Cho \(\lim {u_n} = L\). Chọn mệnh đề đúng:

$1.$    

$\dfrac{2}{3}.$

$ - 1.$

$ - \dfrac{1}{3}.$

$1.$

$ - \dfrac{1}{4}.$

$\dfrac{4}{5}.$

$ - \dfrac{3}{4}.$

\(\lim \left( {{u_n}.{v_n}} \right) = 0\)          

\(\lim \left( {{u_n}.{v_n}} \right) =  + \infty \)          

\(\lim \left( {{u_n}.{v_n}} \right) =  - \infty \)

\(\lim \left( {{u_n}.{v_n}} \right) = 1\)

$0.$     

$1.$    

$\dfrac{3}{5}.$         

$ + \infty .$

\({u_n} = \dfrac{n}{2}\)

\({u_n} = \dfrac{2}{n}\)

\({u_n} = n\)

\({u_n} = \sqrt n \)

\(\lim n =  + \infty \)    

\(\lim \sqrt n  =  + \infty \)      

\(\lim \sqrt[3]{n} =  + \infty \)

\(\lim \dfrac{1}{n} =  + \infty \)