Is there any salvation for my math? Can anyone help me?

The acceptance of knowledge and the cultivation of mathematical ability are mainly carried out in the classroom, so it is necessary to pay attention to the learning efficiency in the classroom and seek the correct learning method. During class, you should closely follow the teacher's ideas, actively think about the following steps, and compare your own problem-solving ideas with what the teacher said. In particular, it is necessary to grasp the learning of basic knowledge and basic skills, and review them in a timely manner after class without leaving any doubts.

First of all, it is necessary to recall the knowledge points taught by the teacher before doing various exercises, correctly grasp the reasoning process of various formulas, and try to recall as much as possible without using the act of turning the book immediately if it is not clear. Conscientiously and independently complete homework, diligent thinking, in a sense, should not cause a learning style that does not understand that is asked, for some topics due to their own unclear thinking, difficult to solve for a while, should let yourself calm down and seriously analyze the topic, try to solve it yourself. In each stage of learning, it is necessary to sort out and summarize the points, lines, and surfaces of knowledge to combine and weave them into a knowledge network and incorporate them into their own knowledge system.

2. Do more questions appropriately and develop good problem-solving habits.

If you want to learn mathematics well, it is inevitable to do more problems, and you must be familiar with the solution ideas of various types of questions. At the beginning, you should start with the basic questions, take the exercises in the textbook as the standard, practice repeatedly to lay a good foundation, and then find some extracurricular exercises to help you open.

Of course there is salvation! I wasn't very good at math, and I often passed a little bit, but after doing problems, summarizing and tutoring, my math scores improved significantly. Once, I was in the top 10 of my grade, and I couldn't believe it, but I gradually became interested.

If you can't realize your dream of studying economics, it's good to be the host of an economic column.

In fact, there is nothing in the world that cannot be done, however, if you do not have absolute patience and confidence, I suggest that you still do not tutor, because the key to mathematics is accumulation and application, and you can get a lot of content from just a 12-point number series There may be trigonometric functions, functions, or more, and it is not enough to simply understand knowledge Moreover, I think your major is also very good, and I believe that in this field, you will still make a difference.

If you do decide to do it, I recommend that you learn solid geometry first, because it has less content and can be easily used, which will give you the confidence to tackle math.

In symmetry group S4, (134)(12)(1342),(2143)(1): The estimation problem is inverse.

2.In the polynomial ring z11x, (6x2)11[0].

3.Let g (a) be a 6th-order cyclic group, then the number of nontrivial subgroups of g is 2.

4.In the remaining ring z6 of modulo 6, all the roots of equation x2 1 are [1], 5].

5.All zero factors for ring z10 are [2][4][5][6][8].

6.Let a and b be the set, | a |＝2，| b |3, a total of 9 mappings from A to B can be defined, of which there are 6 single shots, 0 full shots, and 0 double shots.

7.Let g (a) be a cyclic group of order 10, then the number of nontrivial subgroups of g is 4

8.In the remaining class ring Z18, 8 12 2] ,6 · 7 6] 。

9.All zero factors of ring Z6 are [2], [3], [4] .

5.Let be a finite group of order even to prove that :

1) The number of elements greater than 2 must be even;

Consider a and -a they appear in pairs.

2) The number of elements in the intermediate order equal to 2 must be odd.

Draw on the conclusion of 1.

You're so good, you've got all the abstract algebra problems!!

A group of order 11 has only two subgroups.

I don't know what the teacher gave me.

I'll give you some of the answers when I'm done this morning.

Double angle formula.

sin2x=2sinxcosx

Your topic is the inversion of this formula.

(1) square meters. (2) cubic meters (3) square meters.

1) cubic meters (2) cubic meters.

（1） (2) (3)

It's all equations, you do the math.

Let the number of sheets for $5 be x, then the number of sheets for $2 is 4x

Columnable equation: 5x+2*4x=299

x=23 then 4x=92

So 23 for 5 yuan, 92 for 2 yuan.

Let the number of 2 yuan sheets be x, and the number of 5 yuan sheets is y sheets, and obtain 2x+5y=299 x=4y bicubic formula x=92 y=23

1) Let the original bottom side length be xcm, then the original volume v=10x 2 when the side length is reduced by 15 resistance to sensitivity, the side length is 15 x, and the changed volume v=10(15 x) 2=

Before the change After the change = take the vertical 10x 2=

i.e. percent change in volume is.

f(x) is monotonically derivable on [0, 4], indicating that the domain of f(x) is [0, 4], and f(x) is monotonic on the domain of definition, because only monotonic functions have inverse functions; Derivable, indicating that the curve is smooth; It is only under these conditions that there is no disagreement in question 2;

The value range of the inverse function is the definition domain of the direct function, so the value range of the inverse function is [0, 4];

As for f(0)=?Not necessarily! The title says f(0)=0, there may be other conditions, and only for the conditions given by the title, it is not certain that f(0)=0

The second sentence should be to use the value range of the inverse function as the definition domain of the original function, but I didn't understand the first sentence, I'm sorry for the university teacher, leave the name and other answers.