bonjour

programme 1

5

5 x 3 = 15

15 + 1 = 16

programme  2

5

5 - 1  = 4

5 + 2 = 7

4 x 7 = 28

A(x) = 3 x + 1

B (x) =  ( x - 1 ) ( x + 2 )

3 x + 1 = 0

3 x = - 1

x = - 1/3

il faut choisir  - 1/3