lim(x^2-1/x-1)=?(x趋近于无穷大)求极限···

lim(x^2-1/x-1)=?(x趋近于无穷大)求极限···
lim(x^2-1/x-1)=?(x趋近于无穷大)
求极限···

lim(x^2-1/x-1)=?(x趋近于无穷大)求极限···
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

无穷