(1) Simplifying algebraic expressions: 4 - (-1) = 5, 4/6 + 5/6 = 9/3 = 3, (-1) * 5 + 3 = -5 + 3 = -2. (2) Solving equations: -20 + 54 = 34, 34/18 = 17/9. (3) Evaluating expressions: 3 * 2 * 12 * 4 / (3 * 6) = 2 * 12 * 4 / 6 = 16. (4) Performing operations: -3 - 2(-3) - 3 + 6 = -3. (5) Simplifying rational expressions: -4/3 + 4/3 * (-

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