Maths niveau 4e. Bonjour pouvez vous m'aider ? Merci

a. 4n + (3n+1) = 4n + 3n + 1 = 7n + 1

b. 17 - 2*(-5-x) = 17 - 2*(-5) - 2*(-x) = 17+10+2x = 27+2x

c. 13k - (2k+4)*10 = 13k - 10*2k - 10*4 = 13k - 20k - 40 = -7k - 40

d. 8m + 4 + (-2m - 5) = 8m + 4 - 2m - 5 = 6m - 1

e. (-2t + 1) - t = -2t + 1 - t = -3t + 1

f. 8(5x + 2) + 3 = 8*5x + 8*2 + 3 = 40x + 16 + 3 = 40x + 19