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

已知x-y=6,xy=-2,
求3（xy+x-2y）-5(y-2x)+2(xy-x)的值.
=3xy+3x-6y-5y+10x+2xy-2x
=5xy+11x-11y
=5×(-2)+11×6
=-10+66
=56;
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