Bonsoir
A = 3 -4/7+1/2
A = 42/14 - 8/14 +7/14
A = 41/14
B = 5 : 1/4 +1/2
B = 5 : 1/4 + 2/4
B = 5 : 3/4
B = 5 x 4/3 = 20/3
C = 3 -4 x 2/7
C = 3 - 8/7
C = 21/7 - 8/7
C = 13/7
D : je lis mal un chiffre, me le confirmer
E = (3/4 -3/8)²
E = (6/8 -3/8)²
E = (3/8)² = 9/64
16 x 2^4 = 16 x 16 = 256
2^-3 x 2^5 : 2² = 2² : 2² = 2^0 = 1
2^4 x 3² : 9 x32
= 16 x 9 : 9 x 32
= 1/2
