Bonjour ,
Réponse :
A = 3 x ( -6 ) - ( - 21 ) : 3 C = -8 x ( 6 + 3 ) : ( -10 )
= -18 - ( - 21 ) : 3 = -8 x 9 : ( -10 )
= -18 + 7 = -72 : ( -10 )
= -11 = 7,2
B = 50 - 27 : 3 + 6 D = 100 : ( -5 ) : ( - 4 ) - 3
= 50 - 9 + 6 = -20 : ( - 4 ) - 3
= 41 + 6 = 5 - 3
= 47 = 2
Bonne journée :)
