Найдите сумму:
1. -4 +(-5) = -9;
2. 9 +(-11) = 2;
3. -10 + 4 = -14;
4. -6 +(-3) = 9;
5. -7 + 7 =0;
6. 13 +(-7) = -6;
7. 14 +(-15) = -1;
8. 13 +(-16) = 3;
9. 0 +(-3) = -3;
10. -11 + 17 = -6.
11. (+7)+(+5)
12. (+10)+(-8)
13. (-12)+(+8)
14. (-7)+(-3)
15. (-8)+(+8)
16. (+9)+0
17. 0+(-12)
Вставить пропущенное число:
1. -7 + * = -4;
2. -7 + * = -10;
3. 7 + * = 4;
4. * + 8 = -1;
5. * + (-8) = -17;
6. * + (-8) = 1.