计算(x+2y)(x-2y)-(x+2y)-(x-2y)(2y-x)=?

来源：学生作业帮编辑：神马作文网作业帮分类：数学作业时间：2024/11/18 20:05:51

(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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