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b) logx =-3 ⇔ 10⁻³=x ⇒ x= 0,001
c)log o podstawie x z liczby 9= -2⇔ x⁻²= 9
(1/x)² =3²
1/x=3 ⇒ x=1/3
d)x=log 100 - log₂ 8= 2 - 3= -1
e) x= 25 do potęgi log₅2= 5 do potęgi 2log₅ 2= 5 do potęgi log₅2² = 5 do potęgi log₅ 4= 4
f) x= log 0,1 + log₂16= -1 +4= 3
x= log₃36 - log₃4= log₃(36 :4)= log₃ 9=2