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What answers should be expressed by sets in high school mathematics?
Use sets and intervals: value range, definition range, solution set and value range. ...

The range of values can also be expressed by inequality, but it is still recommended to express it by setting interval.

Generally, the fill-in-the-blank questions in the college entrance examination are all set intervals.

In addition, compared with the interval, the recommended interval is simple and not easy to make mistakes.