计算(x+2y)(x-2y)-(x+2y)-(x-2y)(2y-x)=?
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计算(x+2y)(x-2y)-(x+2y)-(x-2y)(2y-x)=?计算(x+2y)(x-2y)-(x+2y)-(x-2y)(2y-x)=?计算(x+2y)(x-2y)-(x+2y)-(x-2y)
计算(x+2y)(x-2y)-(x+2y)-(x-2y)(2y-x)=?
计算(x+2y)(x-2y)-(x+2y)-(x-2y)(2y-x)=?
计算(x+2y)(x-2y)-(x+2y)-(x-2y)(2y-x)=?
(x+2y)(x-2y)-(x+2y)-(x-2y)(2y-x)
=x^2-4y^2-x-2y+(x^2-4xy+4y^2)
=x^2-4y^2-x-2y+x^2-4xy+4y^2
=2x^2-x-2y-4xy
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