已知X-Y=3, XY=1,求(-2XY+2X+3Y)-(3XY+2Y-2X)-(X+4Y+XY)的值,要过程啊 啊啊啊
3个回答
(-2XY+2X+3Y)-(3XY+2Y-2X)-(X+4Y+XY)
=-2xy+2x+3y-3xy-2y+2x-x-4y-xy
=-6xy+3x-3y
=-6xy+3(x-y)
=-6+9
=3
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