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Hãy nhập câu hỏi của bạn vào đây, nếu là tài khoản VIP, bạn sẽ được ưu tiên trả lời. \(\left(\frac{3}{8}+-\frac{3}{4}+\frac{7}{12}\right):\frac{5}{6}+\frac{1}{2}\) \(=\left(\frac{9}{24}+-\frac{18}{24}+\frac{14}{24}\right):\frac{5}{6}+\frac{1}{2}\) \(=\frac{5}{24}:\frac{5}{6}+\frac{1}{2}\) \(=\frac{5}{24}.\frac{6}{5}+\frac{1}{2}\) \(=\frac{1}{4}+\frac{1}{2}\) \(=\frac{1}{4}+\frac{2}{4}\) \(=\frac{3}{4}\) \(\frac{1}{2}+\frac{3}{4}-\left(\frac{3}{4}-\frac{4}{5}\right)\) \(=\frac{1}{2}+\frac{3}{4}-\left(\frac{15}{20}-\frac{16}{20}\right)\) \(=\frac{1}{2}+\frac{3}{4}-\frac{-1}{20}\) \(=\frac{10}{20}+\frac{15}{20}-\frac{-1}{20}\) \(=\frac{25}{20}-\frac{-1}{20}\) \(=\frac{26}{20}\) \(=\frac{13}{10}\) a)\(\frac{2}{3}+\frac{3}{4}+\frac{5}{6}\) \(=\frac{8+9+10}{12}\) \(=\frac{27}{12}=\frac{9}{4}\) b)\(\frac{15}{8}-\frac{7}{12}+\frac{5}{6}\) \(=\frac{45-14+20}{24}\) \(=\frac{51}{24}=\frac{17}{8}\) 2) a)\(\frac{2}{5}+\frac{7}{13}+\frac{3}{5}+\frac{1}{7}\) \(=\frac{2}{5}+\frac{3}{5}+\frac{7}{13}+\frac{1}{7}\) \(=1+\frac{7}{13}+\frac{1}{7}\) \(=\frac{20}{13}+\frac{1}{7}\) \(=\frac{153}{91}\) Tí tớ trả lời tiếp a. \(\frac{2}{3}+\frac{1}{3}.\left(\frac{-4}{9}+\frac{5}{6}\right):\frac{7}{12}\) \(=1.\frac{7}{12}:\frac{7}{12}\) \(=1\) b. \(\frac{5}{9}.\frac{8}{11}+\frac{5}{9}.\frac{9}{11}-\frac{5}{9}.\frac{6}{11}\) \(=\frac{5}{9}.\left(\frac{8}{11}+\frac{9}{11}-\frac{6}{11}\right)\) \(=\frac{5}{9}.1\) \(=\frac{5}{9}\) Tk mk nha! b) \(=\frac{5}{9}.\left(\frac{8}{11}+\frac{9}{11}-\frac{6}{11}\right)\) \(=\frac{5}{9}.1\) \(=\frac{5}{9}\) \(A=\left(\frac{3}{8}+\frac{-3}{4}+\frac{7}{12}\right):\frac{5}{6}+\frac{1}{2}\) \(A=\left(\frac{3}{8}+\frac{-6}{8}+\frac{7}{12}\right):\frac{5}{6}+\frac{1}{2}\) \(A=\left(\frac{-3}{8}+\frac{7}{12}\right):\frac{5}{6}+\frac{1}{2}\) \(A=\left(\frac{-36}{24}+\frac{56}{24}\right):\frac{5}{6}+\frac{1}{2}\) \(A=\frac{5}{6}:\frac{5}{6}+\frac{1}{2}\) \(A=\frac{5}{6}\times\frac{6}{5}+\frac{1}{2}\) \(A=1+\frac{1}{2}\) \(A=\frac{1}{1}+\frac{1}{2}=\frac{2}{2}+\frac{1}{2}\) \(A=\frac{3}{2}\) a. \(1\frac{5}{7}\)-\(\frac{9}{7}\)*\(\frac{16}{9}\) =\(\frac{12}{7}\)-\(\frac{16}{7}\) =\(\frac{-4}{7}\) b. \(\frac{-5}{8}\):\(\frac{1}{4}\)-\(\frac{6}{13}\)*4+\(\frac{3}{8}\) =\(\frac{-5}{8}\cdot\)4-\(\frac{6}{13}\)*4+\(\frac{3}{8}\) =4*(\(\frac{-5}{8}\)-\(\frac{6}{13}\))+\(\frac{3}{8}\) =4*\(\frac{-113}{104}\)+\(\frac{3}{8}\) =\(\frac{-113}{26}\)+\(\frac{3}{8}\) =\(\frac{-413}{104}\) c.( \(\frac{3}{8}\)+\(\frac{-1}{4}\)-\(\frac{5}{12}\)):\(\frac{1}{3}\) =\(\frac{-7}{24}\)*3 =\(\frac{-7}{8}\) Học tốt a) \(\left(\frac{-1}{6}+\frac{5}{-12}\right)+\frac{7}{12}=\left(\frac{-2}{12}+\frac{-5}{12}\right)+\frac{7}{12}=\left(\frac{-7}{12}\right)+\frac{7}{12}=0\) b)\(\frac{7}{36}-\frac{8}{-9}+\frac{-2}{3}=\frac{7}{36}+\frac{32}{36}-\frac{24}{36}=\frac{15}{36}=\frac{5}{12}\) c) \(\frac{3}{5}-\frac{2}{5}.\frac{10}{12}=\frac{3}{5}-\frac{2}{5}.\frac{5}{6}=\frac{3}{5}-\frac{1}{3}=\frac{9}{15}-\frac{5}{15}=\frac{4}{15}\) d) \(\frac{2}{\left(-3\right)^2}+\frac{5}{-13}-\frac{-3}{4}=\frac{2}{9}-\frac{5}{13}+\frac{3}{4}=\frac{8}{36}-\frac{15}{36}+\frac{27}{36}=\frac{5}{9}\) kazuto kirigaya thật là bt làm ko đó ko bt thì nói đi còn bt thì làm đi a)\(=\frac{13}{4}-\frac{1}{3}\) \(=\frac{35}{12}\) b)\(=\left(\frac{7}{6}-\frac{1}{2}\right).\frac{2}{3}-\frac{1}{4}\) \(=\frac{2}{3}.\frac{2}{3}-\frac{1}{4}\left(=1-\frac{1}{4}\right)\) \(=\frac{4}{9}-\frac{1}{4}\left(=\frac{3}{4}\right)\) \(=\frac{7}{36}\)
K
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CM
Cao Minh Tâm
1 tháng 9 2017
Đúng(0)
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