bonjour
1 )
x
x - 2
( x - 2 ) ( x + 3 ) = x² + 3 x - 2 x - 6 = x² + x - 6
x² + x - 6 + 6 = x² + x
x² + x - x²
= x donc Elie a raison
- 6
- 6 - 2 = - 8
- 8 x - 3 = 24
24 + 6 = 30
30 - 36 = - 6
- 6
4/7
4/7 - 2 = 4/7 - 14/7 = - 10/7
- 10/7 x ( 4/7 + 3 ) = - 10/7 x ( 4/7 + 21/7) = - 10/7 x 25 /7 = - 250/49
- 250/49 + 6 = - 250/49 + 294/49 = 44/49
44/49 - 16/49
= 28/49
= 4/7
