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](/uploads/image/z/581553-9-3.jpg?t=%E5%B7%B2%E7%9F%A5x%2By%3D-2%2Cxy%3D3%2C%E6%B1%822%EF%BC%88xy-3x%EF%BC%89-3%EF%BC%882y-xy%EF%BC%89%E7%9A%84%E5%80%BC)
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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