Svp j'ai besoin d'aide

3/24 + 2/6
= 3/24 + 2 x 4 / 6 x 4
= 3/24 + 8/24
= 11/24

8/7 - 4/49
= 8 x 7 / 7 x 7 - 4/49
= 56/49 - 4/49
= 52/49

35/- 8 x - 4/5
= - 35/8  x - 4/5
= 140/40
= 20 x 7 / 20 x 2
= 7/2

9 + 36/7
= 9 x 7 / 1 x 7 + 36/7
= 63/7 + 36/7
= 99/7

23/22 + 11/46
= 23 x 46 / 22 x 46 + 11 x 22 / 46 x 22
= 1058/1012 + 22/1012
= 1080/1012
= 4 x 270 / 4 x 253
= 270/253

- 3/24 : 5/6
= - 3/24 x 6/5
= - 18/120
= 6 x - 3 / 6 x 20
= - 3/20

35/- 8 x - 4/5 - Déjà fait

1 + 6/7
= 1 x 7 / 1 x 7 + 6/7
= 7/7 + 6/7
= 13/7

23/17 + - 51/46
= 23/17 - 51/46
= 23 x 46 / 17 x 46 - 51 x 17 / 46 x 17
= 1058/782 - 867/782
= 191/782