作业帮已知x-y=3xy,则2x+3xy-2y除以x-2xy-y=?
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已知x-y=3xy,则2x+3xy-2y除以x-2xy-y=?
已知x-y=3xy,则2x+3xy-2y除以x-2xy-y=?
已知x-y=3xy,则2x+3xy-2y除以x-2xy-y=?
反复利用x-y=3xy
2x+3xy-2y除以x-2xy-y
=2（x-y）+3xy除以x-y-2xy
=9xy除以xy
=9
x-y=3xy,则2x+3xy-2y除以x-2xy-y=【3xy+2(x-y)】/【(x-y)-2xy】=【3xy+6xy】/【3xy-2xy】=9xy/xy=9
2X+3XY-2Y=2(X-Y)+3XY=2*3XY+3XY=9XY(因为X-Y=3XY)
X-2XY-Y=X-Y-2XY=3XY-2XY=XY
两式相除得9
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