Mathematical question skills in college entrance examination
The last problem in 1. conic curve is often complicated and difficult to solve together. At this time, the special value method can be used to force calculation. The process is to merge first and then calculate delta. Use Vieta's theorem, list the expressions of the problem, and it's ok.
2. The space geometry of the required mathematics questions in the college entrance examination is a step in the proof process. I really can't think of directly writing unused conditions and then drawing unexpected conclusions. If the first question really can't be written directly, the second question can be used directly! Candidates who use conventional methods suggest that a spatial coordinate system should be established first. If you make a mistake, you can get at least a few points. This is an opportunistic skill, but it's like crossing a point!
3. There is a step in the process of proving space geometry that I really can't think of directly writing unused conditions and then drawing unexpected conclusions. If the first question really can't be written directly, the second question can be used directly! Students who use conventional methods suggest that a spatial coordinate system should be established at will first. If you make a mistake, you can get 2 points!
4. Use the letter formula to find the result and directly substitute it into the extreme value solution.
Example: the sum of the first n terms of arithmetic progression {an} is sn, and a 1 is greater than 0. If there is a natural number m≥3, let sm=am. When n is greater than m, the relationship between sn and an is as follows:
a、snand、sn≥an
Extreme value substitution:
Suppose m=3, n=4, a 1+a2+a3=s3=a3, then a 1+a2=0, that is to say, they are all reciprocal, a1>; 0, which is another special value, a 1= 1, then the tolerance is equal to-1, then this series is 1,-1, -3. ...
5, plane geometric length, with a ruler.
Some teachers are quite serious about writing their papers, and they are afraid that the geometry questions will be inaccurate. After computer calculation, they must use a ruler to measure the final test paper.
Yes, I think you already know: some college entrance examination questions of the same length can be measured directly with a ruler. Think about it, if the amount is 2.42cm, the result may be 2√2.
6. Fill in the blanks: be cautious and cautious. In mathematics subjective questions, fill-in-the-blank questions are not like the big questions behind, and need specific problem-solving steps. It only requires candidates to give a final answer. This requires candidates to be more careful in answering questions and solve problems step by step.
7. Big problem: the steps need to be clear. In the process of correcting big questions (calculation questions, proof questions), process scores and conclusion scores are generally given separately. Therefore, candidates should write down the steps clearly when answering questions, so that they can not only get the step marks, but also help their later investigation. Otherwise, it's like filling in the blanks. If the answer is wrong, there is no score.
High score skills in college entrance examination mathematics
1. If the answer has a root symbol, please do not select it.
I recommend: high school math problem-solving routines and skills.
2. If the answer is 1, please select.
3. When all three answers are yes, choose the right one.
4. When one is positive X and the other is negative X, choose one of them.
If the question looks simple, then the answer is complex, and vice versa.
6. If you choose the previous question and this question, it is not suitable to do this article if three identical ones appear in succession.
7. A good answer depends on your eyes.
8. when none of the above is practical, choose B.