Решение:
(7x3y2-xy)×(-2x2y2+5xy3) = 7x3y2×(-2x2y2) + 7x3y2×5xy3 + (-xy)×(-2x2y2) + (-xy)×5xy3 = -14x5y4 + 35x4y5 + 2x3y3 - 5x2y4
Ответ: -14x5y4 + 35x4y5 + 2x3y3 - 5x2y4