Question

Срочно!!!!!
log(2)x-2log(1/2)x=9

Answer 1

ОДЗ : x > 0

$log_{2}x-2log_{\frac{1}{2}}x=9\\\\log_{2}x-2log_{2}x^{-1}=9\\\\log_{2}x+2log_{2}x=9\\\\3log_{2}x=9\\\\log_{2}x=3\\\\x=2^{3}=8$

Ответ : 8