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[(x-y)²+(x+y)²](x²-y²)计算
人气:405 ℃ 时间:2020-02-06 05:44:57
解答
原式=(x²-2xy+y²+x²+2xy+y²)(x²-y²)
=2(x²+y²)(x²-y²)
=2(x⁴-y⁴)
=2x⁴-2y⁴
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