Question

Решите систему уравнений:$left { {{ frac{x}{3} geq 0 } atop {1-3x leq 2x-1}} atop {3-x textless 0}$

Answer 1

$left { {{x geq 0} atop {-5x leq -2}} left \ x textgreater 3$
$left { {{x geq 0 } atop {x geq 0,4}} right. x textgreater 3$
Ответ:x∈(3;∞)