Bonjour
a.
7/- 15 = (7 x - 4) / (15 x 4) = - 28/60
7/3 = (7 x 20) / (3 x 20) = 140/60
490/420 = (70 x 7) / (70 x 6) = 7/6 = (7 x 10) / (6 x 10) = 70/60
- 5/12 = (- 5 x 4) / (12 x 4) = - 20/60
- 24/18 = (6 x - 4) / (6 x 3) = - 4/3 = (- 4 x 20) / (3 x 20) = - 80/160
2,5 = 25/10 = (25 x 6) / (10 x 6) = 150/60
Donc :
- 24/18 < 7/- 15 < - 5/12 < 490/420 < 7/3 < 2,5.
b.
- 29/100
- 7/25 = (- 7 x 4) / (25 x 4) = - 28/100
- 0,285 = (- 0,285 x 100) / (1 x 100) = - 28,5/100
- 1/5 = (- 1 x 20) / (5 x 20) = - 20/100
13/- 50 = (13 x - 2) / (50 x 2) = - 26/100
0
- 1/2,5 = (- 1 x 40) / (2,5 x 40) = - 40/100
Donc :
0 > - 1/5 > 13/- 50 > - 7/25 > - 0,285 > - 29/100 > - 1/2,5.
