x-1分之3-x的2次方-1分之x+3=0两边同乘以x²-1，得3(x+1)-(x+3)=02x=0x=0经检验x=0是方程的根。
x-1分之3-x的2次方-1分之x+3=0两边同乘以x²-1，得3(x+1)-(x+3)=02x=0x=0
