3) в скобках основание
log(6) x = log(6) 2³+log(6) √25 - log(6) 3²
log(6) x = log(6) 8 +log(6) 5 - log(6) 9
log(6) x = log(6) 40/9
x = 40/9
2)
a = log(5) 2
b = log(5) 3
log(5) 72 = log(5) 3*3*2*2*2 = log(5) 3² + log(5) 2³ = 2*log(5) 3 + 3*log(5) 2 =
= 2*b + 3*a
1)
log(10) (∛b²/(10^5*a^6*c^5)) =
= log(10) ∛b² - log(10) 10^5 - log(10) (a^6*c^5) =
= 2/3*log(10) b - 5 - 6*log(10)a - 5*log(10) c