1.铅垂渐近线y=x^3/(x^2-1)分母为0时,因为分子此时不为0所以x=1和x=-1是铅垂渐近线；2.斜渐近线k=lim(x->∞)y/x=lim(x->∞)x^3/x(x^2-1)=1b=lim(x->∞)[x^3/(x^2-1)-x]=lim(x->∞)[(x^3-x³＋x)/(x^2-1)]=lim(x->∞)[(x)/(x^2-1)]=0即斜渐近线为y=x
