Starting directly from the conditions of the topic, using related concepts, properties, theorems, rules and formulas, after strict reasoning and calculation, the conclusion of the topic is drawn.

Second, the special case method

Including the selection of special values, special positions, special functions, special series, special graphs and so on. Choose the options that match the meaning of the question, and substitute or compare the options to determine the answer.

This method is called special value substitution test, and it is a frequently used method.

Third, the combination of numbers and shapes.

Drawing graphics or images can make the information provided by the problem more intuitive and reduce the difficulty of thinking, which is a powerful strategy to solve mathematical problems.

Fourth, valuation judgment

Some problems, which belong to the problem of comparing size or determining position, can avoid wasting time by estimating the value or position because of accurate calculation and strict derivation.

Verb (abbreviation of verb) exclusion method (substitution test method)

Make full use of the characteristics of single choice in multiple-choice questions, that is, there is only one correct choice of information, and eliminate it one by one through analysis, reasoning, calculation and judgment, and finally achieve the goal.

Six, you can also use the limit method, scale method and inquiry induction method.