Изобразите на координатной прямой промежутки :
а)x≤-2; б)0

а)   \\\\\\\\\\\\\\\\\\\\\\\\\\      -------------------[-2]-----------------→[]- сплошной кружок в точке х=-2б)х > 0                            \\\\\\\\\\\\\\\\\\\\\\\\\\\\--------------------(0)-------------------------------→() пустой кружокx < 0\\\\\\\\\\\\\\\\\\\\\\\\\\\                            --------------------(0)-------------------------------→х  ≥0                            \\\\\\\\\\\\\\\\\\\\\\\\\\\\--------------------[0]-------------------------------→x ≤ 0\\\\\\\\\\\\\\\\\\\\\\\\\\\                            --------------------[0]-------------------------------→