Calculs numériques Page 1 / 2
Calculs numériques
Exercice N° 1 : Calculer A, B et C (On n’utilisera pas la calculatrice)
1) A = 2 – 3 x 5 = B = (2 – 3) x 5 = C = 2 – (3 x 5) = 2) A = -5 x (-3) + 2 = B= -5 x (-3 + 2) = C = [-5 x (-3)] + 2 = 3) A = 5 x 4 – 3 x 10 = B = 2 x (10 – 4 + 6 x 3) = C = (-3) x (-4) x (-10) = 4) A = (-1) x (-2) x (-3) = B = -2 x (-3) x (-2) x 2 = C = (-3 + 4) x (-2) + 1 = 5) A = -3 x 2 + 5 x 4 = B = 2 x (-3) – 6 x (-2) = C = (-5 + 2) x (-4) =
6) A = 100 : 2 = B= -100 : 2 = C = -100 : (-2) =
7) A = 3 x 4 : 2 = B = (3 x 4) : 2 = C = 3 x (4 : 2) =
8) A = 10 : 0,5 = B = 10 x 0,5 = C = 10 x 2 =
9) A = 4 + 10 : 2 = B = 4 : 2 + 10 : 2 = C = (4 + 10) : 2 = 10) A = (10 - 2 x 3) : 2 = B = [(10 – 2) x 3] : 2 = C = (10 – 2) x (3 : 2) = 11) A = 2 x (3 + 10) – 1 = B = 2 x 3 + 10 – 1 = C = 2 x 3 + (10 – 1) = Exercice N°2 : Calculer A, B, C et D, donner le résultat sous forme irréductible.
12) A =
2 -5 4 1 3
1 + = B =
3 -1 3 4 2 +
− =
C = 3
4 5 -2
1 + = D = 10
2
- 5+ = 13) A =
3 x10 4 x3 5
2 = B = )
2 x(-3 5 x2
3 =
C = )
5 (-4 2 x x5
10 = D =
2 x1 3) (-2 x 5
- =
14) A = 3)
2 (-1 3x
2 + = B =
3 x 4 5 -2
1 =
C = )
3 (2 1 2
-3+ + = D =
3 x 1 2 2)
(-3+ =
15) A =
2 x 1 3 3
2 + = B = x4
2 -3
1 =
C = 3
-2 1 x 3
- = D = )
3 -2 (1 x 3
- =
16) A = )
2 (-1 x 4) 1 3 -2
(2 + = B =
4 x 3 2 1
- + =
C = )
2 - 1 (3 x 4) 1 3
(2+ = D =
2 - 1 3 4 x 1 3
2+ =
17) A = 3 1 2
3 -2 1
+
= B =
2 5 4 3 2+
= C =
4 -3 5
3 =
18) A =
5 - 2 3 4
4 5 3 -2+
= B =
3 - 1 5 -6
10 - 3 5 -4
= C =
2 5 3 1
1 -
+ =
Calculs numériques Page 2 / 2
Exercice N° 3 : Étoile magique Compléter l’étoile magique :
Sur chaque alignement, le produit des quatre nombres est le même.
-3
-2 -1
4 15 5
1
2
