Réponse :

M = 7/8 - 1/12

M = 21/24 - 2/24

M = 21-2/24

M = 19/24

N = -4/9 + 5/12

N = -16/36 + 15/36

N = -16+15/36

N = -1/36

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

P = -7/6 - 10/6 + 2/9

P = -7-10/6 + 2/9

P = -17/6 + 2/9

P = -102/36 + 8/36

P = -102+8/36

P = -94/36

P = -47/18

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

Q = (20/15 + 2/15) - (12/16 - 2/16)

Q = (20+2/15) - (12-2/16)

Q = 22/15 - 10/16

Q = 352/240 - 150/240

Q = 352-150/240

Q = 202/240

Q = 101/120