svp m aider dm de maths pour demain

bonjour

a = 16 - 20 = - 4
b = - 13 - 17 + 30 + 25 = 55 - 30 = 25
c = 20 + 6.4 - 11 = 26.4 - 11 = 15.4
d = - 012 - 3.45 + 1.12 + 2.45 = 3.57 - 3 .57 = 0

E = - 3.5 + ( 4.8 - 8.9)
E = - 3.5  - 4.1 = - 7 .6

f = 7.4 - ( - 7.1 - 5.5) = 7.4 - ( - 12.6)
F = 7.4 + 12.6 = 20

g = - 27 + 4 x 12
G = - 27 + 48 = 21

H = (15- ( - 5))/4 =  (15 + 5) / 4 = 19/4

I = ( 9 + 2) x 15
I = 11 x 15 = 165

je te laisse le 4 pour ta contribution personnelle