bonjour j'aurais besoin de votre aide merci

Salut Florine111,

2a)
B2 = 4 * 2 = 8
C2 = 12 * 2 = 24
D2 = 25 * 2 = 50
E2 = 49 * 2 = 98
F2 = 56 * 2 = 112

B3 = 4 * 3 = 12
C3 = 12 * 3 = 36
D3 = 25 * 3 = 75
E3 = 49 * 3 = 147
F3 = 56 * 3 = 168

B4 = 8 + 12 = 20
C4 = 24 + 36 = 60
D4 = 50 + 75 = 125
E4 = 98 + 147 = 245
F4 = 112 + 168 = 280

B5 = 20 : 10 = 2
C5 = 60 : 10 = 6
D5 = 125 : 10 = 12,5
E5 = 245 : 10 = 24,5
F5 = 280 :10 = 28

Formules:
B2 = B1 * 2
B3 = B1 * 3
B4 = B2 + B3
B5 = B4 : 10

Joyeux Noel!