3/(x²-1)-2/(x+1)=03/(x²-1)-2(x-1)/(x+1)(x-1)=03/(x²-1)-(2x-2)/(x²-1)=0(3-2x+2)/(x²-1)=0（-2x+5)/(x²-1)=0∴-2x+5=0x²-1≠0解得x=2.5
