Aider moi pour le 1 et 2 merci

2/11-3/55 x (-5/6) = 2x5/11x5 -"/55 x (-5/6)
= 10/55-3/55 x(-5/6) = 7/55 x (-5/6) =- 35/330 = -7/66
35354 =2x11x1607
22498 = 2x7x1607  ⇒ PGCDE = 2 x 1607
35354/22498 = 11/7
(1/2 - 1/3)/7/24  -6 = (3/6-2/2/6) x 24/7  -6 = (1/6 x 24/7) -6 = 24/42 -6
24/42 - 6 = 4/7 - 6 = 4/7 - 42/7 = -38/7
 VTT
9/9 -5/9 =4/9
4/9/5 = 4/9x 1/5 = 4/45 ⇒ 135x4/45 = 12 €.