Bonjour, j'aurais besoins d'aide pour l'exercice 55 svp.

a = 1/5 ( 15x -10) +6 (5/3-3/2x)
a = 15/5x -10/5 + 30/3 -18/2x
a = 3x -2 +10 -9x
a = -6x +8

b = 2/3( 9t -4) -5 (3/5t -4/15)
b = 18/3t -8/3 +15/5t +20/15
b = 6t -8/3+ 3t +4/3
b = 9t -4/3

c = 1/4 (1/3x -5) -3/5 (7/2x -3/4)
c = 1/12x -5/4 -21/10x + 9/20
c = 5/60x - 126/60x - 25/20 +9/20
c = 121/60x -16/20
c = 121/60x - 4/5

d = 1/3x ( x+1) -4/9 (-3x-6)
d = 1/3x² +1/3x +12/9x + 24/9
d = 1/3x² +1/3x + 4/3x +8/3
d = 1/3x² +5/3x +8/3