Question

Tìm số nguyên n khi:

(-3)^n/ 81 = -27

 

Answer 1

\(\frac{\left(-3\right)^n}{81}=-27\)

\(\Rightarrow\left(-3\right)^n=-2187=\left(-3\right)^7\)

=> n = 7

Answer 2

\(\Rightarrow\left(-3\right)^n=\left(-27\right).81=-2187\)\(=\left(-3\right)^7\)

Vậy n=7

Answer 3

\(\frac{\left(-3\right)^n}{81}=-27\)

\(\Rightarrow\left(-3\right)^n=2187=\left(-3\right)^7\)

\(\Rightarrow n=7\)

chúc bn hok tốt !