-1}} \right." alt="\sqrt{1-3x}<2\\\\\left \{ {{1-3x\geq 0} \atop {1-3x<2^{2} }} \right.\\\\\left \{ {{-3x\geq-1 } \atop {-3x<3}} \right.\\\\\left \{ {{x\leq\frac{1}{3}} \atop {x>-1}} \right." align="absmiddle" class="latex-formula">
Ответ : x ∈ (-1 , 1/3]