bonjour
a)
4 + 5/6 = 4/1 + 5/6 = (4 x 6)/6 + 5/6 = 24/6 + 5/6 = 29/6
29/6 = 4,833333.....
non décimal, la division de 29 par6 ne se termine pas
b)
-6/20 - 8/6 = -3/10 - 4/3 = (on simplifie)
-(3 x 3)/30 - (4 x 10)/30 =
-9/30 - 40/30 = -49/30
-49/30 = -1,633333.....
non décimal, la division ne se termine pas
c)
8/9 -40/12 = 8/9 - 10/3 = 8/9 - (10 x 3)/ (3 x 3)
= 8/9 - 30/9
= (8 - 30/9
= -22/9
non décimal
