化简x²+xy/x²-xy÷(x+y)÷-x/y²-xy

分类: 作业答案 • 2021-12-29 14:58:49

问题描述：

答

原式=x(x+y)/x(x-y)*1/(x+y)*y(x-y)/x
=(x+y)/(x-y)*1/(x+y)*y(x-y)/x
=1/(x-y)*y(x-y)/x
=y/x