Răspuns:
5.7 = 57/10
8.5 = 85/10 = 17/2
0.007 = 7/1000
9,(5) = (95-9)/9 = 86/9
0,(6) = 6/9 = 2/3
8,(21) = (821-8)/99 = 813/99 = 271/33
4.2(3) = (423-42)/90 = 381/99 = 127/33
9.6(71) = (9671-96)/990 = 9575/990 = 1915/198
5.12(8) = (5128-512)/900 = 4616/900 = 1154/225