bonjour j'ai vraiment besoin d'aide pour cette exercice je n'y arrive pas merci d'avance​

Bonjour

A = 5/6 + 1/2

A = 5/6 + (1 x 3)/(2 x 3)

A = 5/6 + 3/6

A = 8/6

B = 3/5 + 7/10

B = (3 x 2)/(5 x 2) + 7/10

B = 6/10 + 7/10

B = 13/10

C = 8/3 + 1

C = 8/3 + (1 x 3)/(1 x 3)

C = 8/3 + 3/3

C = 11/3

D = 4 + 3/4

D = (4 x 4)/4 + 3/4

D = 16/4 + 3/4

D = 19/4

E = 5/9 - 2/3

E = 5/9 - (2 x 3)/(3 x 3)

E = 5/9 - 6/9

E = (-1/9)

F = 7/6 - 13/30

F = (7 x 5)/(6 x 5) - 13/30

F = 35/30 - 13/30

F = 22/30

F = (2 x 11)/(2 x 15)

F = 11/15

G = 2 - 4/7

G = (2 x 7)/7 - 4/7

G = 14/7 - 4/7

G = 10/7

H = 8/9 - 5

H = 8/9 - (5 x 9)/9

H = 8/9 - 45/9

H = (-37/9)

exercice :

J = 5/2 + 8/3

J = (5 x 3)/(2 x 3) + (8 x 2)/(3 x 2)

J = 15/6 + 16/6

J = 31/6

K = 4/7 + 1/6

K = (4 x 6)/(7 x 6) + (1 x 7)/(6 x 7)

K = 24/42 + 7/42

K = 31/42

L = 7/4 + 3/5

L = (7 x 5)/(4 x 5) + (3 x 4)/(5 x 4)

L = 35/20 + 12/20

L = 47/20

M = 6/5 + 5/6

M = (6 x 6)/(5 x 6) + (5 x 5)/(6 x 5)

M = 36/30 + 25/30

M = 61/30

N = 2/3 - 1/4

N = (2 x 4)/(3 x 4) - (1 x 3)/(4 x 3)

N = 8/12 - 3/12

N = 5/12

P = 3/7 - 7/8

P = (3 x 8)/(7 x 8) - (7 x 7)/(8 x 7)

P = 24/56 - 49/56

P = (-25/56)

R = 8/9 - 1/2

R = (8 x 2)/(9 x 2) - (1 x 9)/(2 x 9)

R = 16/18 - 9/18

R = 7/18

S = 11/10 - 4/3

S = (11 x 3)/(10 x 3) - (4 x 10)/(3 x 10)

S = 33/30 - 40/30

S = (-7/30)