17. Найдите значение выражения. 1. а) 2/3 − 5/18; б) 5/6 + 1 3/4; в) 3 7/24 − 1 11/18; г) 12 5/6 : 3 2/3; д) 3 1/5 · 2 7/24. 2. а) (5 3/20 + 3 3/10) : 11/12; б) (1 1/2 + 2 2/3) : 3 3/4 − 2/5.

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а) \(\frac{2}{3}-\frac{5}{18}=\frac{12}{18}-\frac{5}{18}=\frac{7}{18}\).
б) \(\frac{5}{6}+1\frac{3}{4}=\frac{10}{12}+\frac{21}{12}=\frac{31}{12}=2\frac{7}{12}\).
в) \(3\frac{7}{24}-1\frac{11}{18}=\frac{259}{72}-\frac{116}{72}=\frac{143}{72}=1\frac{71}{72}\).
г) \(12\frac{5}{6}:3\frac{2}{3}=\frac{77}{6}:\frac{11}{3}=\frac{77}{6}\cdot\frac{3}{11}=\frac{7}{2}=3\frac{1}{2}\).
д) \(3\frac{1}{5}\cdot2\frac{7}{24}=\frac{16}{5}\cdot\frac{55}{24}=\frac{22}{3}=7\frac{1}{3}\).
а) \((5\frac{3}{20}+3\frac{3}{10}):\frac{11}{12}=\frac{169}{20}\cdot\frac{12}{11}=\frac{507}{55}=9\frac{12}{55}\).
б) \((1\frac{1}{2}+2\frac{2}{3}):3\frac{3}{4}-\frac{2}{5}=\frac{25}{6}\cdot\frac{4}{15}-\frac{2}{5}=\frac{10}{9}-\frac{2}{5}=\frac{32}{45}\).

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