: Calcule chaque expression, en détaillant. A = [(+2) - (+5)] + [(−7) + (+4)] B = [(-3) + (+2)] − [(+8) − (+5)] C = [(+15)-(-8)] + [(−8) + (−3)] D = (+4) + [(-5

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.