Question

(16) в степени х-1=216

Answer 1

1  способ
(1/6) ^ (x - 1) = 216
6^ (-x + 1) = 6^3
- x + 1 = 3
- x = 2
x = - 2 

2 способ
(1/6)^ (x - 1) = (1/6)^(-3)
x - 1 = - 3 
x = - 3 + 1
x = - 2