Required 1: Lecture on Set and Function 1 Li Ning Set "1, Teacher Li teaches you how to easily solve the fractional inequality in set operation by" thread method "! 2. In order to help students better understand the meaning of "harmony", Miss Li divides "harmony" into three parts, so you can learn! 3. In this lecture, Mr. Li added some necessary knowledge for collective learning to make you stand out among the students! " 53 minutes required 1: lecture on set and function 2 The concept of Li Ning function "1, the thinking method of function runs through the high school mathematics curriculum, and this lecture will lead everyone to know and understand function together! 2, piecewise function is the basis of mathematical discussion, how to write piecewise function is correct, Teacher Li helps you understand! 3. Teacher Li teaches you the method of "combination of numbers and shapes" to help you quickly solve the multiple-choice questions in 1 minute! " 52-minute compulsory course 1: Set and Function Lecture 3: Properties of Li Ning Function (1) "1. Basic questions account for the vast majority in the exam, but many students lose points because the answers are not standardized. In this lecture, Mr. Li will explain the standard of answering some key questions to help students not lose points in the exam. 2. Do you know what to pay attention to when looking for the domain of the following function? What should I pay attention to when I get a score? How can we avoid making mistakes when looking for the domain of these important functions? Teacher Li Ning will give you detailed answers in this lecture. 3. In the usual exercises and exams, students are often required to draw auxiliary drawings, but do students know how to draw auxiliary drawings well, where to be meticulous and where to be free? " 39 minutes required 1: Set and Function Lecture 4: Properties of Li Ning Function (Part 2) "1. In the exam, the basic questions account for the vast majority, but many students lose points because the answers are not standardized. In this lecture, Mr. Li will explain the standard of answering some key questions to help students not lose points in the exam. 2. Do you know what to pay attention to when looking for the domain of the following function? What should I pay attention to when I get a score? How can we avoid making mistakes when looking for the domain of these important functions? Teacher Li Ning will give you detailed answers in this lecture. 3. In the usual exercises and exams, students are often required to draw auxiliary drawings, but do students know how to draw auxiliary drawings well, where to be meticulous and where to be free? " 47 Minutes Compulsory 1: Set and Function Lecture 5: Li Ning's Basic Elementary Function (Ⅰ) "1,which easily confuses the positive and negative values. In this lecture, Mr. Li will teach students to easily judge logarithmic values by using the formula of "same positive but different negative". 2. Understanding and mastering the image of function is the key to solve the problems in this chapter. In this lecture, Mr. Li will teach students to solve problems skillfully by combining numbers and shapes to help them answer questions quickly and well in the exam! 3. Do students know that the maximum and minimum values of a function are closely related to the nature of the function? Do students know the most error-prone place when judging the monotonous interval of logarithmic function? In this lecture, Teacher Li will answer you one by one! " The 54-minute requirement 1: Set and Function Lecture VI Li Ning's Basic Elementary Function (Ⅰ) (Ⅱ) "1. The positive and negative values are easily confused. In this lecture, Mr. Li will teach students to easily judge logarithmic values by using the formula of "same positive but different negative". 2. Understanding and mastering the image of function is the key to solve the problems in this chapter. In this lecture, Mr. Li will teach students to solve problems skillfully by combining numbers and shapes to help them answer questions quickly and well in the exam! 3. Do students know that the maximum and minimum values of a function are closely related to the nature of the function? Do students know the most error-prone place when judging the monotonous interval of logarithmic function? In this lecture, Teacher Li will answer you one by one! " 64 minutes required 1: set and function Lecture 7 Li Ning function and equation "1, how to understand that the existence theorem of function zero is a necessary and sufficient condition for the existence of function zero? Teacher Li told you to understand thoroughly! 2. Actually, "the root of equation" and "the zero of function" are different names of the same knowledge point. In this lecture, Mr. Li will teach you how to convert them reasonably in different occasions. 3. How to master the dichotomy and what is its connotation? Listen to Teacher Li and make sure you can use it flexibly after class! " 57-minute compulsory test 1: Lecture on Set and Function 8 "Li Ning Function Model and Its Application" 1, how to examine the function model and its application in the college entrance examination, Teacher Li will help you point out, so that you can be zero distance from the college entrance examination. 2. How to start with novel and flexible text questions? Teacher Li summarizes the trilogy for you, making it easy for you to do the problem! 3. In this lecture, Miss Li will teach you to look at images, so that you won't have trouble when you encounter image problems in the future! 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