в) $$2 + \frac{5}{16} \cdot (-2)^3 = 2 + \frac{5}{16} \cdot (-8) = 2 - \frac{5 \cdot 8}{16} = 2 - \frac{5}{2} = 2 - 2.5 = -0.5 $$
Ответ: -0.5