Bonsoir jai compris comment faudrait-il faire parce que le premier jai trouver 7/30 mais je sais si cela est juste

Bonsoir,

A = 1/5 x - 4/3 + 7/2

A = - 4/15 + 7/2

A = (- 4 x 2) / (15 x 2) + (7 x 15) / (2 x 15)

A = - 8/30 + 105/30

A = 97/30

B = 4/5 : (- 3/7) - 7/10

B = 4/5 x - 7/3 - 7/10

B = - 28/15 - 7/10

B = (- 28 x 2) / (15 x 2) - (7 x 3) / (10 x 3)

B = - 56/30 - 21/30

B = - 77/30

C = 13/7 + (- 8/7) : (- 4/5)

C = 13/7 - 8/7 x - 5/4

C = 13/7 + 40/28

C = (13 x 4) / (7 x 4) + 40/28

C = 52/28 + 40/28

C = 92/28

C = (4 x 23) / (4 x 7)

C = 23/7

D = 7/3 + 3/2 x - 10/21

D = 7/3 - 30/42

D = (7 x 14) / (3 x 14) - 30/42

D = 98/42 - 30/42

D = 68/42

D = (2 x 34) / (2 x 21)

D = 34/21

E = 5/8 + (- 3/4) : (- 9/16)

E = 5/8 - 3/4 x - 16/9

E = 5/8 + 48/54

E = 5/8 + (6 x 8) / (6 x 9)

E = 5/8 + 8/9

E = (5 x 9) / (8 x 9) + (8 x 8) / (9 x 8)

E = 45/72 + 64/72

E = 109/72

F = 6/5 - (- 1/9) x (- 3/4)

F = 6/5 - 3/36

F = 6/5 - (3 x 1) / (3 x 12)

F = 6/5 - 1/12

F = (6 x 12) / (5 x 12) - (1 x 5) / (12 x 5)

F = 72/60 - 5/60

F = 67/60