Bonsoir !
A = rac.50 + 4rac.18 - 7rac.8
A = 5rac.2 + 36rac.2-14rac.2 = 21rac.2
B = rac.20-8rac.45+2rac.5
B = 2rac.5 - 24rac.5 + 2rac.5 = -20rac.5
C = rac.12 + rac.75 + 4rac.300
C = 2rac.3 + 5rac.3 + 40rac.3 = 47rac.3
D = 5rac.63 - rac.28 + rac.7
D = 15rac.7 - 2rac7 + 1rac7 = 14rac.7
Bonne soirée.