3/7 + ( -5/2 ) + ( -3/5 ) =
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Mình làm hơi chậm ạ :
\(Q=\frac{0,4-\frac{2}{9}+\frac{2}{11}}{1,4+\frac{7}{9}+\frac{7}{11}}-\frac{\frac{1}{3}-0,25+\frac{1}{5}}{1\frac{1}{6}-0,875+0,7}\)
\(\Rightarrow Q=\frac{\frac{2}{5}-\frac{2}{9}+\frac{2}{11}}{\frac{7}{5}+\frac{7}{9}+\frac{7}{11}}-\frac{\frac{2}{3}-\frac{2}{8}+\frac{2}{10}}{\frac{7}{6}-\frac{7}{8}+\frac{7}{10}}\)
\(\Rightarrow Q=\frac{2.\left(\frac{1}{5}-\frac{1}{9}+\frac{1}{11}\right)}{7.\left(\frac{1}{5}+\frac{1}{9}+\frac{1}{11}\right)}-\frac{2.\left(\frac{1}{3}-\frac{1}{8}+\frac{1}{10}\right)}{7.\left(\frac{1}{6}-\frac{1}{8}+\frac{1}{10}\right)}\)
\(\Rightarrow Q=\frac{2}{7}-\frac{2}{7}=0\)
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\(\left(\frac{-3}{4}+\frac{2}{5}\right):\frac{3}{7}+\left(\frac{3}{5}+\frac{-1}{4}\right):\frac{3}{7}\)
\(=\frac{3}{7}:\left(\frac{-3}{4}+\frac{2}{5}\right)+\left(\frac{3}{5}+\frac{-1}{4}\right)\)
\(=\frac{3}{7}:\left(\frac{-15}{20}+\frac{8}{20}\right)+\left(\frac{12}{20}+\frac{-5}{20}\right)\)
\(=\frac{3}{7}:\left(\frac{-7}{20}+\frac{7}{20}\right)\)
\(=\frac{3}{7}:\frac{-1}{20}=\frac{3}{7}.\frac{20}{-1}=\frac{60}{-7}=\frac{-60}{7}\)
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là ( -187 / 70 ) nha
\(\frac{3}{7}+\left(-\frac{5}{2}\right)+\left(-\frac{3}{5}\right)\)
\(=\)\(\frac{30}{70}+\left(-\frac{175}{70}\right)+\left(-\frac{42}{70}\right)\)
\(=\)\(-\frac{187}{70}\)