Bonjour,
N'oublies pas la formule de politesse la prochaine fois ;)
Pour rappel :
-> + et + => +
-> + et - => -
-> - et - => +
Priorité de calculs : parenthèse; puissance, multiplications et divisions, addition et soustraction
Donc :
A = [(+2) - (+5)] + [(−7) + (+4)]
A= [2 - 5] + [−7 + 4]
A = - 3 + (-3)
A = -3 - 3
A = -6
B = [(-3) + (+2)] − [(+8) − (+5)]
B = [-3 + 2] − [+8 − 5]
B = -1 - (+ 3)
B = - 1 - 3
B = - 4
C = [(+15)-(-8)] + [(−8) + (−3)]
C = [15 + 8] + [−8 −3]
C = 23 + ( - 11)
C = 23 - 11
C = 12
D = (+4) + [(-5) + (-2)]-[(-7) - (-2)]
D = (+4) + [-5 -2] - [-7 +2 ]
D = 4 + (-7) - (-5)
D = 4 - 7 + 5
D = 2
E = (2-8)-(-3+4)
E = -6 - (+1)
E = -6 - 1
E = - 7
F = (-15)-(-8-3) + [6-(-8)]
F= (-15) - ( -11) + (6 +8)
F = -15 +11 + 14
F = 10
Bonne soirée.