计算(3a^2b-7ab^2-a^2b^2)`5ab

问题描述:

计算(3a^2b-7ab^2-a^2b^2)`5ab

(3a^2b-7ab^2-a^2b^2)*5ab
=15a^3b^2-35a^2b^3-5a^3b^3