设3x/(x²-1)=y,则方程变为:y+1/y=5/2
解得:y1=2 y2=1/2
即:3x/(x²-1)=2或者3x/(x²-1)=1/2
解得:x1=2 x2=-1/2 x3=3+√10 x4=3-√10