2,3=23/10
0,15=15/100
3,107=3107/1000
0, (3)=3/9
0, (31)=31/99
1, (13)=113-1/99=112/99
2, (107)=2107-2/999 =2105/999
0,2 (3)=23-2/90=21/90
0,12 (3)=123-12/900=111/900
0,01 (72)=172-1/9900=171/9900
1,2 (108)=12108-12/9990=12096/9900
2,73 (5)=2735-273/900=2462/900
SPER CA TE-AM AJUTAT! !!!