What are the knowledge points of adult college entrance examination mathematics? 1: intersection, union and complement.
1, intersection: the intersection of set A and set B is A∩B, and the common elements of sets A and B are taken.
2. union: the union of set a and set b is marked as A∪B, and all elements of set a and set b are taken.
3. Complement set: given the complete set U, record the complement set of set A as CuA, and take all elements in U that do not belong to A..
Analysis: the intersection or union of sets mainly appears in the form of enumeration or inequality. Knowledge point 2: simple logic.
Concept: In a mathematical proposition, it is often composed of condition A and conclusion B, which is written as "If A holds, then B holds". If it is a true proposition, then A can deduce B and record it as "A B"; If it is a false proposition, then A can't deduce B, and it is recorded as "A B".
Question type: What are the conditions for judging whether Proposition A is Proposition B, starting from two aspects:
① Sufficient conditions to see whether A can deduce B ② Necessary conditions to see whether B can deduce A..
A, if A is B, then A is the necessary and sufficient condition of B, if A is B, then A is the necessary and sufficient condition of B, and if A is B, then A is the necessary and sufficient condition of B..
D, if A is B, then A is neither a sufficient condition nor a necessary condition for B.
Knowledge point 2: the essence of inequality
1. Add or subtract a number on both sides of the inequality, and the direction of the inequality remains unchanged. 2. Both sides of the inequality are multiplied or divided by a positive number, and the direction of the inequality remains unchanged. 3. if both sides of the inequality are multiplied or divided by a negative number, the direction of the inequality will change (">" change ")
Analysis: The same addition or multiplication on both sides of inequality is mainly used to solve linear inequality or quadratic inequality. Knowledge point 2: unary linear inequality.
1. Definition: An inequality with only one unknown number and the best degree of the unknown number is once is called a unary linear inequality.
2. Solution: Move items and merge similar items (move unknown items to the left and constant items to the right, and the sign will change after moving).
3. For example: 6x+8 & gt；; 9x-4, looking for X? Move the term of x to the left and the constant term to the right to become 6x-9x >；; -4-8, merging the same kind
-3x & gt； -12, x < 4 (remember to change the symbol).
Knowledge point 3: One-dimensional linear inequality group
4. Definition: An inequality group consisting of several linear inequalities is called a linear inequality group.
5. Solution: Find the value of each unary linear inequality, and finally find the intersection (common part) of these unary linear inequalities.
Knowledge point 4: Inequalities with absolute values
1. Definition: Inequalities with absolute sign, such as |x|a inequality and its solution.
2. The solution of simple absolute inequality:
| x | >； The solution set of a is {x | x >；; A or x < -a}, greater than both sides, greater than small. |x|
3. The solution of complex absolute value inequality:
| ax+b | & gt； C is equivalent to solving inequality ax+b & gt；; C or ax+b
Analysis: it is mainly clear whether to take the middle or the two sides, the middle is connected, and the two sides have the "or" knowledge point 5: a quadratic inequality.
1. Definition: An inequality that contains an unknown and the highest degree of the unknown is quadratic is called unary quadratic inequality. Such as: ax2 bx c 0 and AX2BXC0 (A > 0))
2. solution: find axbxc0 (a >; 0 as an example)
3. Step: (1) Shilling AX BX C 0 Find X (three methods: finding root formula, cross multiplication and matching method).
(2) After finding x, take both sides of the value greater than, and the value greater than is less than the value less than; If it is less than the middle, you can get the answer. Note: When a: 0, use the above steps to solve.
Expanding reading: a way to improve math scores after exams. First, review to make up for each other's shortcomings.
Adult college entrance examination admission only depends on whether the total score has passed the admission score. Even if you get zero in a certain scientific research, you can still be admitted as long as the total score of the other two subjects exceeds the admission score. Therefore, for those candidates who are seriously biased, instead of wasting their time on subjects they don't know, it is better to spend their limited time on superior subjects. For example, many candidates can't speak English, so everyone will focus on Chinese and math subjects.
Second, learn the skills of scoring.
In the first point, we said that we should learn from each other's strong points to set aside limited time to review which subjects you can understand. Then, don't give up completely on weak subjects that have not been reviewed! No, you can learn some grading skills to improve the scoring probability of multiple-choice questions that you can't do. For example, the adult college entrance examination English multiple-choice question scored 105, accounting for 70% of the total score 150. If everyone learns to get points, the multiple-choice question with a score of 105 may get points. There are also 85 multiple-choice questions in adult college entrance examination mathematics. There are many multiple-choice questions in adult college entrance examination, so you can learn the skills of grading.
Third, improve your grades by doing problems.
The purpose of taking the adult college entrance examination is to improve your grades and keep the minimum admission score. Then in the final review time, you can review the questions in a targeted way. Doing problems can not only consolidate your knowledge points, but also find out where the knowledge points you don't know are, and then find relevant materials to review.
Fourth, find the key points according to the exam outline.
Finally, in the review stage, everyone should know which are the key points and which knowledge points only need to be understood. Then you can focus on reviewing what important knowledge points. The outline of adult college entrance examination introduces the knowledge points of each subject, and also divides the knowledge points of each chapter into grades. For example, you don't need to spend too much time and energy on the knowledge points you need to master.