若x=100,y=99,求(x-y+4xy/x-y)(x+y-4xy/x+y)
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若x=100,y=99,求(x-y+4xy/x-y)(x+y-4xy/x+y)
若x=100,y=99,求(x-y+4xy/x-y)(x+y-4xy/x+y)
若x=100,y=99,求(x-y+4xy/x-y)(x+y-4xy/x+y)
(x-y+4xy/x-y)(x+y-4xy/x+y)
={[(x-y)^+4xy]/(x-y)}{[(x+y)^-4xy]/(x+y)}
=[(x+y)^/(x-y)][(x-y)^/(x+y)]
=(x+y)(x-y)
=199
若x=100,y=99,求(x-y+4xy/x-y)(x+y-4xy/x+y)
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