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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