Réponse :
bonjour
exercice 3 :
A = 7/3 - 4/3 x 5/2
= 7/3 - 20/6
= 14/6 - 20/6 = - 6/6 = - 1
B = 2/3 - 1/2
= 4/6 - 3/6 = 1/6
C = 7/6 + 5/2
= 7/6 + 15/6 = 22 /6 = 11/3
A = 5 x 12 x 10 ⁻³ x 10 ⁴ sur 3 x 10 ⁵
= 60 x 10 sur 3 x 10 ⁵
= 20 x 10 ⁻⁴
= 2 x 10 ⁻³
B = 2.5 x 10 ⁻⁷ sur 5 x 10 ⁻⁶
= 0.5 x 10 ⁻¹
= 5 x 10 ⁻²
Explications étape par étape
