в) $$ (-2x^3)^4 \cdot 10x^3 = (-2)^4 \cdot (x^3)^4 \cdot 10x^3 = 16 \cdot x^{12} \cdot 10x^3 = 16 \cdot 10 \cdot x^{12} \cdot x^3 = 160x^{15} $$.
Ответ: $$160x^{15}$$