + \\sqrt{(-3)^{2}} \\\\ = \\sqrt{11^{2}} - \\sqrt{20^{2}} + \\sqrt{(-3)^{2}} \\\\ = 11 - 20 + 3 \\\\ = -6 $<br\/> <br\/> <span class='basic_pink'> V\u1eady s\u1ed1 c\u1ea7n \u0111i\u1ec1n l\u00e0 -6. <\/span><\/span>"}]}],"id_ques":423},{"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"]]],"list":[{"point":5,"width":50,"type_input":"","ques":" $\\sqrt{\\dfrac{49}{100}}$ + _input_ = $\\dfrac{-3}{10}$ ","hint":" Coi s\u1ed1 c\u1ea7n \u0111i\u1ec1n l\u00e0 x v\u00e0 gi\u1ea3i nh\u01b0 m\u1ed9t b\u00e0i to\u00e1n t\u00ecm x ","explain":" G\u1ecdi s\u1ed1 c\u1ea7n t\u00ecm l\u00e0 x <br\/> Ta c\u00f3: $ \\sqrt{\\dfrac{49}{100}} + x = \\dfrac{-3}{10} \\\\ \\Rightarrow x = \\dfrac{-3}{10} - \\sqrt{\\dfrac{49}{100}} \\\\ \\Rightarrow x= \\dfrac{-3}{10} - \\dfrac{7}{10} = -1 $ <br\/> <br\/> <span class='basic_pink'> V\u1eady s\u1ed1 c\u1ea7n \u0111i\u1ec1n l\u00e0 -1. <\/span><\/span>"}]}],"id_ques":424},{"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\u1ebfu $\\sqrt{x} = 3$ th\u00ec $x^{3}$ b\u1eb1ng: ","select":["A. 27 ","B. 729","C. 81","D. 9"],"hint":"T\u00ecm $x$ r\u1ed3i suy ra $x^{3}$ ","explain":" <br\/> <span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span><br\/> Ta c\u00f3 $\\sqrt{x} = 3 \\Rightarrow x = 3^{2} = 9 \\\\ \\Rightarrow x^{3} = 9^{3} = 729 $ <br\/> <br\/> <span class='basic_pink'> \u0110\u00e1p \u00e1n \u0111\u00fang l\u00e0 B. <\/span><\/span> ","column":4}]}],"id_ques":425},{"time":24,"part":[{"title":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","title_trans":"","temp":"multiple_choice","correct":[[1]],"list":[{"point":5,"ques":" <center><img src='https://www.luyenthi123.com/file/luyenthi123/lop7/toan/daiso/bai9/lv2/img\/2.jpg'\/><\/center> So s\u00e1nh $\\sqrt{40+2}$ v\u1edbi $\\sqrt{40} + \\sqrt{2},$ ta \u0111\u01b0\u1ee3c: ","select":["A. $\\sqrt{40+2}$ < $\\sqrt{40} + \\sqrt{2}$ ","B. $\\sqrt{40+2}$ = $\\sqrt{40} + \\sqrt{2}$","C. $\\sqrt{40+2}$ > $\\sqrt{40} + \\sqrt{2}$"],"hint":" So s\u00e1nh trung gian v\u1edbi s\u1ed1 7. ","explain":" <span class='basic_left'><span class='basic_green'>H\u01b0\u1edbng d\u1eabn:<\/span> <br\/> So s\u00e1nh trung gian v\u1edbi $\\sqrt{49} = 7 $ <\/span> <br\/> <br\/> <span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span><br\/> Ta c\u00f3: $\\sqrt{40+2} = \\sqrt{42} < \\sqrt{49} = 7 $(1) <br\/> $\\sqrt{40} + \\sqrt{2} > \\sqrt{36} + \\sqrt{1} = 6 + 1 = 7 $ (2) <br\/> T\u1eeb (1) v\u00e0 (2) suy ra $\\sqrt{40+2} < 7 < \\sqrt{40} + \\sqrt{2}$ <br\/> <br\/> <span class='basic_pink'> \u0110\u00e1p \u00e1n \u0111\u00fang l\u00e0 A. <\/span><\/span> ","column":3}]}],"id_ques":426},{"time":9,"part":[{"title":"\u0110i\u1ec1n s\u1ed1 th\u00edch h\u1ee3p v\u00e0o ch\u1ed7 tr\u1ed1ng","title_trans":"","temp":"fill_the_blank","correct":[[["4"],["16"],["5"]]],"list":[{"point":5,"width":50,"type_input":"","ques":" <table><tr><th>x<\/th><th>16<\/th><th>$16^{2}$<\/th><th>25<\/th><\/tr><tr><th> $\\sqrt{x}$ <\/th> <td>_input_<\/td><td>_input_<\/td><td>_input_<\/td><\/tr><\/table> ","hint":"T\u00ecm c\u0103n b\u1eadc hai c\u1ee7a c\u00e1c s\u1ed1 r\u1ed3i \u0111i\u1ec1n v\u00e0o \u00f4 t\u01b0\u01a1ng \u1ee9ng","explain":" <span class='basic_left'><span class='basic_green'>H\u01b0\u1edbng d\u1eabn:<\/span> <br\/> N\u1ebfu $\\sqrt{x} = a (a \\geq 0)$ th\u00ec $x = a^{2}$ <\/span> <br\/> <br\/> <span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span><br\/> Ta c\u00f3: $\\sqrt{16} = 4$ (v\u00ec 4 > 0 v\u00e0 $4^{2} = 16$)<\/br\/> $\\sqrt{16^{2}} = 16$ (v\u00ec 16 > 0 v\u00e0 $16^{2} = 16^{2}$) <br\/> $\\sqrt{25} = 5$ (v\u00ec 5 > 0 v\u00e0 $5^{2} = 25$) <br\/> <br\/> <span class='basic_pink'> <\/span><\/span> "}]}],"id_ques":427},{"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":" <center><img src='https://www.luyenthi123.com/file/luyenthi123/lop7/toan/daiso/bai9/lv2/img\/4.jpg' \/><\/center> Trong c\u00e1c s\u1ed1 sau \u0111\u00e2y s\u1ed1 n\u00e0o kh\u00f4ng c\u00f3 c\u0103n b\u1eadc hai? ","select":["A. 0 ","B. $\\pi - 4$ ","C. $(2 - 11)^{2}$","D. $(-11)^{2}$ "],"hint":" $\\pi$ l\u00e0 m\u1ed9t s\u1ed1 v\u00f4 t\u1ec9 v\u00e0 $\\pi \\approx 3,14$ ","explain":" Ta c\u00f3: 0 c\u00f3 m\u1ed9t c\u0103n b\u1eadc hai l\u00e0 0 <br\/> $\\pi - 4 \\approx 3,14 - 4 \\approx - 0,86 < 0 $ <br\/> Suy ra s\u1ed1 $\\pi - 4$ kh\u00f4ng c\u00f3 c\u0103n b\u1eadc hai. <br\/> $(2 - 11)^{2} = (-9)^2 $ $ =(-9).(-9) = 81>0$ <br\/> Suy ra $(2 - 11)^{2}$ c\u00f3 c\u0103n b\u1eadc hai <br\/> $(-11)^{2} = (-11).(-11) = 121 > 0$ <br\/> Suy ra $(-11)^{2}$ c\u00f3 c\u0103n b\u1eadc hai <br\/> <span class='basic_pink'> \u0110\u00e1p \u00e1n \u0111\u00fang l\u00e0 B. <\/span><\/span> ","column":4}]}],"id_ques":428},{"time":24,"part":[{"time":24,"title":"N\u1ed1i t\u1eeb ho\u1eb7c c\u1ee5m t\u1eeb \u1edf c\u1ed9t b\u00ean tr\u00e1i v\u1edbi c\u1ed9t b\u00ean ph\u1ea3i \u0111\u1ec3 \u0111\u01b0\u1ee3c c\u00e2u ho\u00e0n ch\u1ec9nh","title_trans":"","audio":"","temp":"matching","correct":[["4","1","3","2"]],"list":[{"point":5,"image":"","left":["C\u0103n b\u1eadc hai c\u1ee7a m\u1ed9t s\u1ed1 a kh\u00f4ng \u00e2m l\u00e0 m\u1ed9t s\u1ed1 x sao cho","M\u1ed7i s\u1ed1 d\u01b0\u01a1ng","S\u1ed1 0","S\u1ed1 \u00e2m"],"right":["c\u00f3 hai gi\u00e1 tr\u1ecb c\u0103n b\u1eadc hai l\u00e0 hai s\u1ed1 \u0111\u1ed1i nhau.","kh\u00f4ng c\u00f3 c\u0103n b\u1eadc hai.","c\u00f3 \u0111\u00fang m\u1ed9t c\u0103n b\u1eadc hai.","$x^{2} = a$"],"top":100,"hint":"Xem l\u1ea1i kh\u00e1i ni\u1ec7m v\u1ec1 c\u0103n b\u1eadc hai.","explain":"C\u0103n b\u1eadc hai c\u1ee7a m\u1ed9t s\u1ed1 a kh\u00f4ng \u00e2m l\u00e0 m\u1ed9t s\u1ed1 x sao cho $x^{2} = a$ <br\/> M\u1ed7i s\u1ed1 d\u01b0\u01a1ng c\u00f3 hai gi\u00e1 tr\u1ecb c\u0103n b\u1eadc hai l\u00e0 hai s\u1ed1 \u0111\u1ed1i nhau. <br\/> S\u1ed1 0 c\u00f3 \u0111\u00fang m\u1ed9t c\u0103n b\u1eadc hai. <br\/> S\u1ed1 \u00e2m kh\u00f4ng c\u00f3 c\u0103n b\u1eadc hai. "}]}],"id_ques":429},{"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":" <center><img src='https://www.luyenthi123.com/file/luyenthi123/lop7/toan/daiso/bai9/lv2/img\/4.jpg' \/><\/center> Ph\u00e1t bi\u1ec3u n\u00e0o sau \u0111\u00e2y kh\u00f4ng \u0111\u00fang?","select":["A. C\u0103n b\u1eadc hai c\u1ee7a m\u1ed9t s\u1ed1 a kh\u00f4ng \u00e2m l\u00e0 s\u1ed1 x sao cho $x^{2} = a.$ ","B. S\u1ed1 a c\u00f3 hai c\u0103n b\u1eadc hai l\u00e0 $\\sqrt{a}$ v\u00e0 $- \\sqrt{a}$. ","C. S\u1ed1 0 ch\u1ec9 c\u00f3 m\u1ed9t c\u0103n b\u1eadc hai l\u00e0 s\u1ed1 0: $\\sqrt{0} = 0 . $"],"hint":"Xem kh\u00e1i ni\u1ec7m c\u0103n b\u1eadc hai. ","explain":" <span class='basic_left'><span class='basic_green'>H\u01b0\u1edbng d\u1eabn:<\/span> <br\/> <b> Kh\u00e1i ni\u1ec7m c\u0103n b\u1eadc hai <\/b> <br\/> * C\u0103n b\u1eadc hai c\u1ee7a m\u1ed9t s\u1ed1 a kh\u00f4ng \u00e2m l\u00e0 s\u1ed1 x sao cho $x^{2} = a.$ <br\/> * S\u1ed1 d\u01b0\u01a1ng a c\u00f3 \u0111\u00fang hai c\u0103n b\u1eadc hai, m\u1ed9t s\u1ed1 d\u01b0\u01a1ng k\u00ed hi\u1ec7u l\u00e0 $\\sqrt{a}$ v\u00e0 m\u1ed9t s\u1ed1 \u00e2m k\u00ed hi\u1ec7u l\u00e0 $-\\sqrt{a}.$ <br\/> S\u1ed1 0 c\u00f3 \u0111\u00fang m\u1ed9t c\u0103n b\u1eadc hai, $\\sqrt{0} = 0 .$ <\/span> <br\/> <br\/> <span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span><br\/> Theo \u0111\u1ecbnh ngh\u0129a c\u0103n b\u1eadc hai ph\u00e1t bi\u1ec3u kh\u00f4ng \u0111\u00fang l\u00e0 B. V\u00ec: <br\/> S\u1ed1 a c\u00f3 \u0111\u00fang hai c\u0103n b\u1eadc hai l\u00e0 $\\sqrt{a}$ v\u00e0 $-\\sqrt{a}$ n\u1ebfu v\u00e0 ch\u1ec9 n\u1ebfu a d\u01b0\u01a1ng <br\/> <br\/> <span class='basic_pink'> Ch\u1ecdn \u0111\u00e1p \u00e1n B. <\/span><\/span> ","column":1}]}],"id_ques":430},{"time":24,"part":[{"title":"\u0110i\u1ec1n s\u1ed1 th\u00edch h\u1ee3p v\u00e0o \u00f4 tr\u1ed1ng","title_trans":"","temp":"fill_the_blank","correct":[[["9,31"]]],"list":[{"point":5,"width":80,"type_input":"","ques":" Th\u1ef1c hi\u1ec7n ph\u00e9p t\u00ednh r\u1ed3i l\u00e0m tr\u00f2n k\u1ebft qu\u1ea3 \u0111\u1ebfn s\u1ed1 ch\u1eef th\u1eadp ph\u00e2n th\u1ee9 hai? <br\/> M = 5,3010 + 1,49 + 2,364 + 0,154 = _input_","explain":" <span class='basic_left'><span class='basic_green'>H\u01b0\u1edbng d\u1eabn:<\/span><br\/> <b> Quy \u01b0\u1edbc l\u00e0m tr\u00f2n s\u1ed1 <\/b> <br\/> * N\u1ebfu ch\u1eef s\u1ed1 \u0111\u1ea7u ti\u00ean trong c\u00e1c ch\u1eef s\u1ed1 b\u1ecb b\u1ecf \u0111i nh\u1ecf h\u01a1n 5 th\u00ec ta gi\u1eef nguy\u00ean b\u1ed9 ph\u1eadn c\u00f2n l\u1ea1i. <br\/> * N\u1ebfu ch\u1eef s\u1ed1 \u0111\u1ea7u ti\u00ean trong c\u00e1c ch\u1eef s\u1ed1 b\u1ecb b\u1ecf \u0111i l\u1edbn h\u01a1n ho\u1eb7c b\u1eb1ng 5 th\u00ec c\u1ed9ng th\u00eam 1 v\u00e0o ch\u1eef s\u1ed1 cu\u1ed1i c\u00f9ng c\u1ee7a b\u1ed9 ph\u1eadn c\u00f2n l\u1ea1i. <br\/> * Trong tr\u01b0\u1eddng h\u1ee3p s\u1ed1 nguy\u00ean th\u00ec ta thay c\u00e1c ch\u1eef s\u1ed1 b\u1ecf \u0111i b\u1eb1ng c\u00e1c ch\u1eef s\u1ed1 0. <\/span> <br\/><br\/><span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span><br\/> Ta c\u00f3: M = 5,3010 + 1,49 + 2,364 + 0,154 = 9,309 <br\/> L\u00e0m tr\u00f2n s\u1ed1 9,309 \u0111\u1ebfn ch\u1eef s\u1ed1 th\u1eadp ph\u00e2n th\u1ee9 hai ta \u0111\u01b0\u1ee3c: 9,31. <br\/> <br\/> <span class='basic_pink'> V\u1eady s\u1ed1 c\u1ea7n \u0111i\u1ec1n l\u00e0 9,31. <\/span><\/span>"}]}],"id_ques":431},{"time":24,"part":[{"title":"\u0110i\u1ec1n s\u1ed1 th\u00edch h\u1ee3p v\u00e0o \u00f4 tr\u1ed1ng","title_trans":"","temp":"fill_the_blank","correct":[[["4,77"]]],"list":[{"point":5,"width":70,"type_input":"","ques":"Th\u1ef1c hi\u1ec7n ph\u00e9p t\u00ednh r\u1ed3i l\u00e0m tr\u00f2n k\u1ebft qu\u1ea3 \u0111\u1ebfn s\u1ed1 ch\u1eef th\u1eadp ph\u00e2n th\u1ee9 hai? <br\/> M = (2,635 + 8,3) - (6,002 + 0,16) = _input_","explain":" <span class='basic_left'><span class='basic_green'>H\u01b0\u1edbng d\u1eabn:<\/span><br\/> <b> Quy \u01b0\u1edbc l\u00e0m tr\u00f2n s\u1ed1 <\/b> <br\/> * N\u1ebfu ch\u1eef s\u1ed1 \u0111\u1ea7u ti\u00ean trong c\u00e1c ch\u1eef s\u1ed1 b\u1ecb b\u1ecf \u0111i nh\u1ecf h\u01a1n 5 th\u00ec ta gi\u1eef nguy\u00ean b\u1ed9 ph\u1eadn c\u00f2n l\u1ea1i. <br\/> * N\u1ebfu ch\u1eef s\u1ed1 \u0111\u1ea7u ti\u00ean trong c\u00e1c ch\u1eef s\u1ed1 b\u1ecb b\u1ecf \u0111i l\u1edbn h\u01a1n ho\u1eb7c b\u1eb1ng 5 th\u00ec c\u1ed9ng th\u00eam 1 v\u00e0o ch\u1eef s\u1ed1 cu\u1ed1i c\u00f9ng c\u1ee7a b\u1ed9 ph\u1eadn c\u00f2n l\u1ea1i. <br\/> * Trong tr\u01b0\u1eddng h\u1ee3p s\u1ed1 nguy\u00ean th\u00ec ta thay c\u00e1c ch\u1eef s\u1ed1 b\u1ecf \u0111i b\u1eb1ng c\u00e1c ch\u1eef s\u1ed1 0. <\/span> <br\/><br\/><span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span><br\/> Ta c\u00f3: M = (2,635 + 8,3) - (6,002 + 0,16) <br\/> = 10,935 - 6,162 = 4,773 <br\/> L\u00e0m tr\u00f2n s\u1ed1 4,773 \u0111\u1ebfn ch\u1eef s\u1ed1 th\u1eadp ph\u00e2n th\u1ee9 hai ta \u0111\u01b0\u1ee3c: 4,77. <br\/> <br\/> <span class='basic_pink'> V\u1eady s\u1ed1 c\u1ea7n \u0111i\u1ec1n l\u00e0 4,77. <\/span><\/span>"}]}],"id_ques":432},{"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\u1ebft h\u1ecdc k\u00ec I, \u0111i\u1ec3m To\u00e1n c\u1ee7a b\u1ea1n C\u01b0\u1eddng nh\u01b0 sau: \u0110i\u1ec3m h\u1ec7 s\u1ed1 1: 7; 8; 6; 10, \u0111i\u1ec3m h\u1ec7 s\u1ed1 2: 7; 6; 5; 9 v\u00e0 \u0111i\u1ec3m h\u1ec7 s\u1ed1 3: 9. H\u00e3y t\u00ednh \u0111i\u1ec3m trung b\u00ecnh m\u00f4n To\u00e1n h\u1ecdc k\u00ec I c\u1ee7a b\u1ea1n C\u01b0\u1eddng? <br\/> (l\u00e0m tr\u00f2n \u0111\u1ebfn ch\u1eef s\u1ed1 th\u1eadp ph\u00e2n th\u1ee9 nh\u1ea5t) ","select":["A. 7,3 ","B. 7,4","C. 7,5","D. 7,6"],"hint":" Xem l\u1ea1i c\u00f4ng th\u1ee9c t\u00ednh \u0111i\u1ec3m trung b\u00ecnh","explain":" <span class='basic_left'><span class='basic_green'>H\u01b0\u1edbng d\u1eabn:<\/span> <br\/> <b> Quy \u01b0\u1edbc l\u00e0m tr\u00f2n s\u1ed1 <\/b> <br\/> * N\u1ebfu ch\u1eef s\u1ed1 \u0111\u1ea7u ti\u00ean trong c\u00e1c ch\u1eef s\u1ed1 b\u1ecb b\u1ecf \u0111i nh\u1ecf h\u01a1n 5 th\u00ec ta gi\u1eef nguy\u00ean b\u1ed9 ph\u1eadn c\u00f2n l\u1ea1i. <br\/> * N\u1ebfu ch\u1eef s\u1ed1 \u0111\u1ea7u ti\u00ean trong c\u00e1c ch\u1eef s\u1ed1 b\u1ecb b\u1ecf \u0111i l\u1edbn h\u01a1n ho\u1eb7c b\u1eb1ng 5 th\u00ec c\u1ed9ng th\u00eam 1 v\u00e0o ch\u1eef s\u1ed1 cu\u1ed1i c\u00f9ng c\u1ee7a b\u1ed9 ph\u1eadn c\u00f2n l\u1ea1i. <br\/> * Trong tr\u01b0\u1eddng h\u1ee3p s\u1ed1 nguy\u00ean th\u00ec ta thay c\u00e1c ch\u1eef s\u1ed1 b\u1ecf \u0111i b\u1eb1ng c\u00e1c ch\u1eef s\u1ed1 0. <\/span> <br\/> <br\/> <span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span><br\/> \u0110i\u1ec3m trung b\u00ecnh h\u1ecdc k\u00ec I m\u00f4n To\u00e1n c\u1ee7a b\u1ea1n C\u01b0\u1eddng l\u00e0: <br\/> $\\dfrac{1.(7+8+6+10) + 2(7+6+5+9) + 3.9}{1.4+2.4+3.1} \\\\ = \\dfrac{31+54+27}{15} = \\dfrac{112}{15} = 7,46666...$ <br\/> L\u00e0m tr\u00f2n s\u1ed1 7,46666... \u0111\u1ebfn ch\u1eef s\u1ed1 th\u1eadp ph\u00e2n th\u1ee9 nh\u1ea5t ta \u0111\u01b0\u1ee3c: 7,5. <br\/> <br\/> <span class='basic_pink'> \u0110\u00e1p \u00e1n \u0111\u00fang l\u00e0 C. <\/span><\/span> ","column":4}]}],"id_ques":433},{"time":24,"part":[{"title":"\u0110i\u1ec1n s\u1ed1 th\u00edch h\u1ee3p v\u00e0o \u00f4 tr\u1ed1ng","title_trans":"","temp":"fill_the_blank","correct":[[["49,6"]]],"list":[{"point":5,"width":80,"type_input":"","ques":" T\u00ednh chu vi c\u1ee7a m\u1ed9t h\u00ecnh vu\u00f4ng c\u00f3 c\u1ea1nh \u0111o \u0111\u01b0\u1ee3c l\u00e0 12,4 m? <br\/> (V\u1eady s\u1ed1 c\u1ea7n \u0111i\u1ec1n \u0111\u01b0\u1ee3c l\u00e0m tr\u00f2n \u0111\u1ebfn ch\u1eef s\u1ed1 th\u1eadp ph\u00e2n th\u1ee9 nh\u1ea5t) <br\/> <b> \u0110\u00e1p s\u1ed1: <\/b> P =_input_(m)","hint":" Mu\u1ed1n t\u00ednh chu vi h\u00ecnh vu\u00f4ng ta l\u1ea5y s\u1ed1 \u0111o m\u1ed9t c\u1ea1nh nh\u00e2n 4 ","explain":" <span class='basic_left'><span class='basic_green'>H\u01b0\u1edbng d\u1eabn:<\/span><br\/> <b> Quy \u01b0\u1edbc l\u00e0m tr\u00f2n s\u1ed1 <\/b> <br\/> * N\u1ebfu ch\u1eef s\u1ed1 \u0111\u1ea7u ti\u00ean trong c\u00e1c ch\u1eef s\u1ed1 b\u1ecb b\u1ecf \u0111i nh\u1ecf h\u01a1n 5 th\u00ec ta gi\u1eef nguy\u00ean b\u1ed9 ph\u1eadn c\u00f2n l\u1ea1i. <br\/> * N\u1ebfu ch\u1eef s\u1ed1 \u0111\u1ea7u ti\u00ean trong c\u00e1c ch\u1eef s\u1ed1 b\u1ecb b\u1ecf \u0111i l\u1edbn h\u01a1n ho\u1eb7c b\u1eb1ng 5 th\u00ec c\u1ed9ng th\u00eam 1 v\u00e0o ch\u1eef s\u1ed1 cu\u1ed1i c\u00f9ng c\u1ee7a b\u1ed9 ph\u1eadn c\u00f2n l\u1ea1i. <br\/> * Trong tr\u01b0\u1eddng h\u1ee3p s\u1ed1 nguy\u00ean th\u00ec ta thay c\u00e1c ch\u1eef s\u1ed1 b\u1ecf \u0111i b\u1eb1ng c\u00e1c ch\u1eef s\u1ed1 0. <br\/><span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span><br\/> Chu vi c\u1ee7a h\u00ecnh vu\u00f4ng l\u00e0: <br\/> P = 12,4 . 4 = 49,6 (m) <br\/> L\u00e0m tr\u00f2n s\u1ed1 49,6 \u0111\u1ec5n ch\u1eef s\u1ed1 th\u1eadp ph\u1eadn th\u1ee9 nh\u1ea5t ta \u0111\u01b0\u1ee3c 49,6. <br\/> V\u1eady chu vi c\u1ee7a h\u00ecnh vu\u00f4ng l\u00e0 $\\approx 49,6 $m. <br\/> <br\/> <span class='basic_pink'> V\u1eady s\u1ed1 c\u1ea7n \u0111i\u1ec1n l\u00e0 49,6 (m) <\/span><\/span>"}]}],"id_ques":434},{"time":24,"part":[{"title":"\u0110i\u1ec1n s\u1ed1 th\u00edch h\u1ee3p v\u00e0o \u00f4 tr\u1ed1ng","title_trans":"","temp":"fill_the_blank","correct":[[["59"]]],"list":[{"point":5,"width":50,"type_input":"","ques":"Th\u1ef1c hi\u1ec7n ph\u00e9p t\u00ednh r\u1ed3i l\u00e0m tr\u00f2n k\u1ebft qu\u1ea3 \u0111\u1ebfn h\u00e0ng \u0111\u01a1n v\u1ecb? <br\/> $ P = \\dfrac{2961}{50} = $ _input_","explain":" <span class='basic_left'><span class='basic_green'>H\u01b0\u1edbng d\u1eabn:<\/span><br\/><b> Quy \u01b0\u1edbc l\u00e0m tr\u00f2n s\u1ed1 <\/b> <br\/> * N\u1ebfu ch\u1eef s\u1ed1 \u0111\u1ea7u ti\u00ean trong c\u00e1c ch\u1eef s\u1ed1 b\u1ecb b\u1ecf \u0111i nh\u1ecf h\u01a1n 5 th\u00ec ta gi\u1eef nguy\u00ean b\u1ed9 ph\u1eadn c\u00f2n l\u1ea1i. Trong tr\u01b0\u1eddng h\u1ee3p s\u1ed1 nguy\u00ean th\u00ec ta thay c\u00e1c ch\u1eef s\u1ed1 b\u1ecf \u0111i b\u1eb1ng c\u00e1c ch\u1eef s\u1ed1 0. <br\/> * N\u1ebfu ch\u1eef s\u1ed1 \u0111\u1ea7u ti\u00ean trong c\u00e1c ch\u1eef s\u1ed1 b\u1ecb b\u1ecf \u0111i l\u1edbn h\u01a1n ho\u1eb7c b\u1eb1ng 5 th\u00ec c\u1ed9ng th\u00eam 1 v\u00e0o ch\u1eef s\u1ed1 cu\u1ed1i c\u00f9ng c\u1ee7a b\u1ed9 ph\u1eadn c\u00f2n l\u1ea1i. Trong tr\u01b0\u1eddng h\u1ee3p s\u1ed1 nguy\u00ean th\u00ec ta thay c\u00e1c ch\u1eef s\u1ed1 b\u1ecf \u0111i b\u1eb1ng c\u00e1c ch\u1eef s\u1ed1 0. <\/span> <br\/><br\/><span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span><br\/> Ta c\u00f3: $P = \\dfrac{2961}{50} = 59.22$ <br\/> Ta nh\u1eadn th\u1ea5y s\u1ed1 59,22 c\u00f3 ch\u1eef s\u1ed1 h\u00e0ng \u0111\u01a1n v\u1ecb l\u00e0 9. <br\/> Ch\u1eef s\u1ed1 \u0111\u1ea7u ti\u00ean b\u1ecb b\u1ecf \u0111i l\u00e0 2 (nh\u1ecf h\u01a1n 5) n\u00ean ta gi\u1eef nguy\u00ean c\u00e1c s\u1ed1 c\u00f2n l\u1ea1i. <br\/> Ta \u0111\u01b0\u1ee3c $ 59,22 \\approx 59 $ <br\/> <br\/> <span class='basic_pink'> V\u1eady s\u1ed1 c\u1ea7n \u0111i\u1ec1n l\u00e0 59 <\/span><\/span>"}]}],"id_ques":435},{"time":24,"part":[{"title":"\u0110i\u1ec1n s\u1ed1 th\u00edch h\u1ee3p v\u00e0o \u00f4 tr\u1ed1ng","title_trans":"","temp":"fill_the_blank","correct":[[["288000"]]],"list":[{"point":5,"width":100,"type_input":"","ques":"L\u00e0m tr\u00f2n s\u1ed1 288079,3 \u0111\u1ebfn h\u00e0ng ngh\u00ecn ta \u0111\u01b0\u1ee3c k\u1ebft qu\u1ea3 l\u00e0: _input_","explain":" <span class='basic_left'><span class='basic_green'>H\u01b0\u1edbng d\u1eabn:<\/span><br\/> <b> Quy \u01b0\u1edbc l\u00e0m tr\u00f2n s\u1ed1 <\/b> <br\/> * N\u1ebfu ch\u1eef s\u1ed1 \u0111\u1ea7u ti\u00ean trong c\u00e1c ch\u1eef s\u1ed1 b\u1ecb b\u1ecf \u0111i nh\u1ecf h\u01a1n 5 th\u00ec ta gi\u1eef nguy\u00ean b\u1ed9 ph\u1eadn c\u00f2n l\u1ea1i. Trong tr\u01b0\u1eddng h\u1ee3p s\u1ed1 nguy\u00ean th\u00ec ta thay c\u00e1c ch\u1eef s\u1ed1 b\u1ecf \u0111i b\u1eb1ng c\u00e1c ch\u1eef s\u1ed1 0. <br\/> * N\u1ebfu ch\u1eef s\u1ed1 \u0111\u1ea7u ti\u00ean trong c\u00e1c ch\u1eef s\u1ed1 b\u1ecb b\u1ecf \u0111i l\u1edbn h\u01a1n ho\u1eb7c b\u1eb1ng 5 th\u00ec c\u1ed9ng th\u00eam 1 v\u00e0o ch\u1eef s\u1ed1 cu\u1ed1i c\u00f9ng c\u1ee7a b\u1ed9 ph\u1eadn c\u00f2n l\u1ea1i. Trong tr\u01b0\u1eddng h\u1ee3p s\u1ed1 nguy\u00ean th\u00ec ta thay c\u00e1c ch\u1eef s\u1ed1 b\u1ecf \u0111i b\u1eb1ng c\u00e1c ch\u1eef s\u1ed1 0. <\/span> <br\/><br\/><span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span><br\/> Ta nh\u1eadn th\u1ea5y s\u1ed1 288079,3 c\u00f3 ch\u1eef s\u1ed1 h\u00e0ng ngh\u00ecn l\u00e0 8. <br\/> Ch\u1eef s\u1ed1 \u0111\u1ea7u ti\u00ean b\u1ecb b\u1ecf \u0111i l\u00e0 0 (nh\u1ecf h\u01a1n 5) n\u00ean ta gi\u1eef nguy\u00ean b\u1ed9 ph\u1eadn c\u00f2n l\u1ea1i. <br\/> Ta \u0111\u01b0\u1ee3c $ 288079,3 \\approx 288000 $ <br\/> <br\/> <span class='basic_pink'> V\u1eady s\u1ed1 c\u1ea7n \u0111i\u1ec1n l\u00e0 288000. <\/span><\/span>"}]}],"id_ques":436},{"time":24,"part":[{"title":"\u0110i\u1ec1n s\u1ed1 th\u00edch h\u1ee3p v\u00e0o \u00f4 tr\u1ed1ng","title_trans":"","temp":"fill_the_blank","correct":[[["50,41"]]],"list":[{"point":5,"width":80,"type_input":"","ques":"L\u00e0m tr\u00f2n s\u1ed1 50,411 \u0111\u1ebfn ch\u1eef s\u1ed1 th\u1eadp ph\u00e2n th\u1ee9 hai ta \u0111\u01b0\u1ee3c k\u1ebft qu\u1ea3 l\u00e0: _input_","hint":" Ch\u1eef s\u1ed1 th\u1eadp ph\u00e2n th\u1ee9 hai l\u00e0 1. <br\/> Ch\u1eef s\u1ed1 \u0111\u1ea7u ti\u00ean b\u1ecb b\u1ecf \u0111i l\u00e0 1 (nh\u1ecf h\u01a1n 5). ","explain":" <span class='basic_left'><span class='basic_green'>H\u01b0\u1edbng d\u1eabn:<\/span><br\/> <b> Quy \u01b0\u1edbc l\u00e0m tr\u00f2n s\u1ed1 <\/b> <br\/> * N\u1ebfu ch\u1eef s\u1ed1 \u0111\u1ea7u ti\u00ean trong c\u00e1c ch\u1eef s\u1ed1 b\u1ecb b\u1ecf \u0111i nh\u1ecf h\u01a1n 5 th\u00ec ta gi\u1eef nguy\u00ean b\u1ed9 ph\u1eadn c\u00f2n l\u1ea1i. Trong tr\u01b0\u1eddng h\u1ee3p s\u1ed1 nguy\u00ean th\u00ec ta thay c\u00e1c ch\u1eef s\u1ed1 b\u1ecf \u0111i b\u1eb1ng c\u00e1c ch\u1eef s\u1ed1 0. <br\/> * N\u1ebfu ch\u1eef s\u1ed1 \u0111\u1ea7u ti\u00ean trong c\u00e1c ch\u1eef s\u1ed1 b\u1ecb b\u1ecf \u0111i l\u1edbn h\u01a1n ho\u1eb7c b\u1eb1ng 5 th\u00ec c\u1ed9ng th\u00eam 1 v\u00e0o ch\u1eef s\u1ed1 cu\u1ed1i c\u00f9ng c\u1ee7a b\u1ed9 ph\u1eadn c\u00f2n l\u1ea1i. Trong tr\u01b0\u1eddng h\u1ee3p s\u1ed1 nguy\u00ean th\u00ec ta thay c\u00e1c ch\u1eef s\u1ed1 b\u1ecf \u0111i b\u1eb1ng c\u00e1c ch\u1eef s\u1ed1 0. <\/span> <br\/><br\/><span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span><br\/> Ta nh\u1eadn th\u1ea5y s\u1ed1 50,411 c\u00f3 ch\u1eef s\u1ed1 th\u1eadp ph\u00e2n th\u1ee9 hai l\u00e0 1. <br\/> Ch\u1eef s\u1ed1 \u0111\u1ea7u ti\u00ean b\u1ecb b\u1ecf \u0111i l\u00e0 1 (nh\u1ecf h\u01a1n 5) n\u00ean ta gi\u1eef nguy\u00ean b\u1ed9 ph\u1eadn c\u00f2n l\u1ea1i. <br\/> Ta \u0111\u01b0\u1ee3c $ 50,411 \\approx 50,41 $ <br\/> <br\/> <span class='basic_pink'> V\u1eady s\u1ed1 c\u1ea7n \u0111i\u1ec1n l\u00e0 50,41. <\/span><\/span>"}]}],"id_ques":437},{"time":24,"part":[{"title":"\u0110i\u1ec1n s\u1ed1 th\u00edch h\u1ee3p v\u00e0o \u00f4 tr\u1ed1ng","title_trans":"","temp":"fill_the_blank","correct":[[["9440"]]],"list":[{"point":5,"width":80,"type_input":"","ques":"L\u00e0m tr\u00f2n s\u1ed1 9436 \u0111\u1ebfn h\u00e0ng ch\u1ee5c ta \u0111\u01b0\u1ee3c k\u1ebft qu\u1ea3 l\u00e0:_input_","explain":" <span class='basic_left'><span class='basic_green'>H\u01b0\u1edbng d\u1eabn:<\/span><br\/> <b> Quy \u01b0\u1edbc l\u00e0m tr\u00f2n s\u1ed1 <\/b> <br\/> * N\u1ebfu ch\u1eef s\u1ed1 \u0111\u1ea7u ti\u00ean trong c\u00e1c ch\u1eef s\u1ed1 b\u1ecb b\u1ecf \u0111i nh\u1ecf h\u01a1n 5 th\u00ec ta gi\u1eef nguy\u00ean b\u1ed9 ph\u1eadn c\u00f2n l\u1ea1i. Trong tr\u01b0\u1eddng h\u1ee3p s\u1ed1 nguy\u00ean th\u00ec ta thay c\u00e1c ch\u1eef s\u1ed1 b\u1ecf \u0111i b\u1eb1ng c\u00e1c ch\u1eef s\u1ed1 0. <br\/> * N\u1ebfu ch\u1eef s\u1ed1 \u0111\u1ea7u ti\u00ean trong c\u00e1c ch\u1eef s\u1ed1 b\u1ecb b\u1ecf \u0111i l\u1edbn h\u01a1n ho\u1eb7c b\u1eb1ng 5 th\u00ec c\u1ed9ng th\u00eam 1 v\u00e0o ch\u1eef s\u1ed1 cu\u1ed1i c\u00f9ng c\u1ee7a b\u1ed9 ph\u1eadn c\u00f2n l\u1ea1i. Trong tr\u01b0\u1eddng h\u1ee3p s\u1ed1 nguy\u00ean th\u00ec ta thay c\u00e1c ch\u1eef s\u1ed1 b\u1ecf \u0111i b\u1eb1ng c\u00e1c ch\u1eef s\u1ed1 0. <\/span> <br\/><br\/><span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span><br\/> Ta nh\u1eadn th\u1ea5y s\u1ed1 9436 c\u00f3 ch\u1eef s\u1ed1 h\u00e0ng ch\u1ee5c l\u00e0 3. <br\/> Ch\u1eef s\u1ed1 \u0111\u1ea7u ti\u00ean b\u1ecb b\u1ecf \u0111i l\u00e0 6 (l\u1edbn h\u01a1n 5) n\u00ean ph\u1ea3i c\u1ed9ng th\u00eam 1 v\u00e0o 3. <br\/> V\u00ec 9436 l\u00e0 s\u1ed1 nguy\u00ean n\u00ean ta thay ch\u1eef s\u1ed1 b\u1ecb b\u1ecf \u0111i b\u1eb1ng s\u1ed1 0. <br\/> Ta \u0111\u01b0\u1ee3c $ 9436 \\approx 9440 $ <br\/> <br\/> <span class='basic_pink'> V\u1eady s\u1ed1 c\u1ea7n \u0111i\u1ec1n l\u00e0 9440. <\/span><\/span>"}]}],"id_ques":438},{"time":24,"part":[{"title":"\u0110i\u1ec1n s\u1ed1 th\u00edch h\u1ee3p v\u00e0o \u00f4 tr\u1ed1ng","title_trans":"","temp":"fill_the_blank","correct":[[["56900"]]],"list":[{"point":5,"width":100,"type_input":"","ques":"L\u00e0m tr\u00f2n s\u1ed1 56873 \u0111\u1ebfn h\u00e0ng tr\u0103m ta \u0111\u01b0\u1ee3c k\u1ebft qu\u1ea3 l\u00e0: _input_","explain":" <span class='basic_left'><span class='basic_green'>H\u01b0\u1edbng d\u1eabn:<\/span><br\/><b> Quy \u01b0\u1edbc l\u00e0m tr\u00f2n s\u1ed1 <\/b> <br\/> * N\u1ebfu ch\u1eef s\u1ed1 \u0111\u1ea7u ti\u00ean trong c\u00e1c ch\u1eef s\u1ed1 b\u1ecb b\u1ecf \u0111i nh\u1ecf h\u01a1n 5 th\u00ec ta gi\u1eef nguy\u00ean b\u1ed9 ph\u1eadn c\u00f2n l\u1ea1i. Trong tr\u01b0\u1eddng h\u1ee3p s\u1ed1 nguy\u00ean th\u00ec ta thay c\u00e1c ch\u1eef s\u1ed1 b\u1ecf \u0111i b\u1eb1ng c\u00e1c ch\u1eef s\u1ed1 0. <br\/> * N\u1ebfu ch\u1eef s\u1ed1 \u0111\u1ea7u ti\u00ean trong c\u00e1c ch\u1eef s\u1ed1 b\u1ecb b\u1ecf \u0111i l\u1edbn h\u01a1n ho\u1eb7c b\u1eb1ng 5 th\u00ec c\u1ed9ng th\u00eam 1 v\u00e0o ch\u1eef s\u1ed1 cu\u1ed1i c\u00f9ng c\u1ee7a b\u1ed9 ph\u1eadn c\u00f2n l\u1ea1i. Trong tr\u01b0\u1eddng h\u1ee3p s\u1ed1 nguy\u00ean th\u00ec ta thay c\u00e1c ch\u1eef s\u1ed1 b\u1ecf \u0111i b\u1eb1ng c\u00e1c ch\u1eef s\u1ed1 0. <\/span> <br\/><br\/><span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span><br\/> Ta nh\u1eadn th\u1ea5y s\u1ed1 56873 c\u00f3 ch\u1eef s\u1ed1 h\u00e0ng tr\u0103m l\u00e0 8. <br\/> Ch\u1eef s\u1ed1 \u0111\u1ea7u ti\u00ean b\u1ecb b\u1ecf \u0111i l\u00e0 7 (l\u1edbn h\u01a1n 5) n\u00ean ph\u1ea3i c\u1ed9ng th\u00eam 1 v\u00e0o 8. <br\/> V\u00ec 56873 l\u00e0 s\u1ed1 nguy\u00ean n\u00ean ta thay ch\u1eef s\u1ed1 b\u1ecb b\u1ecf \u0111i b\u1eb1ng s\u1ed1 0. <br\/> Ta \u0111\u01b0\u1ee3c $ 56873 \\approx 56900 $ <br\/> <br\/> <span class='basic_pink'> V\u1eady s\u1ed1 c\u1ea7n \u0111i\u1ec1n l\u00e0 56900. <\/span><\/span>"}]}],"id_ques":439},{"time":24,"part":[{"title":"\u0110i\u1ec1n s\u1ed1 th\u00edch h\u1ee3p v\u00e0o \u00f4 tr\u1ed1ng","title_trans":"","temp":"fill_the_blank","correct":[[["21000"]]],"list":[{"point":5,"width":110,"type_input":"","ques":"L\u00e0m tr\u00f2n s\u1ed1 20890 \u0111\u1ebfn h\u00e0ng ngh\u00ecn ta \u0111\u01b0\u1ee3c k\u1ebft qu\u1ea3 l\u00e0:_input_","explain":" <span class='basic_left'><span class='basic_green'>H\u01b0\u1edbng d\u1eabn:<\/span><br\/> <b> Quy \u01b0\u1edbc l\u00e0m tr\u00f2n s\u1ed1 <\/b> <br\/> * N\u1ebfu ch\u1eef s\u1ed1 \u0111\u1ea7u ti\u00ean trong c\u00e1c ch\u1eef s\u1ed1 b\u1ecb b\u1ecf \u0111i nh\u1ecf h\u01a1n 5 th\u00ec ta gi\u1eef nguy\u00ean b\u1ed9 ph\u1eadn c\u00f2n l\u1ea1i. Trong tr\u01b0\u1eddng h\u1ee3p s\u1ed1 nguy\u00ean th\u00ec ta thay c\u00e1c ch\u1eef s\u1ed1 b\u1ecf \u0111i b\u1eb1ng c\u00e1c ch\u1eef s\u1ed1 0. <br\/> * N\u1ebfu ch\u1eef s\u1ed1 \u0111\u1ea7u ti\u00ean trong c\u00e1c ch\u1eef s\u1ed1 b\u1ecb b\u1ecf \u0111i l\u1edbn h\u01a1n ho\u1eb7c b\u1eb1ng 5 th\u00ec c\u1ed9ng th\u00eam 1 v\u00e0o ch\u1eef s\u1ed1 cu\u1ed1i c\u00f9ng c\u1ee7a b\u1ed9 ph\u1eadn c\u00f2n l\u1ea1i. Trong tr\u01b0\u1eddng h\u1ee3p s\u1ed1 nguy\u00ean th\u00ec ta thay c\u00e1c ch\u1eef s\u1ed1 b\u1ecf \u0111i b\u1eb1ng c\u00e1c ch\u1eef s\u1ed1 0. <\/span> <br\/><br\/><span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span><br\/> Ta nh\u1eadn th\u1ea5y s\u1ed1 20890 c\u00f3 ch\u1eef s\u1ed1 h\u00e0ng ngh\u00ecn l\u00e0 0. <br\/> Ch\u1eef s\u1ed1 \u0111\u1ea7u ti\u00ean b\u1ecb b\u1ecf \u0111i l\u00e0 8 (l\u1edbn h\u01a1n 5) n\u00ean ph\u1ea3i c\u1ed9ng th\u00eam 1 v\u00e0o 0. <br\/> V\u00ec 20890 l\u00e0 s\u1ed1 nguy\u00ean n\u00ean ta thay ch\u1eef s\u1ed1 b\u1ecb b\u1ecf \u0111i b\u1eb1ng s\u1ed1 0. <br\/> Ta \u0111\u01b0\u1ee3c $ 20890 \\approx 21000 $ <br\/> <br\/> <span class='basic_pink'> V\u1eady s\u1ed1 c\u1ea7n \u0111i\u1ec1n l\u00e0 20100. <\/span><\/span>"}]}],"id_ques":440}],"lesson":{"save":0,"level":2}}