Question

Tìm n , biết

6.2\(^n\)+ 3.2\(^n\)= 9.2\(^9\)

Answer 1

\(6\times2^n+3\times2^n=9\times2^9\)

\(2^n\times\left(6+3\right)=9\times2^9\)

\(2^n\times9=9\times2^9\)

\(n=9\)

Answer 2

ta có:\(2^n.\left(6+3\right)=9.2^9\)

\(2^n.9=2^9.9\)

\(\Rightarrow2^n=2^9\)

\(\Rightarrow n=9\) 

Vậy n=9