Cho hai số \(a = {99^{20}}\) và \(b = {9999^{10}}\). Khẳng định nào sau đây là đúng

\(\begin{array}{l}
(A)\,\,{1^4}\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,(B)\,{1^6}\\
(C)\,{4^{10}}\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,(D)\,{4^6}
\end{array}\)

Hãy chọn đáp án đúng. 

\(\begin{array}{l}
(A)\,\,{4^{16}}\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,(B)\,\,{4^{10}}\\
(C)\,{16^{10}}\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,(D)\,{16^{16}}
\end{array}\)

Hãy chọn đáp án đúng. 

A) \({\rm{}}{2^{ - 2}}\)                   

B) \({2^2}\)                 

C) \({1^{ - 2}}\)

D) \({\rm{}}{2^8}\)   

A) \({10^{10}}\)                 

B) \({100^{ - 4}}\)           

C) \({10^{ - 4}}\)

D) \({\rm{}}{20^{ - 4}}\)

A) \(10 - 3\)           

B) \(\displaystyle {{10} \over 3}\)               

C) \(\displaystyle{1 \over {{{10}^3}}}\)

D) \({\rm{}}{10^3}\)