Question

A={x€R||2×-1|<=11}
B={×€R||2×+1|>7}

Answer 1

Explicație pas cu pas:

|2x-1|<=11 => -11<=2x-1<=11 =>-10<=2x<=12 => -5<=x<=6 =>

x€[-5;6] => A=[-5;6]

|2x+1|>7 => 2x+1>7 sau 2x+1<-7 =>2x>6 sau 2x<-8 =>

x>3 say x<-4 => x€(-infinit;-4)U(3;+infinit)