\(\frac{16}{2^n}=2\)=> \(2^n=16:2=8\)=> \(n=3\)
b) \(\frac{\left(-3\right)^n}{81}=-27\)=> \(\left(-3\right)^n=-27.81=-2187\)=> n=7
c) \(8^n.2^n=16^n\)
a) \(\frac{16}{2^n}=2\)
\(2^n=\frac{16}{2}=8\)
\(2^n=2^3\)
\(\Rightarrow n=3\)
b) \(\frac{\left(-3\right)^n}{81}=-27\)
\(\left(-3\right)^n=\left(-27\right).81=-2187\)
\(\left(-3\right)^n=\left(-3\right)^7\)
\(\Rightarrow n=7\)
c) Bạn viết thiếu đề nhé !
\(8^n.2^n=?\)