Pouvez vous m'aider à l'exercice 54 en détaillant tous svp ! :)

Bonjour

A = 2 - (t-3) + 4(t-1)
A = 2 - t +3 + 4t - 4
A = 3t  +1

B =  5(t+1) - 2( t +2)
B = 5t +5 - 2t -4
B = 3t +1

C = t(t +2) - t ( t -1) +1
C = t² + 2t -( t² -t) +1
C = t² +2t - t² +t +1
c = 3t +1

D = 2/3 ( 3/2 t² +9/2t) - t² +1
D = 6/6t² + 18/6t -t² +1
D =t² + 3t - t² +1
D = 3t +1