Bonjour
Calculer en détails :
1)
11/6 - (- 3/4 - 5/6)
= (11 x 2) / (6 x 2) - [(- 3 x 3) / (4 x 3) - (5 x 2) / (6 x 2)]
= 22/12 - (- 9/12 - 10/12)
= 22/12 - (- 19/12)
= 22/12 + 19/12
= 41/12
2)
(4/21 - 3/7) - (3/10 - 8/15)
= [4/21 - (3 x 3) / (7 x 3)] - [(3 x 3) / (10 x 3) - (8 x 2) / (15 x 2)]
= (4/21 - 9/21) - (9/30 - 16/30)
= - 5/21 - (- 7/30)
= - 5/21 + 7/30
= (5 x 10) / (21 x 10) + (7 x 7) / (30 x 7)
= 50/210 + 49/210
= 99/210
= (3 x 33) / (3 x 70)
= 33/70.