a) 2,(5) = (25-2)/9 = 23/9
13,(7) = (137-13)/9 = 124/9
125,(8) = (1258-125)/9 = 1133/9
0,(29) = 29/99
4,(37) = (437-4)/99 = 433/99
125,(106) = (125106-125)/999 = 124981/999
29,(471) = (29471-29)/999 = 29442/999
b) 0,2(7) = (27-2)/90 = 25/90
4,6(5) = (465-46)/90 = 419/90
8,23(7) = (8237-823)/900 = 7414/900
16,14(35) = (161435-1614)/9900 = 159821/9900
200,79(125) = (20079125-20079)/99900 = 20059046/99900