bonjour cher ami voilà la réponse de votre question
A = 3x -2y -1
1) x = 2 et y = -1
= 3 × (2) - 2 × ( -1) - 1
= 6 + 2 - 1
= 7
2) x = -3 et y = 0
= 3 × (-3) - 2 × (0) - 1
= -9 - 0 - 1
= - 10
3) x = -2/5 et y = -1/3
= 3 × (-2/5) - 2 × (-1/3) - 1
= -6/5 + 2/3 - 1
= -23/15
