a) -∞___-6_____-2__-1__0____2__3_________8___10________+∞
b) - 9 < numere intregi < 5
-∞______-8__-7__-6__-5__-4__-3__-2__-1__0_1__2__3__4___+∞
c) -∞____________-3____.____.___0___.____._____3__________+∞
| -3| = 3
| 3| = 3
d) -∞_____________-3____-2___-1___0___1____2____3___________+∞
un modul este un numar pozitiv
| -3| = 3 < 4
| -2| = 2 < 4
| -1| = 1 < 4
| 1| = 1 < 4
| 2| = 2 < 4
| 3| = 3 < 4
e) opusul unui numar este tot acelasi numar, dar cu semn schimbat
opusele numerelor întregi -5 -4 2 4
sunt : 5 4 -2 -4
-∞_________-4___.___-2___.___0___.____.____.____4____5____+∞
