Question

log 0,3 (18-x) < log 0,3 (8-x)

Answer 1

$log_{0.3} (18-x) textless log_{0.3} (8-x)$
ОДЗ: $left { {{18-x textgreater 0} atop {8-x textgreater 0}} right. ; left { {{x textless 18} atop {x textless 8}} right. ;x textless 8$

$18-x textgreater 8-x$
$18-8 textgreater x-x$
$10 textgreater 0$

Ответ с учетом ОДЗ: (-∞;8)