Bonjour
a. 7/10 = (7 x 10) / (10 x 10) = 70/100
7/10 < 90/100
b. 10/4 = (10 x 5) / (4 x 5) = 50/20
10/5 = (10 x 4) / (5 x 4) = 40/20
10/4 > 10/5
c. 7/9 = (7 x 7) / (9 x 7) = 49/63
9/7 = (9 x 9) / (7 x 9) = 81/63
7/9 < 9/7
d. 2 = (2 x 17) / (1 x 17) = 34/17
2 < 35/17
e. 19/17 et 17/18
19 x 18 = 342
17 x 17 = 289
19/17> 17/18
f. 20 = (20 x 7) / (1 x 7) = 140/7
139/7 < 20.
