(x+1)(y+1)(x-1)(y-1)化简.

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：2024/11/13 21:27:18

=[(x+1)(x-1)][(y+1)(y-1)]
=(x²-1)(y²-1)
=x²y²-x²-y²+1

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