Bonsoir, pouvez vous m'aider a 2 exercices svp c'est URGENT FICHE JOINTE Merci à ceux qui m'aident !!!

43)
a) (2x + 3) (2x + 5)
= 4x² + 10x + 6x + 15
= 4x² + 16x + 15

b) (1/2x + 1) (2x + 1/2)
= 2/2x² + 1/4x + 2x + 1/2
= 4/4x² + 1/4x + 8x + 2/4
= 4x² + x + 8x + 2
= 4x² + 9x + 2

44)
a) (3a + 5) (7 + a)
= 21a + 3a² + 35 + 5a
= 3a² + 26a + 35

b) (2,5t + 0,1) (4t + 10)
= 10t² + 25t + 0,4t + 1
= 10t² + 25,4t + 1

45)
a) 5y + 1) (1/5y + 2)
= 5/5y² + 10y + 1/5y + 2
= 5/5y² + 50/5y + 1/5y + 10/5
= 5y² + 5y + y + 10
= 5y² + 6y + 10

b) (1/3 + 2/5x) (5x + 3)
= 5/3x + 3/3 + 10/5x + 6/5x
= 25/15x + 15/15 + 30/15x + 18/15x
= 25x + 15 + 30x + 18x
= 73x + 15

46)
A = (7x - 3) (1 + 2x)
A = 7x + 14x² - 3 - 6x
A = 14x² + x - 3

47)
a) (y + 5) (y - 4)
= y² - 4y + 5y - 20
= y² + y - 20

b) (4 - 3x) (x + 2)
= 4x + 8 - 3x² - 6x
= - 3x² - 2x + 8

48)
a) (v - 8) (4v + 2)
= 4v² + 2v - 32v - 16
= 4v² - 30v - 16

b) (3x + 7) (2x - 5)
= 6x² - 15x + 14x - 35
= 6x² - x - 35

49)
a) (2 - 3a) (a + 5)
= 2a + 10 - 3a² - 15a
= - 3a² - 13a + 10

b) (4 + 5x) (2 - x)
= 8 - 4x + 10x - 5x²
= - 5x² + 6x + 8

50)
a) (1/2x - 1) (4x + 2)
= 4/2x² + 2/2x - 4x - 2
= 4/2x² + 2/2x - 8/2x - 4/2
= 4x² + 2x - 8x - 4
= 4x² - 6x - 4

b) (- 1/4x + 1/2) (x - 4)
= - 1/4x² + 4/4x + 1/2x - 4/2
= - 1/4x² + 4/4x + 2/4x - 8/4
= - x² + 4x + 2x - 8
= x² + 6x - 8