Question

2. Tìm số nguyên n biết :

a) \(\frac{1}{9}\) . 27ⁿ = 3ⁿ

b) 3^-2 . 3⁴ . 3ⁿ = 3⁷

c) 2^-1 . 2ⁿ + 4 . 2ⁿ = 9 . 2⁵

d) 32^-n . 16ⁿ = 2048

Answer 1

a)

\(\Rightarrow3^{-2}.\left(3^3\right)^n=3^n\)

\(\Rightarrow3^{-2}.3^{3n}=3^n\)

\(\Rightarrow3^{3n-2}=3^n\)

\(\Rightarrow3n-2=n\)

\(\Rightarrow n=1\)

b)

\(\Rightarrow3^{4+n-2}=3^7\)

\(\Rightarrow x^{n+2}=3^7\)

\(\Rightarrow n+2=7\)

\(\Rightarrow n=5\)

c)

\(\Rightarrow2^n\left(\frac{1}{2}+4\right)=9.2^5\)

\(\Rightarrow2^n.4,5=9.2^5\)

\(\Rightarrow2^n=2.2^5\)

\(\Rightarrow2^n=2^6\)

\(\Rightarrow n=6\)

d)

\(\Rightarrow\left(2^5\right)^{-n}.\left(2^4\right)^n=2048\)

\(\Rightarrow2^{n-5n}=2^{11}\)

\(\Rightarrow-4n=11\)

\(\Rightarrow n=-\frac{4}{11}\)