Question

Lg2=a lg3=b найти lg1/15

Answer 1

lg$frac{1}{15}$ = -lg15 = -lg(3·5) = -lg3 - lg5 = -b - lg(3+2) = -b - lg($10^{a}$ + $10^{b}$)
lg2 = a ⇒ $10^{a}$ =2; lg3 = b ⇒ $10^{b}$ =3

Answer 2

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

Answer 3

Извините, a-b-1