1 summary of multiple-choice questions in college entrance examination: analysis of overall laws
The difficulty of an effective test paper should follow the law of 3: 5: 2. If you know this rule, can you use it when reviewing?
The difficulty distribution of college entrance examination questions is 30% simple questions, 50% medium questions and 20% difficult questions. This means that the basic questions account for 120 points, which is the main part of the exercises in the review, and must not be bored. You know, the college entrance examination is not only about your mastery of knowledge, but also about the speed of doing problems. Many students failed in the college entrance examination because they didn't have enough time and lost the moderately difficult questions they could usually do. These lessons are worth pondering.
In view of this, I suggest you spend more time on questions with moderate or low difficulty. Doing difficult problems is not as much as possible, just according to their own level: this is because most students feel headache when doing difficult problems and are prone to boredom; Second, it takes too much time to do difficult problems; Third, because most difficult problems are composed of moderately difficult ones, it will be relatively easy to do them after you have mastered the basic problems. ? The more complicated the problem, the more organic it is. This sentence is very reasonable. Most college entrance examination questions belong to this seemingly complicated type, and often give more conditions, which can usually be broken by careful analysis of the characteristics of conditions. The key to doing difficult problems lies in summing up at ordinary times. It is very useful to sum up some small experiences and conclusions and write them down by yourself, and your ability has also improved rapidly. Students who have spare capacity may wish to have a try.
2 Summary of the law of multiple-choice questions in mathematics in college entrance examination: specific laws
Rule 1, direct method
Directly from the conditions of the topic, apply related concepts, definitions, axioms, theorems, properties, formulas, etc. Use the correct method to solve the problem, get the correct conclusion through strict reasoning and accurate operation, and then compare it with the options given in the topic? Sit in the right position? And make corresponding choices. This method is called direct method. It is a basic, important and commonly used method, which generally involves the analysis of concepts and properties or the direct method is often used for simple operations.
Rule 2, Exclusion Method
Starting from the known conditions, by observing, analyzing or reasoning the information provided by each option, the wrong options are eliminated one by one, and the correct conclusion is drawn. This method is called exclusion. When there are multiple conditions, the exclusion method is usually used. First, according to some known conditions, find out the contradictory options and eliminate them. Then, according to other known conditions, find out the contradictory options among the remaining options and eliminate them until the correct option is obtained.
Law three, special case method
According to the specific conditions and characteristics of the topic and each option, the method of choosing a special value, a special set, a special point, a special figure or a special position state that meets the conditions instead of the general conditions of the topic, drawing a special conclusion and testing each option, so as to get a correct judgment is called the special case method. Commonly used special cases include special values, special sequences, special functions, special graphs, special angles, special positions and so on.
Rule 4. A combination of numbers and shapes
The combination of numbers and shapes is the combination of abstract mathematical language and intuitive graphics, that is, the organic combination of abstract thinking and image thinking. Use form to help numbers? Or? Solve the shape by number? Simplify complex problems and concretize abstract problems, thus optimizing the way to solve problems.
Law five, substitution method
Substitute each multiple-choice item into the question one by one to test, so as to get the correct judgment. That is to say, taking each branch as a condition to verify the proposition, the branch that can make the proposition hold is the answer to be chosen.