Nếu \(\mathop {\lim }\limits_{} {\mkern 1mu} {u_n}...

Câu hỏi: Nếu \(\mathop {\lim }\limits_{} {\mkern 1mu} {u_n} = 9\) thì \(\mathop {\lim }\limits_{} {\mkern 1mu} \frac{{2018}}{{\sqrt {{u_n} + 7} }}\) bằng

A. 504,5

B. 126,125.

C. 2018

D. 224,2