Bonjour,

14)

E = 6/11 + 4/11

E = 10/11

F = 8/9 - 13/9

F = - 5/9

G = - 3/10 + 7/10

G = 4/10

G = (2 x 2) / (2 x 5)

G = 2/5

H = - 1/12 - 7/12

H = - 8/12

H = (4 x - 2) / (4 x 3)

H = - 2/3

16)

M = 7/8 - 1/12

M = (7 x 3) / (8 x 3) - (1 x 2) / (12 x 2)

M = 21/24 - 2/24

M = 19/24

N = - 4/9 + 5/12

N = (- 4 x 4) / (9 x 4) + (5 x 3) / (12 x 3)

N = - 16/36 + 15/36

N = - 1/36

P = - 7/6 - 5/3 + 2/9

P = (- 7 x 3) / (6 x 3) - (5 x 6) / (3 x 6) + (2 x 2) / (9 x 2)

P = - 21/18 - 30/18 + 4/18

P = - 47/18

Q = (4/3 + 2/15) - (3/4 - 1/8)

Q = [(4 x 5) / (3 x 5) + 2/15] - [(3 x 2) / (4 x 2) - 1/8]

Q = (20/15 + 2/15) - (6/8 - 1/8)

Q = 22/15 - 5/8

Q = (22 x 8) / (15 x 8) - (5 x 15) / (8 x 15)

Q = 176/120 - 75/120

Q = 101/120.