0.13+0.23+0.33+0.43+0.53+0.63+0.73+0.83+0.93=

问题描述:

0.13+0.23+0.33+0.43+0.53+0.63+0.73+0.83+0.93=
13,23,33……93为循环节

13/99+23/99+33/99+43/99+53/99+63/99+73/99+83/99+93/99
=477/99
=53/11