470. Найдите значение выражения: 1) −5/8 + 1/4 + 7/12; 2) 1/5 + (−1/7) + 2/9; 3) −1/8 + 3/9 + (−5/36); 4) 7/8 + (−4/5) + (−1 1/20); 5) −11/18 + 5/12 + 7 1/9; 6) 2 4/15 + 2/5 + (−5 1/6).

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Accepted Answer

\(-\frac{5}{8}+\frac{1}{4}+\frac{7}{12}=\frac{-15+6+14}{24}=\frac{5}{24}\).
\(\frac{1}{5}-\frac{1}{7}+\frac{2}{9}=\frac{63-45+70}{315}=\frac{88}{315}\).
\(-\frac{1}{8}+\frac{3}{9}-\frac{5}{36}=\frac{-9+24-10}{72}=\frac{5}{72}\).
\(\frac{7}{8}-\frac{4}{5}-1\frac{1}{20}=\frac{35-32-42}{40}=-\frac{39}{40}\).
\(-\frac{11}{18}+\frac{5}{12}+7\frac{1}{9}=7+\frac{-22+15+4}{36}=6\frac{11}{12}\).
\(2\frac{4}{15}+\frac{2}{5}-5\frac{1}{6}=-3+\frac{8+12-35}{30}=-3\frac{1}{2}\).

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