(√6-2.5)(7-6x)(2√7-5)<0.
(2√6√7-5√6-2.5*2√7+2.5*5)(7-6x)<0
(2√42-5√6-5√7+7.5)(7-6x)<0 | разделим на (2√42-5√6-5√7+7.5)<0
7-6x>0
6x<7
x<7/6
(√6-2.5)(7-6x)(2√7-5)<0.
(2√6√7-5√6-2.5*2√7+2.5*5)(7-6x)<0
(2√42-5√6-5√7+7.5)(7-6x)<0 | разделим на (2√42-5√6-5√7+7.5)<0
7-6x>0
6x<7
x<7/6