Is the written calculation method firm?

Generally speaking, the vertical pen calculation method is a method of writing formulas or calculating grass with a pen, and it is the most commonly used calculation method in mathematics.

Related calculation methods include mental calculation, oral calculation and so on.

In order to celebrate New Year's Day, each of the four students in the dormitory prepared a gift as an exchange. It is stipulated that if you don't bring your own gift, how many ways can you have?

Just use the number 4 to make up 5, and the number is equal to 940.

Goodbye, Cambridge. Where is Cambridge?

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Why do military commanders have to understand mathematics?