Si uo = 1, alors u1 = 9/(6 - 1) = 9/5 = 1.8
Si u1 = 1.8, alors u2 = 9/(6 - 1.8) = 9/4.2 = 2.1428 = 15/7
Si u2 = 15/7, alors u3 = 9/(6 - 15/7) = 9/(27/7) = 63/27 = 7/3
Si u3 = 7/3, alors u4 = 9/(6 -7/3) = 9/(11/3) = 27/11
Je ne sais pas comment aller plus loin.