Question

Помогите,с математикой плохо!

Answer 1

$1) frac{log_3(512)}{log_3(8)} = frac{log_3(8^3)}{log_3(8)} = frac{3log_3(8)}{log_3(8)} =3 \ \ 2)log_{1,25}(7)*log_7(0,8)= frac{1}{log_7(1,25)} *log_7(0,8)= frac{log_7(0,8)}{log_7(1,25)}=log_{1,25}(0,8) \ =-1 \ \ 3) log_3(13)*log_{13}(9)=log_3(13)*log_{13}(3^2)=log_3(13)*2log_{13}(3)=1* \ 2=2$