1/(x-1)-1/(x-2)=1/(x-3)-1/(x-4)-1/(x-1)(x-2)=-1/(x-3)(x-4)因此X≠1、2、3、4(X-1)(X-2)=(X-3)(X-4)X^2-3X+2=X^2-7X+124X=10X=2.5
x=2.5