Bonjour,
F=
1+1/14 = 14/14 +1/14 = 15/14
12/ (15/14) =
(12*14) /15 = 168/15 = 56/5
G=
1+1/3 = 3/3 + 1/3 = 4/3
1/3 -1 = 1/3 -3/3 = -2/3
(4/3)/ (-2/3) =
4/3 * -3/2 = -12/6 = -2
