3xy-4xy-(-2xy)

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3xy-4xy-(-2xy)3xy-4xy-(-2xy)3xy-4xy-(-2xy)提公因式xy,用结合律求3xy-4xy-(-2xy)=(3-4+2)xy=xy3xy-4xy-(-2xy)=3xy-

3xy-4xy-(-2xy)
3xy-4xy-(-2xy)

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

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