(y+1/x-y)的平方减去(y-1/x-y)的平方等於多少

分类: 作业答案 • 2022-07-02 20:42:24

问题描述：

答

[(y+1/(x-y))-(y-1/(x-y))][(y+1/(x-y))+(y-1/(x-y))]=
2/(x-y) * 2y=4y/(x-y)