Réponse:
Bonjour j'espère que vous allez bien
a) 2(x-3)
= 2 × x - 2 × 3
= 2x - 6
B) 3x (2-x)
= 3x × 2 - 3x × x
= 6x - 3x²
c) (x+1) (x+5)
= x × x + x × 5 + 1 × x + 1 × 5
= x² + 5x + 1x + 5
= x² + 6x + 5
D) ( 2- 3x ) ( 3+x)
= 2× 3 + 2 × x + (-3x) × 3 + (-3x ) × x
= 6 + 2x - 9x - 3x²
= 6 - 7x 3x²
e) (x - 3) (5-2x)
= x × 5 + x × (-2x) + (-3) × 5 + (-3) × (-2x)
= 5x - 2x² -15 + 6x
= 11x - 2x² - 15
