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Problem solving format
Mathematical problem solving is to make others understand, so there must be logic. Therefore, the problem-solving format is very important.

1, simplify first, then evaluate (that is, give an algebraic expression to tell you which value algebra is = respectively)

To write "Solution: Original Formula =. . . "

2. Factorization

To write "Solution: Original Formula =. . . "

3. Other issues

Also write "solution: known, process, operation basis, result, etc."