3xy-4xy-(-2xy) 快啊,亲

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3xy-4xy-(-2xy)快啊,亲3xy-4xy-(-2xy)快啊,亲3xy-4xy-(-2xy)快啊,亲xy=-xy+2xy=xyxy3xy-4xy+2xyXYxyxyXy=-1xy+1xy=0x

3xy-4xy-(-2xy) 快啊,亲
3xy-4xy-(-2xy) 快啊,亲

3xy-4xy-(-2xy) 快啊,亲

xy

=-xy+2xy=xy

xy

3xy-4xy+2xy

XY

xy

xy

Xy

=-1xy+1xy =0

xy

xy

xy

xy

xy