Because the answer to multiple-choice questions is one of the four options, there must be only one correct answer, so we can use the exclusion method to exclude the answer that is easy to judge as wrong from the four options, so the remaining one is naturally the correct answer.

According to the conditions in the topic, select special values that meet the conditions or make special graphics for calculation and reasoning. When solving problems with special value method, we should pay attention to selecting values that meet the conditions and are easy to calculate. To solve multiple-choice questions related to graphics or images, we often use the thinking method of combining numbers with shapes, and sometimes we have to use other methods comprehensively.

Fill-in-the-blank questions, which belong to multiple-choice questions, have all the characteristics of objective questions, namely, the questions are short and lean, the examination objectives are focused, the answers are unique and correct, the answering methods are simple, and the scores are objective and fair.

However, it has its own characteristics, that is, there is no alternative answer to choose from, which avoids the hint or interference of options and the lucky psychology of candidates. From this perspective, we can really examine the real level of students.

Mathematical thinking method:

1, the combination of numbers and shapes: according to the internal relationship between the conditions and conclusions of mathematical problems, it not only analyzes its algebraic significance, but also reveals its geometric significance; Make the relationship between quantity and figure skillfully and harmoniously combined, and make full use of this combination to seek ideas and solve problems.

2. The idea of connection and transformation: Things are interrelated, restricted and transformed. All parts of mathematics are also interrelated and can be transformed into each other. When solving problems, if we can properly handle the mutual transformation between them, we can often turn the difficult into the easy and simplify the complicated.

3. The idea of classified discussion: in mathematics, it is often necessary to investigate under different circumstances according to the different nature of the research object; This classified thinking method is an important mathematical thinking method and an important problem-solving strategy.

4. Matching method: try to construct an algebraic expression into a plane, and then make the necessary changes. Matching method is an important deformation skill in junior high school algebra, which plays an important role in decomposing factors, solving equations and discussing quadratic functions.