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
化简x²+xy/x²-xy÷(x+y)÷-x/y²-xy
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