Réponses

2014-09-13T18:03:55+02:00
3 / (4 * 2/3 + 2)
3 / (8/3 + 2)
3 / (8/3 + 6/3)
3 / (14/3)
= 3 * (3/14)
= 9/14

5/7 = 3 / (4x+2)

3 / (4x+2) = 5/7
21/(4x+2) = 5
5(4x+2) = 21
20x+10 = 21
20x = 11
x = 11/20