Explicație pas cu pas:
a) 12[tex]\leq[/tex] x-3 [tex]\leq[/tex]27 /+3
15[tex]\leq[/tex] x [tex]\leq[/tex]30 ⇒x={15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30}
b)123[tex]\leq[/tex] x-100 [tex]\leq[/tex]149 /+100
223[tex]\leq[/tex] x [tex]\leq[/tex]249 ⇒x={223,224,225,226,227,228,229,230,231,232,233,234,235,236,237,238,239,240,241,242,243,244,245,246,247,248,249}
c)225[tex]\leq[/tex] x+100 [tex]\leq[/tex]237 /-100
125≤ x ≤137 ⇒{125,126,127,128,129,130,131,132,133,134,135,136,137}
d)4≤ 4+x ≤9 /-4
0[tex]\leq[/tex] x ≤5 ⇒x={0,1,2,3,4,5}
