Question

log 1/2(7x-4)больше или равно-1

помогите

Answer 1

$log_{1/2}(7x-4)cup -1|7x-4>0, 7x>4, x>4/7\\log_{1/2}(7x-4)geq log_{1/2}2\\7x-4leq 2\\7xleq 6\\xleq 6/7\\xin (4/7;6/7]\\\\y=5e^x-3lnx\y`=5e^x-frac{3}{x}$