Combien vaut A = 3 - 15 + 23 ?
A = 3 - 15 + 23 = -12 + 23 = 23 - 12 = 11
A = 11
Combien vaut A = 26 - 9 - 17 ?
A = 26 - 9 - 17 = 17 - 17 = 0
A = 0
Combien vaut A = 23 - 41 - 20 ?
A = 23 - 41 - 20 = 23 - 61 = -\left(61 - 23\right) = -38
A = -38
Combien vaut A = 104 - 21 + 13 ?
A = 104 - 21 + 13 = 83 + 13 = 96
A = 96
Combien vaut A = 47 - 13 + 3 ?
A = 47 - 13 + 3 = 34 + 3 = 37
A = 37
Combien vaut A = 66 + 107 - 3 ?
A = 66 + 107 - 3 = 173 - 3 = 170
A = 170