There should be different formats for doing different problems, such as solving equations and proving them by mathematical hardening. It is the same. When solving equations, the format is not very important, as long as you can express yourself. Mathematical induction, the format is very important, the basic format is right, and the topic is right.

I don't know much about it myself Take it as a reference. You'd better buy a foreign textbook.

Prove: Prove

Because ..., ......

Therefore, therefore. . . We can know. . . .

That is to say,

"Because, so" can be replaced by mathematical symbols.

When (x=? ) , ......(y=？ ) When (x=? )，(y=？ )