How to label the circulating decimals in turn?

Add a dot to the first and last numbers. According to the relevant information of the query cycle segment, add a dot to the first and last bit of the repeated decimal cycle segment. The representation method of loop segment only needs to write a loop segment, and add a dot to the first and last bit of this loop segment, for example, 0.45656… the loop segment is 56, that is, 0.45656…=0.456, and add a dot "."to "5 and 6".