girostolympe1 A = 8/3 +5 : (5/5 - 2/5)
=8/3+5 : 3/5
=40/15 + 75/15 : 9/15
=115/15 : 9/15
=7.66 : 0.6
=12.77

B=  55 x 1000 x 1024 /10000 x 512
= 56320000/ 5120000
= 11 
J'espère que ceci te convient. Bonne soirée a toi 

hugobastien A = 8/3 + 5/(1-2/5) = 8/3 + 5/(3/5) = 8/3 + 5 x 5/3 (multiplier par l'inverse) = 8/3 + 25/3 = 33/3 = (11x3)/3 = 11 B = (55 x 10^3 x 2^10)/(10^4 x 2^9) = (55 x 10^3 x 2^9 x 2)/(10^3 x 10 x 2^9) = (55 x 2)/10 = 110/10 = (11 x 10)/10 = 11 D'où A = B