0}} \right. \\ \\ \left \{ {{log_3 x\geq5} \atop x>0}} \right. \\ \\ \left \{ {{log_3 x\geq log_3 243} \atop x>0}} \right.\\ \\ \left \{ {{x\geq243} \atop {x>0}} \right. " alt=" \left \{ {{log_3 x-5\geq0} \atop {x>0}} \right. \\ \\ \left \{ {{log_3 x\geq5} \atop x>0}} \right. \\ \\ \left \{ {{log_3 x\geq log_3 243} \atop x>0}} \right.\\ \\ \left \{ {{x\geq243} \atop {x>0}} \right. " align="absmiddle" class="latex-formula">
ответ: [243; +∞)