(x+2y)(x-2y)-(2x-y)的平方
(x+2y)(x-2y)-(2x-y)的平方
数学人气：768 ℃时间：2019-11-18 12:52:48
优质解答
x的四次方-16y的四次方-4x的二次方+y的二次方
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