计算:(x-2y)^2-2(x-2y)(x+2y)+(x+2y)^2=
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计算:(x-2y)^2-2(x-2y)(x+2y)+(x+2y)^2=计算:(x-2y)^2-2(x-2y)(x+2y)+(x+2y)^2=计算:(x-2y)^2-2(x-2y)(x+2y)+(x+2
计算:(x-2y)^2-2(x-2y)(x+2y)+(x+2y)^2=
计算:(x-2y)^2-2(x-2y)(x+2y)+(x+2y)^2=
计算:(x-2y)^2-2(x-2y)(x+2y)+(x+2y)^2=
(x-2y)^2-2(x-2y)(x+2y)+(x+2y)^2=
=(x-2y-x-2y)²
=16y²
16y²
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