化简分式{X-Y+(4XY)/(X-Y)}{X+Y-(4XY)/(X+Y)}的结果是?
2个回答
原式={[(x-y)^2+4xy]/(x-y)}{[(x+y)^2-4xy]/x+y}
={[(x+y)^2]/(x-y)}{[(x-y)^2]/x+y}
=(x+y)(x-y)=x^2-y^2
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