Why can t I find anything to answer a math problem It s not all math problems Do you know what I mea

This mainly depends on how the search engine retrieves and locates, for now, the engine is relatively efficient, and the accuracy of the retrieved questions is still relatively high, and it is not easy to achieve such a standard. For example, the math questions mentioned in the answer are not math problems, mainly for the following reasons.

Common math problems are often defined by people as life categories, not math categories, in this case, the recommendation system's matching of math categories is interfered with, so the pushed questions are not math categories.

Many math problems are described with **, do not contain formulas, and there are no related problems and numbers and other data, for this situation, the current text search engine is not able to solve, at least until the data search engine is upgraded to**mixed recommendation is possible.

Mathematical problems are difficult to define, and the rules of the relevant recommendation system cannot accurately distinguish which ones belong to mathematical problems, and for massive data, speed is the top priority.

Of course you do! You have to choose the category you are interested in in the problem category, and most of the questions that come out are the ones you are interested in.

I'm also very depressed, your problem is also classified into mathematics, it seems to look at keywords, a lot of nonsense.

You can pay attention to math problems, and after clicking on it, there will be more math problems!

Summary. It takes 220 sticks, and there are 14 sticks in a box.

Please wait a minute or two, and I'll help you find out.

Homework help can't find the question can be text search, that is, directly hand on the search world hungry side of the question, there will be professional personnel in the background of the homework help to answer. If you can't find a math problem, you can choose to solve it yourself, or consider asking for help from others, and quietly tell you about your problem, and I will try my best to help you solve the problem.

Question 3. Wait a minute.

6 boxes and 3 sticks, is it 6+3 or 6-3.

How to do this question?

You wait a minute, I'll do it.

Thank you. It takes 220 sticks, and there are 14 sticks in a box.

Understanding math problems usually requires a certain amount of professional knowledge and skills, as well as some habits of mind and experience. If you don't understand the meaning of a math problem, it could be one of the following reasons:

1.Lack of basic knowledge or skills. If the mathematical knowledge and skills are not solid enough, it will be difficult to understand and solve the more complex problems.

2.Lack of reading comprehension skills. Understanding math problems also requires reading and comprehension of the questions, and if the reading ability is not strong enough, it is easy to misunderstand or understand the bias.

3.Limited thinking and logical abilities. Math problems need to be analyzed, reasoned about, and solved, and if the individual's thinking and logic skills are not strong enough, the difficulty of understanding becomes more obvious.

4.Lack of practice and experience. The ability to understand and solve mathematical problems can be gradually improved through continuous practice and accumulation of experience.

In view of the above problems, you can improve your ability by systematically learning mathematical knowledge and skills, strengthening your reading ability, cultivating thinking and logic ability, and practicing many times. Also, if you still can't understand a math problem, you can seek help from someone else or a teacher.

1.Inverse proposition: If x 2, then x 2. True.

No proposition: If x 2, then x 2. True.

Inverse negative proposition: If x 2, then x 2. False.

2.Inverse proposition: If x 2, then x 2. False.

No proposition stupid balance: if x 2, then x 2. False.

Inverse negative proposition: If x 2, then collapse x 2. True.

4.（1）（1，-1，2）。（2）14。（3）45。(4) (take gear round 3, 11, 10).

Summary. Let the speeds of A, B, and C be v1, v2, and v3, respectively, and v1> v2> v3. The equations for the time and distance for A to catch up with B and C are listed respectively:

20v1 - 20v2 = 400 60v1 - 60v3 = 400 120v1 - 120v2 = 800 140v1 - 140v3 = 800 , v2 and v3 are represented by v1: v2 = v1 - 20 400 = v1 - = v1 - 6 400 = v1 - substitute v2 and v3 and simplify: :

120v1 - 120( =800, solution v1=:140v1 - 140( =800, solution v1 = Therefore, the velocity of A is, the velocity of B is, and the velocity of C is. The difference in velocity between B and C is.

The time it takes for A to catch up with C for the first time is (60-20) = 40 seconds.

Hello, you can take a picture of the question and send it out.

Answer these two questions.

Write down the steps and ideas. Thank you.

Let B's velocity be V, then at the 20th second, A runs 400 meters more than B, i.e.: 20 13 - 20v = 400 simplified to obtain: v = m second) At the 120th second, A runs two more distances than B, i.e.:

120 13 - 120v = 2 400 simplified: v = rotten Zheng worm in milliseconds) Therefore, B's velocity is in milliseconds.

Let the speeds of A, B, and C be v1, v2, and v3, respectively, and v1> v2> v3. The equations for the time and the positive distance between A and C are listed separately: 20v1 - 20v2 = 400 60v1 - 60v3 = 400 120v1 - 120v2 = 800 140v1 - 140v3 = 800 , v2 and v3 in are represented by v1:

v2 = v1 - 20 400 = v1 - = v1 - 6 400 = v1 - substitute v2 and v3 into , and simplify: :120v1 - 120( =800, the solution is v1=:

140v1 - 140( =800, solution v1 = Therefore, the velocity of A is, the velocity of B is repentance, and the velocity of C is. The difference in velocity between B and C is. The time it takes for Ajiwu to catch up with C for the first time is (60-20) = 40 seconds.

Summary. When the area is 522, what should I do if the value of x is 10 or 30 and the problem cannot be found.

12 points) There is a farm plan to build a rectangular breeding shed with an iron mesh fence, as shown in the figure, the back of the breeding shed is a ready-made earthen wall, and the other three sides are fenced with iron mesh, and the side length is x meters (1) If the iron mesh fence is 80 meters long and the feeding channel with a width of 1 meter should be left on both sides and in front of the breeding shed ( Find the functional relationship between the effective breeding area y (square meters) and x (meters) of the breeding shed, and find the x value when the effective area is 522 (square meters); ( If the existing earthen wall behind is long enough, how to design, in order to make the effective breeding area maximum (2) If the construction of the breeding shed area is 800 square meters, the construction cost of the iron mesh fence is 200 yuan, then, when x is what is the value, the total construction cost of the iron fence z is the smallest, and find the minimum value of z.

You can take pictures.

12 points) There is a farm plan to build a rectangular breeding shed with an iron mesh fence, as shown in the figure, the back of the breeding shed is a ready-made earthen wall, and the other three sides are fenced with iron mesh, and the side length is x meters (1) If the iron mesh fence is 80 meters long and the feeding channel with a width of 1 meter should be left on both sides and in front of the breeding shed ( Find the functional relationship between the effective breeding area y (square meters) and x (meters) of the breeding shed, and find the x value when the effective area is 522 (square meters); ( If the existing earthen wall behind is long enough, how to design, in order to make the effective breeding area maximum (2) If the construction of the breeding shed area is 800 square meters, the construction cost of the iron mesh fence is 200 yuan, then, when x is what is the value, the total construction cost of the iron fence z is the smallest, and find the minimum value of z.

Steps. The picture did not leak out <>

Title. Can't find it. If the relationship is y=-2x +80x-78 and the area is 522, the value of x is 10 or 30

When the earthen wall is 20 meters, the breeding area is the largest, which is 722 square meters.

The above figure shows the steps of this question.

Summary. Hello, I am a professional education services teacher and it is a pleasure to be able to serve you. I have already understood your questions, you don't need to worry, I will inquire and answer your questions immediately! Please wait a minute!

Hello, I am a professional education services teacher and it is a pleasure to be able to serve you. I have already understood your questions, you don't need to worry, I will inquire and answer your questions immediately! Please wait a minute!

Good. If you can't find a math problem, you can choose to solve it yourself, or consider asking someone for help, tell me about your problem, and I will try to help you solve it.

The first question of the second question.

Which question. Question 2.

The first question.

I don't have a pen and paper in my hand, and we are mainly responsible for teaching methods, not doing problems, so I don't have other tools.

Good. y＝3xe＾（3x）＋3x＾2

This is a composite function derivative problem.

3. After opening the camera, click "Topic" in the options at the bottom of the interface.

5. After taking a picture, you can get a detailed solution to the math problem.

with a one-dimensional equation.

Set rice at x yuan per catty.

Flour is (x+0. Bureau Zen 8) yuan.

Columnable equations.

40x—sail and 4=30(x+.)

The solution. x=

So: the state of the state of the wax staring money is:

40x—4=100

A: --