Réponses

2014-01-10T13:32:10+01:00
C= 3x²-6x-9
Pour x=1/3
3*(1/3)
² 
3*1/9 = 3/9
6x = 
6*1/3 = -6/3 = -2
C = 3/9 -2-9
C = 3/9 -18/9 -81/9
C = -96/9
C = -32/3
D= ax-ba 
ax = 1/3 *-3
ax = 1/3*-3
ax = -1
ba = 6
D = -1-6
D = -7
E= a²+b²-x²
a
² = 9 = 81/9
b² = 4 = 36/9
x² = 1/9
E = 81/9 + 36/9 -1/9
E = 116/9