Question

x⁷/81=27

Answer 1

x=3

Answer 2

\(\dfrac{x^7}{81}=27\\ \Leftrightarrow x^7=27\cdot81\\ \Leftrightarrow x^7=3^3\cdot3^4\\ \Leftrightarrow x^7=3^7\\ \Leftrightarrow x=3\)

Vậy \(x=3\)

Answer 3

\(\dfrac{x^7}{81}=27\Rightarrow x^7=27\cdot81=2187\Rightarrow x^7=3^7\Rightarrow x=3\)

Vậy x = 3