Réponses

2013-04-24T18:43:26+02:00

= 4 - V7 + 4 + V7 + 2.V(4 - V7)( 4 + V7) = 8 + 2V(16-7) = 8 + 2V9 = 8 + 6 = 14

2013-04-24T18:45:12+02:00

il egale:

= 4 - V7 + 4 + V7 + 2.V(4 - V7)( 4 + V7)

= 8 + 2V(16-7)

= 8 + 2V9

= 8 + 6

= 14

voila :)