Réponse:
A = ( -3,2) × (-10) × (+2) × (-0,5)
= 32 × (-1)
A = -32
B = ( -75) × (- 0,25 ) × (+4) × (+2)
= 18,75 × 8
B = 150
C = (-3) × ( -0,1) × (+5) × (+4)
= 0,3 × 20
C = 6
D = (-1,5) × ( +4) × (-1) × (+0,8) × (-3)
= 6 × (-2,4)
D = 14,4
E = (+2) × (-10) × (+3) × ( -1) × (-1)
= -60 × 1
E = -60
Explications étape par étape:
quelques règles:
♦ - × - = +
♦ - × + = -
♦ + × + = +
