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Which is the most difficult thing for a high school math teacher to teach version A?
The function of compulsory education is abstract.

The plane geometry of compulsory two is to prepare for choosing conic curve in the future, which needs to be studied well.

Generally speaking, compulsory courses are not difficult, but I still find elective courses more difficult. ...

Because the last two big problems in mathematics, one function and one cone, are all big heads.