desoler j ai oublier de mettre ça 56/42=.../... 20/50=.../... 2000/6000=.../... 100/125=.../...

56/42 = (14 x 4)/(14 x 3) = 4/3

20/50 = (2 x 10)/(5 x 10) = 2/5

2 000/6 000 = (2 000 x 1)/(2 000 x 3) = 1/3
(correction comme tu as précisé)
200/600 = (200 x 1)/(200 x 3) = 1/3

100/125 = (25 x 4)/(25 x 5) = 4/5

56/42 =  4/3
20/50 = 2/5
2 000/6 000= 2/6 = 1/3
100/125 = 4/5