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(x+y)(x-y)(x平方+y平方)怎么算 帮个忙
人气:239 ℃ 时间:2020-07-03 11:53:24
解答
(x+y)(x-y)(x²+y²)
=(x²-y²)(x²+y²)
=x四次方-y四次方
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