Ответ:

24a^13

-100a^25

-2 a^31 b^9

-64/25 * m^7 * n^13

Объяснение:

6a^3 * (2a^5)^2 = 6a^3 * 4a^10 = 24a^13

-0.8a^4 * (5a^7)^3 = -0.8a^4 * 125a^21 = -100a^25

(-2 b^2 a^7)^4 * (-1/8 a^3 b) = 16 b^8 a^28 *(-1/8) a^3 b = -2 a^31 b^9

(-4/5 m n^4)^3 * 25m^4n = -64/125 * m^3* n^12 * 25 * m^4 * n = -64/25 * m^7 * n^13