aidez moi svp pour la question 2

bonsoir

a = - 15 - 3.2 ( - 8) + 10.5 : 2.5
a = - 15  + 25.6 + 4.2
a = 19

b = 19  - 12 ( - 4 + 4 x 2.1) 
b = 19 - 12 ( - 4 + 8.4)
b = 19 - 12 x 4.4
b = 19 - 52.8
b = - 33.8

2) - 19 : - 33.8 = quotient +