((x^2+2x)^½-(x-1)^½)/x的x趋于正无穷的极限

问题描述:

((x^2+2x)^½-(x-1)^½)/x的x趋于正无穷的极限

lim((x^2+2x)^½-(x-1)^½)/x (x→﹢∞)
=lim(x^2+2x)^½/x-lim(x-1)^½/x (x→﹢∞)
=lim(1+2/x)^½-lim(1/x-1/x^2)^½(x→﹢∞)
=1-0
=1