Question

biết 8^n+1/2^2n=2^5. khi đó n bằng bao nhiêu? 

Answer 1

\(\frac{8^{n+1}}{2^{2n}}=2^5\Rightarrow\frac{\left(2^3\right)^{n+1}}{2^2^n}=2^5\Rightarrow\frac{2^{3n+3}}{2^{2n}}=2^5\Rightarrow2^{3n+3-2n}=2^5\Rightarrow3n+3-2n=5\)

=>n=2