1/(x-1)-1/(x-2)= 1/(x-3 )- 1/(x-4) 1/(x-1)+ 1/(x-4) =1/(x-3 )+1/(x-2 )通分得
（2x-5)/(x^2-5x+4)=（2x-5)/(x^2-5x+6) 得2x-5=0 或(x^2-5x+4)＝(x^2-5x+6) 所以x=5/2^这是什么x平方