There are two main methods to solve problems of straight lines and conic curves. The first method is to combine the straight line equation with the conic equation. Generally speaking, a linear equation with parameters needs to be established. Personally, I think it is better to set the straight line as metabolic rate: if it is known that the straight line passes through some points (such as the vertex and focus of a conic curve), it can be set as y-y0=k(x-x0) or y=kx+b, but there is no problem with the slope of the straight line, that is, x=x0, so as not to forget it. After the equations are established, it is necessary to use the known conditions to find out the relationship between parameters or known quantities. At this time, Vieta theorem is usually used for transformation, and don't forget to consider the discriminant.
The second method is the point difference method. In this method, the coordinates of two intersection points are first brought into the conic equation, and then the difference is made, so that the term of square subtraction or square addition will appear, which is convenient for transformation and simplification. Here, linear equations are mainly used in the process of simplification and transformation, so it seems that the parameters of most questions are in a straight line.
Generally, the calculation of this kind of problems is relatively large, and some tricks can be used to simplify the calculation. For example, problems involving focus can be transformed by the second definition of conic. Using the second definition, the distance between points can be transformed into the distance between points and straight lines, and in general, straight lines are perpendicular to the X axis or Y axis and are directly related to coordinates. This method is quite good when conic curve contains parameters. It is not widely used in answering questions, but it will be used in many small questions, so it is necessary to master the second definition.
Generally speaking, this kind of problem is more afraid of encountering the problem that the first problem is to find the trajectory equation (in fact, this kind of problem is quite common). This is to ensure that the trajectory equation is correct. The general trajectory equation will not be calculated by birth, so we need to use the first definition or the second definition of conic. Be sure to indicate the range of the curve after the solution is completed. Because according to the known conditions, it may only be a part of the curve, such as hyperbola.
For the problem of doing problems, I think it is enough to do some problems of the same type appropriately, mainly to realize the idea of solving problems. As for more questions, if you are still worried, just look and write some thoughts. You must do one or two things completely before the exam to ensure that you are not unfamiliar with the exam. Of course, there is no harm in doing more questions. Some small questions are still very flexible. Doing more helps to find ideas, as long as you don't get caught up in the sea of questions.
For the exam, it is mainly to have better skills. I studied knowledge, but in high school, the only way to learn is to take exams. Of course, when you encounter questions that you can't do in the exam, you should put them in the past and do them later. From my experience, it is really difficult to do this. We always don't want to give up, or we are struggling to give up. Time has passed in such hesitation, and there is no time to do the following questions. In my opinion, it is better to set yourself an online time for thinking questions. Generally speaking, a topic lasts more than 5 minutes without even thinking about it. Such a topic is difficult to do. For thoughtful questions, if you can't fully finish or fully understand them ten minutes after you start, don't do it, because it's hard to stick to it. Let nature take its course and not think about it. The problem lies with everyone. In addition, don't always stare at big problems. It's also important to make a fuss if you want to improve your grades. It is not easy to get 150 in the college entrance examination, because there must be some difficult questions in the big questions, which can generally account for nearly 20 points. In this way, it is cost-effective to find points from minor problems, and too many mistakes in a minor problem will lead to quick loss of points. You can find some papers that you didn't do well in the exam. You must get a lot of points on small questions. When all your plenary questions are answered, don't browse the previous fill-in-the-blank questions to ensure the correct rate of small questions, and then find more difficult solutions. Another way to improve your grades is to understand in your mind that those questions must be firmly grasped. For example, in the question of probability and statistics, this sub-question should have full marks. Solid geometry is mainly about accumulating experience. This subtitle can also do more questions to improve the score. Generally speaking, if you want to sprint in solid geometry fill-in-the-blank multiple-choice questions, you must ensure that at least two questions are correct. Pay attention to details in function questions, and choose the right method in sequence questions. For liberal arts students, there is usually a trigonometric function or vector big answer, and they must get full marks. Science students will have plural questions (usually minor ones), and they must not be wrong.
Dare to give up the exam, don't do the questions you can't do and don't regret it. Try to be right when you can, and you will get high marks. Do a full review before the exam, don't give yourself too much pressure, and don't lose heart if you don't do well in the exam. Usually, every exam is for college entrance examination training. If you find a mistake, you should correct it if it doesn't appear in the college entrance examination. I wish the landlord good grades in the exam.