解方程1/(x-1)(x-2)+1/(x-2)(x-3)-3/(x-1)(x-4)=1/x-4

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1/(x-1)(x-2)+1/(x-2)(x-3)-3/晌模(x-1)(x-4)=1/x-4
1/租郑(x-2)-1/宴型缓(x-1)+1/(x-3)-1/(x-2)+1/(x-1)-1/(x-4)=1/x-4
1/(x-3)=2/(x-4)
x-4=2(x-3)
x-4=2x-6
2x-x=6-4
x=2
经检验x=2是增根，方程无解。

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这整个过程非常的复杂。
但是我可以告诉你答案是
x = 3！！

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