A = 2 X ( 3/8 + 1/4) - 7/8 B = 3/5 +9/5 X 1/4 - 7/10 C = 3 + 7/3 X 9/2 D = 9/11 - 8/11 X 3/4 + 5/22 Help calculer en detaillant

A = 2 X ( 3/8 + 1/4) - 7/8
A = 2 x (3/8 + 1 x 2 / 4 x 2) - 7/8
A = 2 x (3/8 + 2/8) - 7/8
A = 2 x 5/8 - 7/8
A = 10/8 - 7/8
A = 3/8

B = 3/5 +9/5 X 1/4 - 7/10
B = 3/5 + 9/20 - 7/10
B = 3 x 4 / 5 x 4 + 9/20 - 7 x 2 / 10 x 2
B = 12/20 + 9/20 - 14/20
B = 21/20 - 14/20
B = 7/20

C = 3 + 7/3 X 9/2
C = 3 + 63/6
C = 3 x 6 / 1 x 6 + 63/6
C = 6/6 + 63/6
C = 69/6
C = 3 x 23 / 3 x 2
C = 23/2

D = 9/11 - 8/11 X 3/4 + 5/22
D = 9/11 - 24/44 + 5/22
D = 9 x 4 / 11 x 4 - 24/44 + 5 x 2 / 22 x 2
D = 36/44 - 24/44 + 10/44
D = 46/44 - 24/44
D = 22/44
D = 22 x 1 / 22 x 2
D = 1/2

A= 2(3/8 + 1/4) - 7/8
  = 2(3/8 + 2/8) - 7/8
  = 2(5/8) - 7/8
  = 5/4 - 7/8
  = 10/8 - 7/8
  = 3/8
B= 3/5 + 9/5(1/4) -7/10
  =3/5 + 9/20 - 7/10
  = 12/20 + 9/20 - 14/20
  = (12+9-14)/20
  = 7/20
C= 3 + 7/3(9/2)
  = 3 + 63/6
  = 18/6 + 63/6
  =81/6 = 27/2
D= 9/11 - 8/11(3/4) + 5/22
  = 9/11 - 24/44 + 5/22
  = 36/44 - 24/44 + 10/44
  = (36-24+10)/44
  = 22/44 = 1/2