(3x+9y)(x-3y)能不能用平方差公式计算
人气：272 ℃ 时间：2019-12-23 02:59:48
解答
解
(3x+9y)(x-3y)
=3(x+3y)(x-3y)
=3(x²-9y²)
=3x²-27y²
可以
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