Bonsoir
A = 11/3 - 8/3 + (-16/5)
A = 3/3 -16/5
A = 15/15 -16/15 = -1/15
B = (14/14 - 21/14 + 18/14) : (15/12 - 4/12)
B = 11/14 : 11/12
B = 11/14 x 12/11
B = 1/7 x 6 = 6/7
C = 2 x 10^3 x 5 x (10^-5)² sur 2 +18
C = 10 x 10^3 x 10^-10 sur 20
C = 0.5 x 10^-7
D = 7 x 10^-3 sur 63 x 10^-5
D =0.11 x 10^²
