Question

Область визначення функції: f(x) = sqrt{log0,4x+1

Answer 1

$f(x)= sqrt{log_{0.4}x+1}$
$left { {{x>0} atop {log_{0.4}x+1 geq 0}} right. to left { {{x>0} atop {log_{0.4}0.4x geq log_{0.4}1}} right. to left { {{x>0} atop {0.4x leq 1}} right. to left { {{x>0} atop {x leq 2.5}} right.$

В-дь: $D(f)=(0;2.5]$

Answer 2

спасибо большое)