Ответ:
а) \(3,4+1\frac{5}{7}=\frac{17}{5}+\frac{12}{7}=\frac{119+60}{35}=\frac{179}{35}=5\frac{4}{35}\).
б) \(5\frac{1}{3}-3,2=\frac{16}{3}-\frac{16}{5}=\frac{80-48}{15}=\frac{32}{15}=2\frac{2}{15}\).
в) \(2,88\cdot\frac{25}{72}=\frac{288}{100}\cdot\frac{25}{72}=\frac{72}{25}\cdot\frac{25}{72}=1\).
г) \(2\frac{2}{3}:0,03=\frac{8}{3}:\frac{3}{100}=\frac{8}{3}\cdot\frac{100}{3}=\frac{800}{9}=88\frac{8}{9}\).
Ответ: а) \(5\frac{4}{35}\); б) \(2\frac{2}{15}\); в) \(1\); г) \(88\frac{8}{9}\).
