3) (-10m²y³)5;

3) $$(-10m^2y^3)^5 = (-10)^5 \cdot (m^2)^5 \cdot (y^3)^5 = -100000m^{2\cdot 5}y^{3\cdot 5} = -100000m^{10}y^{15}$$

Ответ: $$-100000m^{10}y^{15}$$