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(x²+y²)²-4x²y²
人气:267 ℃ 时间:2020-05-08 07:05:32
解答
(x²+y²)²-4x²y²=(x²+y²)²-(2xy)²=[(x²+y²)+2xy][(x²+y²)-2xy]=(x²+2xy+y²)(x²-2xy+y²)=(x+y)²(x-y)²
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