题目

[(x+2y)(x-2y)-(2x-y)^2+(3x-y))2x-5y)]/(-x)
我急用

提问时间：2020-11-02

答案

[(x+2y)(x-2y)-(2x-y)^2+(3x-y))2x-5y)]/(-x)
=(x²-4y²)-(4x²-4xy+y²)+(6x²-17xy+5y²)/(-x)
=(3x²-13xy)/(-x)
=-3x+13y