XY(XY+3)+(XY+4)+4(X+Y+1)-(X+Y+2)
1个回答
XY(XY+3)+(XY+4)+4(X+Y+1)-(X+Y+2)
=x^2y^2+3xy+xy+4+4x+4y+4-x-y-2
=x^2y^2+4xy+3x+3y+6
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