Ответ:

\(3\frac{5}{9}=\frac{32}{9}\), \(0.64=\frac{16}{25}\). Тогда \(\frac{32}{9}:\frac{16}{25}=\frac{50}{9}\), и \(\frac{50}{9}-8=-\frac{22}{9}=-2\frac{4}{9}\).

Ответ: \(-2\frac{4}{9}\)