化简x²+xy/x²-xy÷(x+y)÷-x/y²-xy

来源：学生作业学帮网编辑：学帮网时间：2024/06/01 06:58:14

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