Réponses

2014-01-05T17:17:57+01:00
A) 30x100 / 7 x 100 = 30/7
b) 63*5 / 54 * 5 = 63/54 = 6*7 / 6*9 = 7/9
c) 15*11 / 15*13 = 11/13
d) 8*44 / 60 = 44/60= 11*4 / 15*4 = 11/15