Réponse :
bonjour,
A = -22 + ( 13 - 5 ) × ( -5 )
priorité aux calculs dans la parenthèse
= -22 + 8 × (-5)
priorité aux multiplications
= -22 + -40
on calcule
= -62
B = (-2) ×(-8) + 2 × (-20)÷4
priorité aux multiplications et aux divisions
= 16 + 2 × (-20)÷4
diviser un nombre revient à multiplier son inverse
= 16 + 2 × (-20) × 1/4
= 16 + (-40) × 1/4
priorité aux multiplications :
= 16 + (-40/4)
= 16 + (-10)
= 6
C = -28 + (5 - 2) × (-4)
priorité aux calculs dans la parenthèse
= -28 + 3 × (-4)
priorité aux multiplications
= -28 + (-12)
on calcule :
= - 40
D = 7 ×(-7) + 3 × (-25) + (-5)
= -49 + (-75) + (-5)
= -129
E = -3.2 ×(-6) + ( -2.3 - 7.7)
= 19.2 + (-10)
= 9.2
F = 150 ÷ ( -1.2 - 9 × 3.2)
= 150 ÷ ( -1.2 - 28.8 )
= 150 ÷ (-30)
= 150× (-1/30)
= -150/30
= -5
exo 2 :
7-3 = 4 4 - 5 = -1 -1 - 4.7 = -5.7 -5.7 - 5.9 = -11.6
5 - 1 - 9 = -5 -5 + 0.3 = -4.7 -4.7 - 1.2 = -5.9
3.1 - 2.8 = 0.3 0.3 - 1.5 = -1.2
-0.1 - 1.4 = -1.5
voila :)
