3xy-4xy-(-2xy)

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3xy-4xy-(-2xy)

提公因式xy,用结合律求
3xy-4xy-(-2xy)
=(3-4+2)xy
=xy

3xy-4xy-(-2xy)
=3xy-4xy+2xy
=xy

3xy-4xy-(-2xy)
=-xy+2xy
=xy

如果帮到你,请记得采纳,O(∩_∩)O谢谢