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3 Decimals are divided into finite decimals and infinite decimals according to the names of the parts.

Cyclic decimal is a decimal infinite decimal that repeats the previous number or part from a number after the decimal point.

A simple symbol of cyclic decimal: click a point on the number 4 to start the first number in the cycle and the last number in the cycle 1.

If the decimal point of an infinite decimal point is followed by a number that starts from a certain number and ends in the right, it is called cyclic decimal, and this number is called cyclic segment.

The cyclic segment of a pure cyclic decimal begins with the first digit of the decimal part, which is called a pure cyclic decimal. Pure cyclic decimals are decimals derived from decimal cycles.

The cycle section of the mixed cycle decimal does not start from the first bit of the decimal part. This is called mixed cyclic decimal.