Explications étape par étape:
a = 98 - (24 + 18 + 21) = 98 - 63 = 35
b = 35 + 20 + 5 = 60
c = 50 + 60 + 43 + 37 = 190
d = 190 - (98 + 57) = 35
e = 43 - (18 + 12) = 43 - 30 = 13
f = 35 - (5 + 13 + 9) = 8
g = 50 - (24 + 8) = 18
h = 57 - (18 + 20 + 12) = 7
