Calculer les expressions sous forme de fraction simplifier si possible. ( calculer d'abord les multiplication avant les soustraction ou addition ) A=1/3 x -4/3

Bonsoir , 
A = -4/9 + 7/2
A = -8/18 + 63/18
A = 55/18
B = 7/3 + -30/42
B = 98/42 + -30/42
B = 68/42
B = 34/21
C = 6/5 - 3/36
C = 6/5 - 1/12
C = 72/60 - 5/60
C = 67/60
D = 3/2 + 15/20 - 4/3
D = 3/2 + 3/4 - 4/3
D = 18/12 + 9/12 - 16/12
D = 11/12

Bonsoir,

A=1/3 x -4/3 + 7/2
A = - 4/9 + 7/2
A = - 4 x 2 / 9 x 2 + 7 x 9 / 2 x 9
A = - 8/18 + 63/18
A = 55/18

B=7/3+3/2x(-10)/21
B = 7/3 - 30/42
B = 7 x 14 / 3 x 14 - 30/42
B = 98/42 - 30/42
B = 68/42
B = 2 x 34 / 2 x 21
B = 34/21

C=6/5-(-1)/9x(-3)/4
C = 6/5 + 1/9 x - 3/4
C = 6/5 - 3/36
C = 6 x 36 / 5 x 36 - 3 x 5 / 36 x 5
C = 216/180 - 15/180
C = 201/180
C = 3 x 67 / 3 x 60
C = 67/60

D=3/2+3/5x5/4 - 4/3
D = 3/2 + 15/20 - 4/3
D = 3 x 30 / 2 x 30 + 15 x 3 / 20 x 2 - 4 x 20 / 3 x 20
D = 90/60 + 45/60 - 80/60
D = 55/60
D = 5 x 11 / 5 x 12
D = 11/12