28.
\(\lim\limits_{x\rightarrow5}\dfrac{\sqrt{x-1}-2}{x-5}=\lim\limits_{x\rightarrow2}\dfrac{x-5}{\left(x-5\right)\left(\sqrt{x-1}+2\right)}=\lim\limits_{x\rightarrow5}\dfrac{1}{\sqrt{x-1}+2}\)
\(=\dfrac{1}{\sqrt{5-1}+2}=\dfrac{1}{4}\)
Đúng 0
Bình luận (0)
