y/(x+y)-x/(x-y)=?怎么算?

来源：学生作业帮编辑：神马作文网作业帮分类：数学作业时间：2024/11/14 13:33:19

y/(x+y)-x/(x-y)
=y(x-y)/(x²-y²)-x(x+y)/(x²-y²)
=[y(x-y)-x(x+y)]/(x²-y²)
=(xy-y²-x²-xy)/(x²-y²)
=-(x²+y²)/(x²-y²)

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