已知x+y=-2,xy=3,求2（xy-3x）-3（2y-xy）的值

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已知x+y=-2,xy=3,求2（xy-3x）-3（2y-xy）的值
已知x+y=-2,xy=3,求2（xy-3x）-3（2y-xy）的值

已知x+y=-2,xy=3,求2（xy-3x）-3（2y-xy）的值
原式=2xy-6x-6y+3xy
=5xy-6(x+y)
=5×3-6×(-2)
=27

2（xy-3x）-3（2y-xy）
=2xy-6x-6y+3xy
=5xy-6(x+y)
=5×3－6×﹙－2﹚
=27

=5xy-6(x+y)=27

2（xy-3x）-3（2y-xy）=5xy-6(x+y)=27

2（xy-3x）-3（2y-xy）
=2xy-6x-6y+3xy
=5xy-6(x+y)
=5*3-6*(-2)
=27

原式为2（3-3x）-3（2y-3）=6-6x-6y+9=15-6(x+y)=15+12=27

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