Bonjour pouvez m’aider pour mon exercice de math car je n’y arrive pas svp ce serait très gentil ( pouvez bien précisez svp) Merci d’avance Mathématique 4ème

Bonjour

a. a = - 1 ; b = 1/3 ; c = 2/5

A = a/b + c

A = - 1 : 1/3 + 2/5

A = - 1 x 3 + 2/5

A = - 3 + 2/5

A = (- 3 x 5) / (1 x 5) + 2/5

A = - 15/5 + 2/5

A = - 13/5

B = (a + b) / c

B = (- 1 + 1/3) / 2/5

B =  [(- 1 x 3) / (1 x 3) + 1/3] : 2/5

B = (- 3/3 + 1/3) : 2/5

B = - 2/3 : 2/5

B = - 2/3 x 5/2

B = - 10/6

B = (2 x - 5) / (2 x 3)

B = - 5/3

C = a / (b + c)

C = - 1 : (1/3 + 2/5)

C = - 1 : [(1 x 5) / (3 x 5) + (2 x 3) /(5 x 3)]

C = - 1 : (5/15 + 6/15)

C = - 1 : 11/15

C = - 1 x 15/11

C = - 15/11

b.

B = (a + b) / c

B = (1/2 - 5/4) : 3/4

B = [(1 x 2) / (2 x 2) - 5/4] : 3/4

B = (2/4 - 5/4) : 3/4

B = - 3/4 : 3/4

B = - 3/4 x 4/3

B = - 12/12

B = - 1

C = a / (b + c)

C = 1/2 : (- 5/4 + 3/4)

C = 1/2 : - 2/4

C = 1/2 x - 4/2

C = - 4/4

C = - 1.

Julia a raison.