RĂ©ponse :
Bonsoir,
Explications Ă©tape par Ă©tape
1) A = 1 - ( 2/3 + 1/4)
A = 1 - ( 8/12 + 3/12)
A = 1 - 11/12
A = 12/12 - 11/12
A = 1/12
B = 3-5/2 / 1+1/5
B = 6/2 - 5/2 / 5/5 + 1/5
B = 1/2 / 6/5
B = 1/2 x 5/6
B = 5/12
2) Les 4/5 de 35/8
C = 35/8 x 4/5
C = 7 x 5 x 4 / 4 x 2 x 5
C = 7/2
3) Somme A + B + C = 1/12 + 5/12 + 7/2
S = 1/12 + 5/12 + 42/12
S = 48/12
S = 6 x 8 / 6 x 2
S = 8/2
S = 4
