(x-y+4xy/x-y）（x+y-4xy/x+y）
是个平方差式.（a+b)(a-b)=a^2-b^2)
(x-(y-4xy/x+y)）（x+(y-4xy/x+y)）=x^2-(y-4xy/x+y)^2
=100^2-（99-4*99+99）^2=zijisuan
看看题有误吗?
若x=100,y=99,求(x-y+4xy/x-y）（x+y-4xy/x+y）最好把它写在纸上照下来
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