1) /////////////////////////////////////////////--------(1)-------------------(2,5)-------------- \\\\\\\\\\\\\\\\\\\\\\\\\\x∈(2,5;∞)2){x≥1,5{x≤3 //////////////////////////////////////////////////////---------[1,5]----------------------[3]--------------- \\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\x∈[1,5;3]3 /////////////////////////////////////////////////////------------(-2)---------------------(-1,5)----------------\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\x∈(-2;-1,5)4{5x<5⇒x<1{x<12\\\\\\\\\\\\\\---------(1)---------------------(12)-----------///////////////////////////////////////////x∈(-∞;1)5{x≤15{x≥6\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\--------[6]------------------[15]----------- /////////////////////////////////////////x∈[6;15]6{x>0{x≥-7 /////////////////////////////////////////////----------[-7]--------------------(0)---------------- \\\\\\\\\\\\\\\\\\x∈(0;∞)