| e) | Utilise la règle des signes succéssifs pour simplifier l'écriture, puis calcule |
| (+
19) + (– 12) = |
7 |
4
+ (+ 2) = |
6 |
| (–
12) + (+ 7) = |
–
5 |
4
– (+ 2) = |
2 |
| (+
5) – (– 9) = |
5
+ 9 = 14 |
4
+ (– 2) = |
2 |
| (–
20) + (– 15) = |
–
35 |
4
– (– 2) = |
4
+ 2 = 6 |
| (–
10) – (– 2) = |
–
10 + 2 = – 8 |
–
4 – (– 2) = |
–
4 + 2 = – 2 |
| (+
26) + (+ 17) = |
43 |
–
6 – (– 4) = |
–
6 + 4 = – 2 |
| (–
21) – (– 4) = |
–
21 + 4 = – 17 |
8
– (+ 21) = |
–
13 |
| (–
19) + (+ 15) = |
–
4 |
12
+ (– 20) = |
–
8 |
| (+
17) – (+ 7) = |
10 |
–
5 – (+ 9) = |
–
14 |
| (–
33) – (– 6) = |
–
33 + 6 = – 27 |
–
12 – (– 23) = |
–
12 + 23 = 11 |