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What do you mean between 80 and 90?
We will score 80~90 points on this topic. How to express it with mathematical symbols?

We can say that the score is above 80 and below 90, then it can be said that it is above 80~89, and then it is better to say that it is above 80 and below 90 when doing this kind of topic, so it can be said that it is 80~90. To do this problem, we use the meter in the mathematical symbol to represent it.