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计算(x²+2xy+y²)(x²-xy+y²)²
人气:257 ℃ 时间:2019-09-17 02:02:43
解答
=(x+y)²(x-y)²
=[(x+y)(x-y)]²
=(x²-y²)²
=x^4-2x²y²+y^4
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