(x+y)的2次方(x-y)-(x+y)(x-y)的2次方 很急快点

如题所述

解

(x+y)² (x-y)-(x+y)(x-y)²
=(x+y)(x-y)[(x+y)-(x-y)]
=(x² -y² )*2y
=2x²y-2y³

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第1个回答  2012-11-30
(x+y)的2次方(x-y)-(x+y)(x-y)的2次方

=(x+y)(x-y)[(x+y)-(x-y)]
=(x+y)(x-y)(x+y-x+y)

=2y(x+y)(x-y)