已知x+y=5,xy=-1,则（3x-4y+2xy)-(2x-5y+5xy)=_______
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已知x+y=5,xy=-1,则（3x-4y+2xy)-(2x-5y+5xy)=_______已知x+y=5,xy=-1,则（3x-4y+2xy)-(2x-5y+5xy)=_______已知x+y=5,
已知x+y=5,xy=-1,则（3x-4y+2xy)-(2x-5y+5xy)=_______
已知x+y=5,xy=-1,则（3x-4y+2xy)-(2x-5y+5xy)=_______
已知x+y=5,xy=-1,则（3x-4y+2xy)-(2x-5y+5xy)=_______
(3x-4y+2xy)-(2x-5y+5xy)
=3x-4y+2xy-2x+5y-5xy
=x+y-3xy
=5-3*(-1)
=5+3
=8
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