Sagot :

Bonsoir,

exercice 11

a=

1/10 + 14/10 = 15/10 = 3/2

b=

16/2 = 8

c=

20/16  = 10/8 = 5/4

d=

10/24 + 20/24 = 30/24 = 15/12 = 5/4

exercice 12

a=

3/39 +1/39 = 4/39

b=

3/39 -1/39 = 2/39

c=

3/51 +1/51 = 4/51