2/3x-2/x+y乘{x+y/3x-(x+y)}
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2/3x-2/x+y乘{x+y/3x-(x+y)}2/3x-2/x+y乘{x+y/3x-(x+y)}2/3x-2/x+y乘{x+y/3x-(x+y)}原式=[(2/3)x-2][1/(3x)-1]=2
2/3x-2/x+y乘{x+y/3x-(x+y)}
2/3x-2/x+y乘{x+y/3x-(x+y)}
2/3x-2/x+y乘{x+y/3x-(x+y)}
原式=[(2/3)x-2][1/(3x)-1]
=2/9-(2/3)x-2/(3x)+2
=20/9-(2/3)x-2/(3x).
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