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log₁₂₁5√5 = log₁₂₁ 5 + log₁₂₁ √5 =
= log₁₂₁ 5 + 1/2*log₁₂₁ 5 =
= 3/2*log₁₂₁5 =
stosuje wzór na zmiane podstawy logarytmowania
log₁₂₁ 5 = (log₅ 5) : ( log₅121)
= 3/2* (log₅ 5) : ( log₅121)=
= 3/2*(1) : ( log₅11²)=
= 3/2 : 2 log₅11=
= 3/4 : log₅11=
w miejsce log₅11= a wstawiam a
= 3/(4a) c.n.u ( co należało udowodnić)