Bonsoir j'ai besoin d'aide sur deux exercices svp : Exercice 1: Simplifier à l'aide des critères de divisibilité. a. 21/6 b.14/12 c.-48/-18 d.15/45 e. 16/24 Exe

Bonsoir,

Exercice 1 :

a) 21/6 = (3 x 7) / (3 x 2) = 7/2

b) 14/12 = (2 x 7) / (2 x 6) = 7/6

c) -48/-18 = 48/18 = (6 x 8) / (6 x 3) = 8/3

d) 15/45 = (1 x 15) / (3 x 15) = 1/3

e) 16/24 = (2 x 8) / (3 x 8) = 2/3

Exercice 2 :

a) 9/7 et 57/42

9/7 = (9x6)/(7x6) = 54/42

9/7 < 57/42

b) -16/3 et -23/4

-16/3 = (-16 x 4)/(3 x 4) = -64/12
-23/4 = (-23 x 3)/(4 x 3) = -69/12

-23/4 < -16/3

c) -5/8 et -19/24

-5/8 = (-5 x 3)/(8 x 3) = -15/24

-19/24 < -5/8

d) -7/5 et -3/2

-7/5 = (-7 x 2)/(5 x 2) = -14/10
-3/2 = (-3 x 5)/(2 x 5) = -15/10

-3/2 < -7/5

e) 7/15 et 5/12

7/15 = (7 x 4)/(15 x 4) = 28/60
5/12 = (5 x 5)/(12 x 5) = 25/60

7/15 > 5/12

f) 7/12 et 7/9

7/12 = (7 x 3)/(12 x 3) = 21/36
7/9 = (7 x 4)/(9 x 4) = 28/36

7/12 < 7/9