в) $$(-2a^2b^3)^3 \cdot (-0,5ab^9)^3 = (-2)^3 \cdot (a^2)^3 \cdot (b^3)^3 \cdot (-0,5)^3 \cdot a^3 \cdot (b^9)^3 = -8a^6b^9 \cdot (-0,125)a^3b^{27} = -8 \cdot (-0,125) \cdot a^{6+3} \cdot b^{9+27} = 1a^9b^{36} = a^9b^{36}$$.
Ответ: $$a^9b^{36}$$