计算：(x-2y)^2-(x+2y)(2y-x)

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计算：(x-2y)^2-(x+2y)(2y-x)计算：(x-2y)^2-(x+2y)(2y-x)计算：(x-2y)^2-(x+2y)(2y-x)(x-2y)^2-(x+2y)(2y-x)=(x-2y)

计算：(x-2y)^2-(x+2y)(2y-x)
计算：(x-2y)^2-(x+2y)(2y-x)

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

一2X^2(2y一x)

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