已知1/X+1/Y=6,则3X-2XY+3y/3XY+X+Y=多少
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已知1/X+1/Y=6,则3X-2XY+3y/3XY+X+Y=多少
![已知1/X+1/Y=6,则3X-2XY+3y/3XY+X+Y=多少](/uploads/image/z/15348690-18-0.jpg?t=%E5%B7%B2%E7%9F%A51%2FX%2B1%2FY%3D6%2C%E5%88%993X-2XY%2B3y%2F3XY%2BX%2BY%3D%E5%A4%9A%E5%B0%91)
1/X+1/Y=6
两边乘XY
Y+X=6XY
原式=[3(X+Y)-2XY]/[(X+Y)+3XY]
=[3(6XY)-2XY]/[(6XY)+3XY]
=16XY/9XY
=16/9
两边乘XY
Y+X=6XY
原式=[3(X+Y)-2XY]/[(X+Y)+3XY]
=[3(6XY)-2XY]/[(6XY)+3XY]
=16XY/9XY
=16/9
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