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Meilleure réponse !
2014-09-21T20:43:00+02:00
a. 18/24 = 6 x 3 / 6 x 4 = 3/4

b.540/288 = 36 x 15 / 36 x 8 = 15/8

c.120/50 = 10 x 12 / 10 x 5 = 12/5

d. 630/924 = 2 x 315 / 2 x 347 = 315/347

e.45/63
= 9 x 5 / 9 x 7 = 5/7