simplifier les fraction 10/70; 13/7; 15/20; 9/15; 100/110 s.v.p

10/70 = 1/7 => simplification par 10
13/7 => impossible de simplifier
15/20 = 3/4 => simplification par 5
9/15 => impossible
100/110 = 10/11 => simplification par 10

10/70 = 10 x 1 / 10 x 7 = 1/7

13/7 = Irréductible

15/20 = 5 x 3 / 5 x 4 = 3/4

9/15 = 3 x 3 / 3 x 5 = 3/5

100/110 = 10 x 10 / 10 x 11 = 10/11