Question

log7(x-1) меньше либо равно log7 2+log 7 3

Answer 1

$log _{7} (x-1) leq log _{7} 2+log_{7}3 log_{7} (x-1) leq log x_{7} 2*3 log _{7} (x-1) leq log _{7}6 x-1 leq 6 x leq 6+1 x leq 7$