Réponses

2014-09-09T19:00:16+02:00
A = 4 x 15 x 14 / 21 x 10 x 22
= 60 x 14 / 210 x 22
= 840 / 4 620
= 2 / 11

B = 2^2 x 3 x 5^2 / 2 x 3^2 x 5^2
= 4 x 3 x 25 / 2 x 9 x 25
= 12 x 25 / 18 x 25
= 300 / 450
= 2 / 3