Réponse :
Explications étape par étape
Bjr,
N:
140/24 = 70/12 = 35/6
108/42 = 54/21 =18/7
30/36 = 15/18 =5/6
35/6 *18/7 = 630/42 = 315/21 = 105/7=15
5/6 + 15 = 5/6 + 90/6 =95/6
P:
-15/24 = -5/8
35/10 = 7/5
-5/8 + 7/5 = -25/40 + 56/40 = 31/40
(31/40)/(91/24 )= (31*24)/( 40*91) = 744/ 3640 = 372/1820 =
186/910 = 93/455
S:
(10/30 )/(8/28) = (10*28)/(30*8) = 280/240 = 140/120= 14/12 = 7/6
14/30 + 7/6 = 14/30 + 35/30 = 49/30
☺
