Bonjour
56/7 x - 44/4 = - 2 464/28 = (28 x - 88) / (28 x 1) = - 88
270/16 x 8/- 90 = - 2 160/1 440 = (720 x - 3) / (720 x 2) = - 3/2 = - 1,5
55/- 18 x - 72/5 x 2 = 3 960/90 x 2 = 7 920/90 = (90 x 88) / (90 x 1) = 88
- 60/34 x 17/- 20 = 1 020/680 = (340 x 3) / (340 x 2) = 3/2.