Lg2=a lg3=b найти lg1/15

Question

Lg2=a lg3=b найти lg1/15

Answer 1

Lg = -lg15 = -lg(3·5) = -lg3 - lg5 = -b - lg(3+2) = -b - lg( + )
lg2 = a ⇒  =2; lg3 = b ⇒  =3

Answer 2

Lg(1/15)=-lg3-lg5=-b-lg(10/2)=-b-1+lg(2)=a-b+1

Comments

Извините, a-b-1