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What is the meaning of interval in high school mathematics? What is the specific usage?
Interval, in layman's terms, is the range.

For example, the interval of x is. At this time, the value of x is between 1 and 5, and both fractions and decimals are infinite.

If x is defined as an integer, the value of x can be 1, 2,3,4,5.

Parentheses include 1, 5. If it is a bracket, it does not include 1, 5.