Réponse :
bonjour
Explications étape par étape :
Ex 37:
A = (-7 + 5)×(-6) = -2 x -6= 12
B = 4×8-(-9) = 4 x 8 + 9 = 32 + 9 = 41
C = 4 × [8-(-9)] = 4 x ( 8 + 9 ) = 4 x 17 = 68
Ex 38:
A = 9-12÷3 = 9 - 4 = 5
B = (9-12)÷3 = - 3 ÷ 3 = -1
C = -36÷6-2 = 6 - 2 = 4
D = -36÷(6-2) = - 36 ÷ 4 = 9
Ex 39:
A = 15-6×(-8) = 15 - ( -48) = 15 + 48 = 63
B = -12+27÷(-3) = -12 + - 9 = -21
C = (-8+36)÷(-4) = 28 ÷ ( -4) = -7
D = 7×(12-18) = 7 x ( - 6 ) = - 42
Ex 40:
A = (-3)×2+6×(-4) = -6 + -24 = - 30
B = (-3)×(2+6)×(-4) = (-3) x 8 x ( -4) = (-24) x (-4) = 96
C = 4×[-6 + (-8)] - 10 = 4 x (- 14) - 10 = -56 - 10 = -66
D = -56÷(-7)+2×(-4) = 8 + -8 = 0
