计算先化简,再求值:[(x-y)^2+(x+y)(x-y)]÷2x,其中x=3,y=7

分类: 作业答案 • 2022-01-02 13:30:37

问题描述：

答

:[(x-y)^2+(x+y)(x-y)]÷2x=(x-y)(x-y+x+y)÷2x=x-y x-y=3-7=-4

答

[(x-y)²+（x+y)(x-y)]÷2x
=(x-y)(x-y+x+y)÷2x
=2x(x-y)÷2x
=x-y
=3-7
=-4