Bonjour,

Calculer et donner le résultat sous la forme d'une fraction  irréductible ou d'un nombre entier.

3/11 + 8/11 = 11/11 = 1

7/4 - 5/28 = (7 x 7) / (4 x 7) - 5/28 = 49/28 - 5/28 = 44/28 = (2 x 22) / (2 x 1) = 22

5/7 x 8/3 = 40/21

22/6 - 5/6 + 1/6 = 18/6 = (6 x 3) / (6 x 1) = 3

4/7 + 13/21 = (4 x 3) / (7 x 3) + 13/21 = 12/21 + 13/21 = 25/21

42 x 8/48 = 336/48 = (48 x 7) / (48 x 1) = 7

3 - (4/5 - 1/6) = (3 x 30) / (1 x 30) - [(4 x 6) / (5 x 6) - (1 x 5) / (6 x 5)] = 30/30 - (24/30 - 5/30) = 30/30 - 19/30 = 11/30

9/12 x 32/49 x 7/24 = 2 016/14 112 = (2 016 x 1) / (2 016 x 7) = 1/7

(2/5 + 6/35) x 7/30 = [(2 x 7) / (5 x 7) + 6/35] x 7/30 = (14/35 + 6/35) x 7/30 = 20/35 x 7/30 = 140/1 050 = (70 x 2) / (70 x 15) = 2/15

3/5 + 1/5 x 7/9 = (3 x 9) / (5 x 9) + 7/45 = 21/45 + 7/45 = 28/45

12 x (5/8 - 1/4) = 12 x [5/8 - (1 x 2) / (4 x 2)] = 12 x (5/8 - 2/8) = 12 x 3/8 = 36/8 = (4 x 9) / (4 x 2) = 9/2.