| b) | Calcule. |
| 7
– 4 + 5 = |
8 |
–7
– 3 – 5 – 2 = |
–
17 |
| –7
. (– 4) . 5 = |
140 |
–
3 + 5 + 6 – 3 – 1 = |
4 |
| –
4 + 5 + 6 – 7 = |
0 |
–
3 . 5 . 6 . (– 3) . (– 1) = |
–
270 |
| (–
4) . 5 . 6 . (– 7) = |
840 |
–
4 + 4 – 5 + 5 = |
0 |
| (–
7) . (– 3) . (– 5) . (– 2) = |
210 |
–
4 . 4 . 5 . (– 5) = |
400 |