XY除于X加Y等于3,则XY=3(X+Y)
2X-3XY+2Y的和除于-X+3XY-Y
=2X-9(X+Y)+2Y的和除于-X+9(X+Y)-Y
=-7(X+Y)÷8(X+Y)
=-7/8
已知XY除于X加Y等于3,求2X-3XY+2Y的和除于-X+3XY-Y的值
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