1) -3x3y4x54y3 = -3 · 4 · x3 · x5 · y4 · y3 = -12x3+5y4+3 = -12x8y7
2) (-4a6b)3 = (-4)3(a6)3b3 = -64a6·3b3 = -64a18b3
Ответ: 1) -12x8y7, 2) -64a18b3