Multiple-choice questions on compulsory skills in junior high school mathematics
1. Pay attention to all the options in the multiple-choice question. Various methods can be used to solve problems in multiple-choice questions, such as direct method, special value method, exclusion method, verification method, graphic method, hypothesis method (that is, reduction to absurdity) and hands-on operation method (such as overlapping and overlapping, quantity and quantity).
2. Using exclusion method and substitution test method can save time. Some questions that judge the correct number of several propositions must be cautious. If you feel wrong, you'd better find counterexamples and pay attention to the application of classification thought; Be wary of the options with "or" and "and" in multiple-choice questions to see if you want to choose.
fill-in-the-blank question
1. Pay attention to the situation of multiple solutions to one question;
2. Pay attention to the implicit conditions of the topic, such as the quadratic coefficient is not 0, the integer in the actual problem, etc.
3. Pay attention to whether to bring units, and the expression format must be the final simplified result;
4. When you really can't find the angle and the length of the line segment, you can try to guess or measure.
answer the question
(1) Pay attention to the standard answer, and write the process and conclusion.
2 The calculation questions must be careful, and the final answer should be the simplest and absolutely correct.
(3) Simplify first and then evaluate, and then simplify to the simplest. When substituting for evaluation, it should be noted that the denominator is not zero; Give due consideration to technologies such as total replacement.
④ Solving fractional equations must be tested, as well as applying problems.
⑤ To solve the right triangle problem, pay attention to the method of making auxiliary lines and the steps of solving the problem. Pay attention to right angles and special angles. When you take an approximate value, you must follow the requirements of the topic.
⑥ Practical application questions, long questions, look at more questions, find the correct relationship, and list equations, inequalities (groups) or functional relationships according to the meaning of the questions. After finding the solution of the equation, we should pay attention to the root test, whether it conforms to the actual problem, and remember to choose.
⑦ Probability problem: List all possible results by drawing a tree diagram, listing or enumerating, and then calculate the probability.
⑧ Scheme design topic: Look at the design requirements of the topic clearly, and consider the simplest scheme that meets the requirements, not the complicated and beautiful scheme.
Matters needing attention in junior high school mathematics answering questions Mathematics pays more attention to the foundation, and the usual efforts can almost squeeze the role of skills to zero, but we should also pay attention to the following three points in the exam:
(1) It's easy before it's difficult. Don't memorize a question, but grasp the rhythm. Give up selectively. When you encounter something you can't do for the time being, put it aside and come back to do it when you finish other topics.
(2) calm down and check. After finishing the problem, leave 1 minute to check whether the problem is correct, and improve the accuracy while seeking the speed of doing the problem.
(3) Really not. Think about the definition. As mentioned earlier, mathematics is a basic subject, and most problems extend from the foundation. When you encounter problems that you can't do, return to the basics, list relevant theorems and formulas, and do necessary operations, as far as possible.