lim(x趋向于正无穷) (根号x^2+x -根号x^2+1)=lim(x趋向于正无穷) (根号x^2+x -根号x^2+1)(根号x^2+x +根号x^2+1)/(根号x^2+x +根号x^2+1)=lim(x趋向于正无穷) (x^2+x -(x^2+1))/(根号x^2+x +根号x^2+1)=lim(x趋向于...