(URGENT) ! Aider moi pour les ex 37 &38 merci davance

Exercice 37

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

A= 4/3 - 3/3

A= 1/3

B= 18/7 - (11/7 - 5/7)

B= 18/7 - 6/7

B= 12/7

C= 14/5 - 2/5 + 8/5

C= 12/5 + 8/5

C= 20/5

C= 4

D= 23/8 - 7/8 - 11/8

D= 16/8 - 11/8

D= 5/8

Exercice 38:

A= 5/18 - (5/36 - 1/36)

A= 5/18 - 4/36

A= 5x2/18x2 - 4/36

A= 10/36 - 4/36

A= 6/36

A= 1/6

B= 17/12 - (11/12 - 1/3)

B= 17/12 - (11/12 - 1x4/3x4)

B= 17/12 - (11/12 - 4/12)

B= 17/12 - 7/12

B= 10/12

B= 5/6

C= 11/6 - 2/3 + 1/6

C= 11/6 + 1/6 - 2/3

C= 12/6 - 2/3

C= 12/6 - 2x2/3x2

C= 12/6 - 4/6 C= 8/6

C= 4/3

D= 23/8 - 3/4 - 1/2

D= 23/8 - 3x2/4x2 - 1x4/2x4

D= 23/8 - 6/8 - 4/8

D= 17/8 - 4/8

D= 13/8