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(x-y+x-y分之4xy)乘(x+y-x+y分之4xy)=?
题目详情
(x-y+x-y分之4xy)乘(x+y-x+y分之4xy)=?
▼优质解答
答案和解析
=[(x-y)²+4xy]/(x-y)×[(x+y)²-4]/(x+y)
=(x+y)²/(x-y)×(x-y)²/(x+y)
=(x+y)(x-y)
=x²-y²
=(x+y)²/(x-y)×(x-y)²/(x+y)
=(x+y)(x-y)
=x²-y²
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