Ответ:
а)
\(8\frac{7}{12}=\frac{307}{36}\), \(2\frac{17}{36}=\frac{89}{36}\).
\(\left(\frac{307}{36}-\frac{89}{36}\right)\cdot 2,7=\frac{218}{36}\cdot\frac{27}{10}=\frac{109}{18}\cdot\frac{27}{10}=\frac{327}{20}\).
\(4\frac{1}{3}:0,65=\frac{13}{3}:\frac{13}{20}=\frac{20}{3}\).
\(\frac{327}{20}-\frac{20}{3}=\frac{981-400}{60}=\frac{581}{60}=9\frac{41}{60}\).
б)
\(6\frac{2}{3}\cdot 0,2:\frac{1}{6}=\frac{20}{3}\cdot\frac{1}{5}\cdot 6=8\).
\(\left(8-3\frac{5}{9}\right):2=\left(8-\frac{32}{9}\right):2=\frac{40}{9}:2=\frac{20}{9}\).
\(\frac{20}{9}+8\frac{1}{15}=\frac{20}{9}+\frac{121}{15}=\frac{100+363}{45}=\frac{463}{45}=10\frac{13}{45}\).
Ответ: а) \(9\frac{41}{60}\); б) \(10\frac{13}{45}\).
