Bonjour à tous qui peux m'aider svp ex math 5ème additioner deux nombres en écriture fractionnaire MERCI Beaucoup

Bonjour,

I = 9/11 - 4/121
I = (9 x 11) / (11 x 11) - 4/121
I = 99/121 - 4/121
I = 95/121

J = 10/24 + 21/36
J = (10 x 3) / (24 x 3) + (21 x 2) / (36 x 2)
J = 33/72 + 42/72
J = 75/72
J = (3 x 25) / (3 x 24)
J = 25/24

K = 9 - 15/2 - 3/2
K = (9 x 2) / (1 x 2) - 15/2 - 3/2
K = 18/2 - 13/2
K = 5/2

L = 1 - 5/8 + 3/8
L = (1 x 8) / (1 x 8) - 5/8 + 3/8
L = 8/8 - 5/8 + 3/8
L = 11/8 - 5/8
L = 3/8

M = 7/18 + 2/6 + 5/9
M = 7/18 + (2 x 3) / (6 x 3) + (5 x 2) / (9 x 2)
M = 7/18 + 6/18 + 10/18
M = 23/18

N = (1/10 + 1/30) - (1/5 - 1/15)
N = [(1 x 3) / (10 x 3) + 1/30] - [(1 x 3) / (5 x 3) - 1/15]
N = (3/30 + 3/30) - (3/15 - 1/15)
N = 6/30 - 2/15
N = 6/30 - (2 x 2) / (15 x 2)
N = 6/30 - 4/30
N = 2/30
N = (2 x 1) / (2 x 15)
N = 1/15

P = 11/7 + 7/49 + 6/21
P = 11/7 + (7 x 1) / (7 x 7) + (3 x 2) / (3 x 7)
P = 11/7 + 1/7 + 2/7
P = 14/7
P = (7 x 2) / (7 x 1)
P = 2

Q = 8/5 - (1/10 + 2/10)
Q = 8/5 - 3/10
Q = (8 x 2) / (5 x 2) - 3/10
Q = 16/10 - 3/10
Q = 13/10.