(2xy/x2-y2)+(x+y/x)-(y/y-x)

分类: 作业答案 • 2022-02-04 16:39:23

问题描述：

(2xy/x2-y2)+(x+y/x)-(y/y-x)
计算

答

(2xy/x2-y2)+(x/x+y)-(y/y-x)
=(2xy+x²-xy+xy+y²)/(x+y)(x-y)
=(x+y)²/(x+y)(x-y)
=(x+y)/(x-y)