Question

решить двойное неравенство

Answer 1

$left { {{ frac{1-x}{3} leq 1} atop {frac{1-x}{3} geq 0}} right.$
${ {{1-x leq 3} atop {1-x geq 0}} right.$
$left { {{x geq -2} atop {x leq 1}} right.$