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Mathematically, 3m means what can be represented by the addition of three M's?
The addition of three m's is a combinatorial relationship, that is to say, 3 times m.

Specifically, from the perspective of mathematical algebra, 3m means 3× m, which is very clear when learning mathematics. We've calculated it. I can't confuse it. It may be 3+M above, but through the combination of two simple numbers and letters, it becomes a combination relationship. So we can say that the meaning of 3m in mathematical algebra is 3× m.