Răspuns :
3x≤9⇒x≤3⇔x=[0,1,2,3];
⇒A=[0,1,2,3];
x=[-5,5];
⇒B=[-5,5];
x=[-2,2,-1,1];
⇒C=[-2,2,-1,1];
⇒A=[0,1,2,3];
x=[-5,5];
⇒B=[-5,5];
x=[-2,2,-1,1];
⇒C=[-2,2,-1,1];