Question

Решите пожаалуйстаа....
$x=log _{3} 81$
$x=log_{3}8 + log_{3} frac{27}{8}$
$x=log _{2} 16$
$x=log _{2}5+log _{2} frac{8}{5}$

Answer 1

$x=log _{2} 16\ x=log _{2} 2^4\ x=4log _{2} 2\ x=4$

$x=log _{2}5+log _{2} frac{8}{5}\ x=log _{2}5+log _{2}{8}-log _{2}5\ x=log _{2}2^3\ x=3log _{2}2\ x=3$