1. Exercice 14
5 5 24 + 5 29
(a) 4 − (−1) = 4 + = =
6 6 6 6
4 5 4×1×5
· (−1) · +3 =− +3
(b) 3 6 3·6
−20 −20 + 54 34 17
= +3= = =
18 18 18 9
12 4 3 × 2 × 12 × 4 2 × 12 × 4
(c) (−3)·2· · = = = 2×2×4 = 16
3 −6 3×6 6
2 9−2 7
(d) − 3 − =− =−
3 3 3
−3 − 2(−3) −3 + 6 3
(e) = = = −3
−1 −1 −1
4 4 −4 4
(f) − − · (−1) = + =0
3 3 3 3