Bonjour j'aurais besoin de votre aide pour résoudre mon problème de maths, et je suis en 4eme(exercice numéro 20)

Bonsoir,

a- 4n + (3n + 1) = 4n + 3n + 1 = 7n + 1
b- 17 - 2 x (- 5 - x ) = 17 + 10 + 2x = 2x + 27
c- 13k - (2k + 4) x 10 = 13k - (20k + 40) = 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 = 40x + 16 + 3 = 40x + 19

Bonsoir

♤a.

A = 4n+(3n+1)
A = 4n+3n+1
A = 7n+1

♤b.

B = 17-2x(-5-x)
B = 17 -2×(-5x)-2×(-x)
B = 17 +10x + 2x
B = 12x+17

♤c.

C = 13k-(2k+4)×10
C = 13-(2k×10+4×10)
C = 13k-(20k+40)
C = 13k -20k-40
C = -7k-40

♤d.

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

♤e.

E = (-2t+1)-t
E= -2t+1-t
E= -3t+1

♤f.

F = 8(5x+2)+3
F = 8×5x+8×2+3
F = 40x+16+3
D= 40x+19

Voilà ^^