1r..........1s.................12l
1r...........x.................3000l
x=1*3000/12
x=250 s
1r.........250s..........3000l
6r...........y.............3000l
y=1*250/6
y=41, 6 s
3,(13)=3 13131313........
3,1(3)=3 13333333.......
3,13= 3 13000000.......
3,13(1)= 3 13111111......
3,131= 3 131000000.......
1)3,1(3)
2)3,(13)
3)3,13(1)
4)3,131
5)3,13