(2) Some formulas are given by classification, such as the summation formula of equal ratio series,

(3) The properties and theorems of monotonicity of exponential function and logarithmic function are classified.

(4) Some operations are classified, such as the solution set of a quadratic inequality with parameters.

(5) Classification II caused by parameter changes. Different values of these parameters will lead to different results.

(3) Classification caused by practical significance. This kind of problem is common in practical problems.

(6) Classification caused by graphic changes, such as quadrant, point, line and surface where the terminal edge of an angle is located.

In the research, we should also pay attention to optimizing problem-solving strategies, simplifying or even avoiding the discussion of conversion strategies such as reduction to absurdity, complement set, changing principal component method and combining numbers with shapes.

Hmm. I also moved these from the website of Steady Education. You can look at other curriculum reform information yourself, which is quite professional.