Réponses

2012-12-03T18:14:56+01:00

Pour x = 0, A = 0

 

pour x = -1/3, tu as : 9(-1/3)² -5 (-1/3) +1

= 9*1/9+ 5/3+1

= 9/9 + 15/9 + 9/9 = 33/9

 

pour x = 2/3, tu as 9(2/3)² -5*2/3 +1

= 9*4/9 -10/3 +1

= 36/9 - 10/3 +1

=  36/9 - 30/9 +9/9 = 15/9