(1) step-missing solution: break down the problem that you can't do into a series of steps, or solve as many small problems as possible, and write a few steps if you can count them. Complete part of the scoring points to get the corresponding score. Although this method can't calculate the final conclusion, it can get the corresponding score.
(2) Jump Answer: It is common for the problem-solving process to get stuck in a transitional link. At this time, we can assume that some conclusions are correct, and infer whether we can get a conclusion or see what conditions are needed to make the conclusion stand.
If you are in the right direction, you can go back and answer other steps, and it is not impossible for you to finish this question smoothly. If you come up with other steps in the process of interpretation, don't insert them at will at this time, you can make them up at the back first, and then sort them out after the whole problem is solved smoothly.
(3) When you encounter problems that you can't do, remember to give up and leave blank. Blanking is nothing, and the marking teacher can't help if he wants to. Mathematical problem solving is step by step. Generally speaking, the first step and the second step are relatively basic. Take a few steps if you can. If you can't work out any formula, it's better to copy down the first half of the topic and don't leave it blank, because some math problems are the first half of the topic, which is a known condition and the first step to write when solving problems.
Extended data
Test center 1: set and simple logic
(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 Cu A, 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.
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) Can A deduce B under sufficient conditions?
(2) See if B can deduce the necessary conditions of A?
A, if A is B, then A is the necessary and sufficient condition (necessary and sufficient condition) of B?
B. If A is B but B > A, then A is a necessary and sufficient condition for B..
C. if it is better >; B but b, then a is a necessary and sufficient condition for B.
D. if it is better >; B but B > A, then A is neither a sufficient condition nor a necessary condition for B. Skill: You can judge the scope of the propositions of A and B first, and then pass the "large scope >; Small range, small range
Test Site 2: Inequality and Unequal Groups
(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. when both sides of the inequality are multiplied or divided by a negative number, the direction of the inequality Changes (">" change ").
(3) One-dimensional linear inequality
1, definition: there is only one unknown, and the best number of unknowns is once, which is called 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 x term to the left and the constant term to the right, and become
6x-9x & gt； -4-8, -3x > After merging similar items; -12, x < 4 (remember to change the symbol).