| d) | Calcule les sommes suivantes. |
| (+
5) + (– 9) = |
– 4 |
(+
40) + (– 50) = |
–
10 |
(+
135) + (+ 123) = |
+
258 |
| (–
2) + (– 7) = |
–
9 |
(–
10) + (– 50) = |
–
60 |
(–
255) + (– 510) = |
–
765 |
| (–
7) + (+ 3) = |
–
4 |
(–
20) + (+ 50) = |
+
30 |
(+
516) + (– 221) = |
+
295 |
| (+
6) + (+ 4) = |
+
10 |
(+
30) + (+ 50) = |
+
80 |
(+
301) + (– 529) = |
–
228 |
| (–
1) + (+ 5) = |
+
4 |
(–
50) + (+ 60) = |
+
10 |
(–
185) + (+ 691) = |
+
506 |