你应该是问lim[x→∞] (x²-1)/(x-1)=lim[x→∞] (x+1)(x-1)/(x-1)=lim[x→∞] (x+1)=∞+1=∞或lim[x→∞] (x²-1)/(x-1)=lim[x→∞] (1-1/x²)/(1/x-1/x²)=(1-0)/(0-0)=1/0=∞∴极限不存在...