2(1/x + 1/x-4)+2/x =1
4/x +2/x-4 =1
4x-16+2x=x^2-4x
x^2-10x+16=0
(x-8)(x-2)=0
x=8
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回應

2004-02-21 22:33
2(1/x + 1/x-4)+2/x =1
這OK
4/x +2/x-4 =1
這不對
應該是
6/x -8 =1
6/x=9
x=3/2 :-D