Log20 15+log20 3/5 + log20 5/4

Question

Log20 15+log20 3/5 + log20 5/4

Comments

Вычислите логарифмы

Answer 1

Log₂₀15+log₂₀(3/5)+log₂₀(5/4)=log₂₀(15*(3/5)*(5/4))=log₂₀((15*3*5)/(5*4))=
=log₂₀(45/4).