In origami, you can fold a piece of paper in half and then fold it in half, and then unfold it. At this time, there will be a "ten" crease in the center of the paper. Then take out another pen and frame the periphery of this crease, that is, draw a word "mouth", so that a pen writes a "field"
I hope so, O(∩_∩)O Thank you.
The problem of one stroke is a simple mathematical game, that is, can a graph composed of curve segments on a plane be drawn with one stroke so that it does not repeat on each line segment? For example, Chinese characters' day' and' middle' can be drawn with one stroke, but' day' and' wood' can't.
As early as the18th century, the famous Swiss mathematician Euler discovered a law. Euler believes that a graph that can draw strokes must be a connected graph. Connected graph means that all parts of the graph are always connected by edges.
However, not all connected graphs can be drawn with one stroke. Whether a stroke can be made depends on the number of odd points and even points in the graph.
Mathematician Euler found that the law of strokes is:
■ 1. Any connected graph composed of even points can be drawn with one stroke. When drawing, you can start from any even point, and finally you can finish drawing with this point as the end point.
■ 6. Any connected graph with only two singularities (the rest are even points) can be drawn with one stroke. When drawing, one singularity must be the starting point and the other singularity must be the end point.
■ [14] None of the other paintings can be drawn in one stroke. If there are an even number of singularities divided by two, you can work out how many strokes are needed for this diagram. )
■ Supplement: the meaning of related nouns
◎ Vertex and exponent: Let a plane figure consist of a finite number of points and arcs, these points are called the vertices of the figure, and the number of arcs drawn from any vertex is called the exponent of this vertex.
◎ Odd Vertex: Vertex with odd exponent.
◎ Even Vertex: Vertex with even exponent.
2. Writing in Tian Zige 1 In order to cultivate students' good writing habits and facilitate teachers to correct homework, the writing format requirements for homework are formulated as follows: 1. Writing 1, written Chinese homework, pencils for grade one and grade two, and the transition period for grade three last semester. While doing homework with a pencil, practice using a pen or ballpoint pen, and use a pen, water-based pen or ballpoint pen for grades four to six.
2. Homework in all subjects should be written neatly and in block letters. Homework should be clean and not altered. No scribbling. Second, about the format 3, the writing format and requirements should be unified, and the class hours, topics and exercises of each assignment should be written in the center of the first line; Write the date of the assignment on the right side of the second line.
4. Leave a blank line between each problem assignment to show the difference; Leave three blank lines between the previous task and the next task to show the difference. 5. There should be corrections after each homework, so that students can correct the mistakes in their homework as required.
6. Every assignment is not allowed to be written under the topic, so it is natural to leave it blank (refer to the format of thinking questions after class in the textbook). Third, about book 7. The exercise books mainly checked are: writing new words in the first and second grades in a unified way; The new words in the third and fourth grades are written on a masterpiece; New words in grades five and six, and unified teaching plans; The compositions of grades three to six are written in the composition book.
All kinds of books use anti-myopia books uniformly. 8. Books accumulated after class are used in all grades.
Third, about content 9. Write new words and word combinations in the new word book of grade one and grade two. 10, the contents of new words in grades 3-6 are as follows: question 1: new words.
Mainly write pinyin, phonetic order, radicals, phrases and so on. (The number of words in a group depends on the students' situation). The second question: words.
Mainly write the new words in this class and the related idioms and phrases to be accumulated (how much to write depends on the students' situation, but the new words in this class must be written). Question 3: Good sentences.
Mainly write sentences worth accumulating in this lesson (at least three sentences). Question 4: Correction.
After the teacher corrects the homework, if there are no problems, you don't have to write this question. If it is wrong, write this question under the teacher's correction result. To write a typo or a different word, you must first write the whole correct word twice, and then write the typo three times; If the whole question is wrong, it will be repeated.
If there are many content errors, you should write book titles to distinguish them. A class assignment can be done once or twice according to the quantity.
Fourth, about the composition 1 1, write a table of contents on the first page of the composition; The second composition is different from the first page; 12, after the teacher corrects the composition, write the serial number and grade of the composition on the cover of the composition book. V. These Provisions shall be implemented as of March 20 13.
The homework correction of primary school teachers in Lianhua Town needs to correct students' homework, which is a very complicated work for teachers in teaching, but this work can best understand students' mastery of knowledge and is conducive to teachers' timely adjustment of teaching. Therefore, teachers are required to correct students' homework as follows: 1. Teachers should assign homework with purpose and pertinence to help students lay a good foundation, cultivate their abilities and develop their intelligence.
2. The homework topic should be accurate from form to content, and the weight, depth and breadth should be appropriate. They should be geared to all students and pay attention to teaching students in accordance with their aptitude. Class assignments should be done in class as much as possible.
Every day's homework should be controlled within the specified time. 3, homework must be corrected in time, generally should be handed in within one day after homework or before the next class.
The composition must be approved and distributed to students the day before the next composition, and must be approved before the next composition at the latest. Students' homework should be carefully graded. Grade one and grade two can be scored in a lively way that students like (but the requirements must be unified within the grade), and grade three to grade six can be divided into "excellent, excellent and good" (grade three can be evaluated by scores during the transition period, but the requirements must be unified within the grade).
After correcting, the teacher should write down the date of correction, correct the homework with a red pen, and write the score in the lower right corner of the homework. The grading standard is required by each preparation group. 4. Teachers should adopt different marking methods according to requirements, such as comprehensive marking, key marking, taking turns marking, face-to-face marking, guiding students to evaluate each other or self-evaluation, and so on.
5. Strictly require students to finish their homework on time, independently and neatly, and criticize, educate and supplement students who are absent from homework without reason in time; Plagiarism and carelessness should be redone. 6. All the mistakes in homework require students to correct them in time. If it is difficult to correct, the teacher should give individual counseling.
Teachers should also correct the revised homework. 7. Pay attention to the quantity and nature of errors after correcting homework every time, analyze the causes of errors, and make a brief record as the basis for classroom evaluation or improving teaching.
(You can prepare an "Operation Error Notebook"). 8. Teachers' requirements for correcting compositions are correct, standardized, correct and clear.
Teachers should always educate and urge students to finish their homework in time, write neatly, keep their notebooks clean and tidy, and have high accuracy. For students who are neat in writing and unique in solving problems, teachers should make targeted comments, and teachers' comments should be neat.
Encourage the progress of homework. There will be a homework exhibition at the end of each semester. 9. When correcting, try to find out the mistakes in your homework and circle them. The circle should be standardized, self-contained and clear at a glance.
10, students' exercises, the teacher should carefully correct, correct sentences, clear the level, and suggest appropriate use of eyebrow approval and general approval. In order to unify teachers' habit of correcting homework, it is necessary to standardize students' requirements and symbols for correcting homework.
In case of special circumstances, special treatment can be made. Now the symbols and related requirements for homework correction are as follows: 1. Chinese homework correction: mark "√" correctly, "*" wrongly, "√" wrongly or semi-correctly, typo or other word circles "○".
You can also write some simple comments in your homework. Comments should be encouraged, praised and guided. 2, composition correction: (1) typos or other words are circled with "○", and students are asked to correct them next to them. When they are right, the teacher uses √.
(2) correction, addition, deletion and exchange of contents. According to the relevant symbol specifications. (3) Those retained for use after deletion are denoted by △△△△△.
(4) Separate with "∨" to indicate another paragraph. (5) Underline beautiful words and sentences, and underline defective sentences. .
(6) Comments should be appropriate, encouraged, praised and guided. (7) composition.
3. How to write a word in Tian Zi Gerry 1) There is a writing method in Tian Zige.
2) Tian Zige is a template for standardizing the writing format of Chinese characters. Tian Zige includes four borders, a horizontal centerline and a vertical centerline. These four grids are called upper left grid, lower left grid, upper right grid and lower right grid. Only by gradually standardizing Tian Zige's Chinese characters can we lay a solid foundation for future Chinese learning.
4. Tian Zi writes correctly and writes the pronunciation [tián].
translate freely
1. Land for planting crops: ~ wild. Until.
2. Agriculture-related: ~ home. ~ garden.
Gu Tong "pawned" and went hunting.
4. Ancient "tenancy", farming.
5. Last name.
6. Group words: pastoral field Kantian Qitian Shetian
7. pastoral poetry
Step 8 explain
1. Fields and gardens.
2. Sentence: There is a village by the river, which is growing well.
3. Dian Cann Dian K.
1. Ridge in the field.
2. Sentence making: There are so many kinds of grass on the ridge that I can't name them.
3. Tianqi tián qī:.
Step 4 explain
1. See "Sanqi".
2. There are many medicinal materials here, such as Shā rotto Katakuri, bezoar, Tianqi and zedoary.
3. Tian She Tian Xie
Step 4 explain
1. Fields and houses.
2. Sentence: Tian She is over there. Although crude, it is particularly clean inside.
3.Tian Tian Tianyang
Step 4 explain
1. Fields, fields and wilderness.
2. Sentence: A worker is instructing a "mine detector" to mine in a field in Shimoyo.
5. How to write "Hou" in the grid format? Tian Zi grid format:
Basic explanation:
1. locative words. Back (referring to space, opposite to "front"): ~ door. Before and after the village.
2. Location words. Future; Later (referring to time, relative to "before and before"): ~ days. Day ~. ~ generation. Come first ~ arrive.
3. Location words. Near the end of the sequence (as opposed to "before, first"): ~ row. ~ fifteen.
4. Descendants refer to descendants, etc. : none ~.
5. Mrs. monarch: Huang ~. ~ princess.
6. In ancient times, you were called Jun: before Shang Dynasty.
7. Last name.
Related words
Behind the mother's consequences
Later, later, later.
Extended data
The antonym of "Hou": first, first.
First, the basic definition of "first":
1. First in time or order (relative to "last"): ~ Forward. ~ for example. Things. Fight for fear. Have something to say.
It means that an action or event has happened before: he knows better than me. Let me say something.
3. For the time being: Let's put this matter aside and think about it later.
4. ancestors; Last generation: ~ people.
5. Pay tribute to the dead: ~ Father. ~ fierce. ~ zhe.
6. Previously on Xiao Wang's skill ratio. Why didn't you tell me?
7. Last name.
Related words
Congenital first in first out
Mr. Wang has ancestors. First of all,
Make sentences:
1. It used to seem quite famous, but today, it has almost become food for the poor.
2. In the past, I mainly studied Sun Li's writing techniques. Now, from the perspective of writing style, I have been thoroughly remoulded and can form my own family.
Second, the basic definition of "money":
1. locative words. On the front (referring to space, as opposed to "back"): ~ door. Village ~ behind the village.
2. Forward: Forward. Don't back down.
3. Location words. Near the head (as opposed to the "back"): ~ row. His grades are always the third in the class.
4. Location words. Past; Earlier (referring to time, as opposed to "later"): ~ days. From ~. ~ a few years. ~ all the work was in vain. ~ unprecedented. ~ Never before, never after.
5. locative words. Former (refers to the organization that is now renamed, etc.). ): ~ Council.
6. Location words. Before something came into being: ~ Science (before science came into being). ~ Capitalism (before capitalism).
7. Location words. Future (used for prospect): ~ process. ~ scenery. Look forward, not back.
8. Frontline; Front: branch ~.
9. Last name.
Related words
Back and forth, back and forth.
The front door was advanced the day before yesterday.
Make sentences:
She cried for a long time before she stopped to tell us the whole story.
2. It turns out that the road of life is actually very simple, and uncertainty is the most painful. Once you make up your mind to move forward, you can still be happy even if the front is full of thorns.