9) $$ \frac{3}{4} - 2^2 \cdot \frac{2}{5} = \frac{3}{4} - 4 \cdot \frac{2}{5} = \frac{3}{4} - \frac{8}{5} = \frac{15 - 32}{20} = -\frac{17}{20} $$
Ответ: $$\frac{-17}{20}$$