Réponse :
Explications étape par étape
Bsr,
5/3 * 12/7 = 60/21 = 20/7
18*7/27 = 126/27 = 42/9= 14/3
2/3 +20/7 - 14/3 = 20/7 - 12/3 = 20/7 -4=
20/7 - 28/7 = -8/7
1+2/7 -3/2 = 14/14 +4/14 - 21/14 = 7/14 = 1/7
2/3 +1/21 = 14/21 +1/21 = 15/21 = 5/7
(1/7)/(5/7) = (1*7)/ ( 7*5) = 7/35 = 1/7
L= 1/7
☺
