计算(x^2-y^2)/(x+y)-[4x(x-y)x+y^2]/2x-y
1个回答
(x^2-y^2)/(x+y)=x-y
[4x(x-y)x+y^2]/2x-y=(2x-y)^2/2x-y=2x-y
因此原式=x-y-(2x-y) = -x
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