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(x+3y)(x-3y)(x的2次方-9y的2次方)
人气:141 ℃ 时间:2020-03-27 04:39:16
解答
(x+3y)(x-3y)(x²-9y²)
=(x²-9y²)(x²-9y²)
=(x²-9y²)²
=x^4-18x²y²+81y^4
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