Some multiple-choice questions are adapted from calculation questions, application questions, proof questions and judgment questions. This kind of problem can directly proceed from the conditions of the problem, use the known conditions, related formulas, axioms, theorems and rules, and draw the correct conclusion through accurate operation, rigorous reasoning and reasonable verification, so as to determine the method of choosing branches.
2. Screening method
The essence of solving multiple-choice questions in mathematics is to get rid of the false and keep the true, abandon the wrong answers that do not conform to the meaning of the questions, and find the correct conclusions that conform to the meaning of the questions. We can narrow the choice by screening out some conclusions that are easy to judge and irrelevant, and then get the correct answer from the remaining conclusions. If there is only one conclusion after screening out the problems, it is the option.
3. Special value method
Some multiple-choice questions are difficult to solve directly by conventional methods. It is often very simple to choose some special cases for analysis, or to choose some special values for calculation, or to change the general form into a special form with specific values instead of letter parameters, and then make a judgment.
4. Verification method
By observing, analyzing and judging the test questions, each selected branch is substituted into the stem one by one for verification, or a special value is appropriately selected for verification, or other verification means are adopted to judge whether the selected branch is right or wrong.
5. Mirror image method
In the process of answering multiple-choice questions, you can draw a sketch according to the meaning of the question, and then refer to the practice, shape, position and nature of the graphic, and synthesize the characteristics of the image to draw a conclusion.
6. Heuristic method
For questions with strong comprehensiveness and many choices, if you want to be clear, you can establish geometric models and algebraic structures according to the meaning of the questions, and then try and choose by mistake, and pay attention to the flexible use of the above methods.
First, multiple-choice questions (***85 points)
1, generally speaking, the first few questions will be relatively easy. You can put four options in the question to see which answer matches, or you can choose the elimination method, and the last one is the correct answer.
2. According to statistics: 17 multiple-choice questions, the number of times that any option of ABCD becomes the correct answer is 3-5 times. So, students:
(1) If you can't write the question, you must answer it completely. You can't write all the same answers, so you won't get any points.
(2) I can only write 1-2 questions, and the rest 15 questions have different answers, so I can get at least 20 points.
(3) If you can write more than three questions, see which option of ABCD appears less frequently in your answer, and then write the question that you don't know how to write, so you can get at least 30 points.
Because the number of times A becomes the correct answer is generally no more than 5 questions, now I have written 3 questions to choose A. From the perspective of probability, A appears at most 2 times, while D appears 3-5 times.
Ii. Fill in the blanks (* *16)
Generally, the answer to a question is 1, 2,3. If you can't write every question, write 1 or 2,3 for all four questions.
But the probability of writing 1 is higher than that of writing 2 or 3. If you have enough time, you can try to put 1, 2, 3 in a topic whose answer may be an integer.
Iii. Answering questions (49 points)
Don't give up the score of the solution if you don't understand it at all. The characteristic of the solution is to solve it layer by layer and finally get the answer. Steps to solve the problem. For example:
① Solution: According to the meaning of the question, you can get ~ ~ ~ in the question (write the known data).
② Formula ~ ~ ~ ~
③ Calculated ~ ~ ~
④ Answer: ~ ~ ~
For some topics, we can change the formula given in the topic and write down the steps we want. We're not doing it anyway. It's better to write more relevant content. If we meet the right formula, we may score. If you don't write in the blank, you will definitely have no score.
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