Exercice 1 :
1/
7÷4
2/
• 0,9
• 0,5
• 0,25
• 0,2
Exercice 2 :
A = 2/3 + 8/3 B = 9/4 - 5/4
A = 2 + 8/3 B = 9-5/4
A = 10/3 B = 4/4
C = 1 - 4/7 D = 6 + 1/7
C = 7/7 - 4/7 D = 6/1 + 1/7
C = 7-4/7 D = 6×7/1×7 + 1/7
C = 3/7 D = 42/7 + 1/7
D = 47+1/7 = 43/7
E = 3/4 - 3/8 F = 5/9 + 11/63
E = 3×2/4×2 - 3/8 F = 5×7/9×7 + 11/63
E = 6/8 - 3/8 F = 35/63 + 11/63
E = 6+3/8 F = 35 + 11/63
E = 9/8 F = 46/63
G = 2/3 + 3/5 H = 11 × 5/6
G = 2×5/3×5 + 3×3/5×3 H = 11/1 × 5/6
G = 10/15 + 9/15 H = 11×6/1×6 × 5/6
G = 10+9/15 H = 66/6 × 5/6
G = 19/15 H = 66×5/6×6
H = 11×5/6×11
H = 55/66
Exercice 3 :
J = 1 + 9×7
J = 1 + 63
J = 64
K = 3 + 7×8 + 2
K = 3 + 56 + 2
K = 61
L = 4 + 6×(10-3)
L = 4 + 6×7
L = 4 + 42
L = 46
Exercice 4 :
M = 2/7 + 3/7 × 4
M = 2/7 + 3/7 × 4/1
M = 2/7 + 3/7 × 4×1/1×7
M = 2/7 + 3/7 × 28/7
M = 2/7 + 3×28/7×7
M = 2/7 + 3×4/4×7
M = 2/7 + 12/28
M = 2×4/7×4 + 12/28
M = 8/28 + 12/28
M = 8+12/28
M = 20/28
N = 13/3 - 5 × 3/4
N = 13/3 - 5/1 × 3/4
N = 13/3 - 5×3/1×3 × 3/4
N = 13/3 - 15/3 × 3/4
N = 13-15/3 × 3/4
N = 2/3 × 3/4
N = 2×4/3×4 × 3×3/4×3
N = 8/12 × 9/12
N = 8×9/12×12
N = 72/144
P = 1 + 2 × 5/3
P = 3 × 5/3
P = 3/1 × 5/3
P = 3×3/3×1 × 5/3
P = 9/3 × 5/3
P = 9×5/3×3
P = 3×5/3×3
P = 15/9
Exercice 5 :
Karim a manger : 5/12
Kévin a manger ( le reste ) : 12/12 - 5/12
12-5/12
7/12
Kévin a mangé sept douzième de la boîte a chocolat.
( Comme je te l'ai dit j'ai pas réussi la 6 mais voilà le reste, j'espère que ça ta aider et que je fait d'erreur nul part ^^).
