Teacher Li is a senior high school math gatekeeper who retired from provincial key high schools and has rich teaching experience. Aiming at the key middle schools and universities in junior and senior high schools, we have made outstanding achievements in teaching students in accordance with their aptitude, developing their thinking and improving their knowledge and ability. Under his guidance, many students entered national key universities such as Peking University, Tsinghua, People's Congress and Beijing Normal University.
The competition of college entrance examination is the competition of candidates' strength, time and mathematical methods and skills. In more than 30 years of teaching practice, Miss Li has accumulated and summarized unique teaching experience formulas and methods.
Questions 18 in Guangdong college entrance examination in 2006 and 19 in Guangdong college entrance examination in 2007, like questions 18 in science, were "symmetrical" questions for two consecutive years. If we use his empirical formula, we can greatly simplify the calculation process and save at least half the time to complete the solution. Or the distribution of the function roots of 20 questions in Guangdong college entrance examination mathematics volume 2 1 science in 2007. If we use the thinking method of combining numbers and shapes to solve problems, our thinking will be more concise and more effective.
In 2008, the last question in the mathematics volume of Guangdong college entrance examination, science, tested the problem of "initial condition"+"recursive equation" to find the sum of the general term of the series and the first n terms of the series. If the problem is equivalently transformed into a "characteristic equation" for solving a "recursive equation", that is, the problem of finding the root of a quadratic equation in junior high school, more than half of the time can be saved. If we use his empirical formula about the diameter of parabolic yoke, we can quickly get the trajectory equation of the middle point M of the line segment PQ, which can save more than half of the answering time.
Practice has proved that the competition of mathematical methods and skills is the key to the time competition of college entrance examination, and it will also reduce the bottom line of error in answering questions to zero and improve the accuracy of answering questions to 100%, because the skills are wonderful and the methods are simple!
Just when the college entrance examination was admitted to Beijing Normal University Hong Kong Branch in 2009, a girl from Zhixin Middle School, who had been tutoring mathematics by Teacher Li after class, said, "Thank you, Miss Li, my college entrance examination has my share of credit." For example, in 2009, when the college entrance examination was admitted to China Normal University, a boy in No.2 Middle School who had been coached by Mr. Li after class said, "Thank you for teaching me this year. Mathematics is the penultimate question in the college entrance examination this year (14). I just solved it with the knowledge of parabolic yoke diameter you taught me. Too simple! "