Math diary 1 how to write it?
This Thursday, a good thing happened that excited me.
At the end of a class on Thursday, I sat in my seat. The math teacher called me, Liu Yiheng and He Yi and said to us, "After school in the afternoon, your class will have a China Cup school tryout. You three are the top three in the total test scores of the four units in your class, and three representatives from the other two classes came to participate in the selection, and then three of your nine were selected to participate in the China Cup. " Hearing this, I am both excited and nervous. I am very happy to have this opportunity, and I am also nervous about the strength of my competitors.
On this day, I spent it in the ambivalence of excitement and tension.
School is almost over, and we are waiting for the math teacher and other students in the classroom.
The math teacher came, and so did the students from other classes. The math teacher said to us, "Do two questions one by one, and the exam time is 30 minutes. Whoever does it quickly and well will have the opportunity to participate in the China Cup. " Finally, she added, "If you can get a place in the China Cup, many middle schools will recruit you." After that, the teacher began to hand out papers.
I read and do topics with a nervous and excited mood. The first question is relatively simple. I solved it by solving the equation, and it was finished soon. I can't help feeling a little smug. But the next question hit me hard, and the ever-changing amount dazzled me. I calculated it on paper again and again, but I still didn't figure it out. I am depressed, but I can't help it. I stared at the topic, thought hard while watching it, and finally understood it. I listed the equations and solved the problem by cross multiplication. After checking, I handed the paper to the teacher and began to do my homework. Soon, 30 minutes passed. After all the students handed in their papers, the teacher immediately corrected them and announced the results of the selection: "Liu Jingwen got it right ..." When I heard this, my heart was pounding and I was so excited that I couldn't describe it in words.
This time, I, Wu Xiaotao from Class Two and Wu from Class One went to see the China Cup.
The three of us stayed, listened to the teacher's time and place, and went home.
Soon, I will represent my school in the China Cup. Can I enter the finals and finals? There is confusion ahead.
How to write 2 in math diary
At this moment, the bell rang and I rushed into the classroom.
I love literature because I like ancient poems. When I felt helpless about life, I thought of Li Yu, the king of national subjugation. He once said, "How much sorrow can you have, just like a river flowing eastward." Because poetry can soothe my inner wounds, only poetry can understand me at this time. I regard poetry as my friend and poetry as my pen pal.
It is not easy to study in university. Isn't studying hard at ten cold windows just to fly high through the college entrance examination? When I entered the university, I found that the university was not my ideal paradise. I say to myself repeatedly every day, "What have we really learned after graduating from college? I don't think college is even as good as high school. Universities recruit students from all over the world. Every student comes to a different school, and their quality varies greatly. A person's poor grades show that he is of high quality. At this time, I am sitting in the classroom having a math class. The classroom is too noisy. As far as discipline is concerned, people who don't know think we are holding a debate. Teachers don't care about discipline either. She left after class.
From the time I entered this school, I passed the written interview and entered the boys' department of the student union. The main duty of this department is to check hygiene. Really tired! I just got up earlier than the chicken and went to bed later than the dog. I get up at 5: 30 in the morning to run. According to the regulations of this department, I have to check the dormitory at night and go to bed at least at eleven o'clock. Joining the student union is mainly about joining the party, followed by exercising yourself. It's not easy to stick to it!
I walked out of the classroom quickly when the bell rang. It's raining heavily outside. Fortunately, I brought an umbrella. I like to plan ahead best. In Zuo Zhuan, it is said that if you think about it, you will be prepared.
I can confidently say to others, "If you are determined to do anything on the road, the world will make way for you."
How to write 3 in math diary
In recent weeks, we have learned the multiplication of two digits, and what kind of multiplication can be calculated skillfully. Let me talk about one of them.
In today's math class, the teacher asked us to calculate several multiplication formulas as follows:15×1,27× 1 1, 13× 1, 34× 65438. Many students worked out the figures right away, but I still didn't write them out, so I was worried.
I only heard the teacher say, "Stop, students who haven't written well should stop writing. Listen to other students' methods. Why do they calculate so fast? " Ye, the fastest student in our class, said, "I calculate so fast because one factor in these multiplication formulas is 1 1, and there is such a trick." "The hundredth digit of the product is the number on the tenth place of another factor, the tenth digit of the product is the sum of the number on the tenth place and the number on the fourth place of another factor, and the fourth place of the product is the number on the fourth place of another factor. For example, 15× 1 1, one percent of the product is 1, one tenth of the product is 1+5=6, and the unit of the product is 5, so15×1/. Do you understand? " "I understand!" The students said in unison. "Why is this possible?" I asked the teacher. The teacher smiled and said, "Yes, who knows why?" The students shook their heads. "We can look at it vertically. Can we find any little secrets? " So we all started to arrange vertically. Under the guidance of the teacher step by step, we finally found that the number on the product ten is the sum of 1 10 and 50. Oh, that's it. I see.
Later, the teacher asked us to calculate 47× 1 1. Some students said 4 17, some students said 4 1 17, and some students said 5 17. I raised my hand to explain to my classmates, "The unit of product is 1×7=7, the ten digits of product are 4+7= 1 1, the decimal digits are 1, and the decimal digits are 1. After listening to my method, the students all nodded and said yes, and my mind was also happy.
Later, the teacher came up with these questions: 1 1×75, 22×25, 18×33, and we all worked them out quickly. Students, can you work it out?
A class passed unconsciously, and the teacher asked us to sum up our gains. Everyone has their own opinions, and everyone's face is full of smiles. Finally, the teacher sent us this sentence: "To learn mathematics, we should not only know what it is, but also know why."
How to write 4 in math diary
1 Prove that the triangle is a right triangle.
2 Used for correlation calculation in right triangle.
It is helpful for you to remember cosine theorem, which is a special case of cosine theorem. At the beginning of China's earliest mathematical work "Parallel Calculation of Classics in Weeks", there was a dialogue in which the Duke of Zhou asked Shang Gao for mathematical knowledge:
Duke Zhou asked, "I heard that you are very proficient in mathematics. Excuse me: there is no ladder to go up in the sky and no ruler to measure on the ground. So how can we get data about heaven and earth? "
Shang Gao replied: "Numbers come from mutual understanding and circle understanding." There is a principle: when the moment of a right triangle gets a right-angled side' hook' equal to 3 and the other right-angled side' chord' equal to 4, then its hypotenuse' chord' must be 5. This truth was summed up when Dayu was in charge of water conservancy. "
From the above conversation, we can clearly see that people in ancient China discovered and applied the pythagorean theorem, an important principle of mathematics, thousands of years ago. Readers who know a little about plane geometry know that the so-called Pythagorean theorem means that in a right triangle, the sum of the squares of two right-angled sides is equal to the square of the hypotenuse.
Using hook (a) and rope (b) to represent right-angled triangle respectively to get two right-angled sides, and using chord (c) to represent hypotenuse, you can get:
Hook 2+ rope 2= chord 2
Namely:
a2+b2=c2
Pythagoras theorem is called Pythagoras theorem in the west, and it is said that Pythagoras, a mathematician and philosopher of Pythagoras, first discovered it in 550 BC. In fact, this mathematical theorem was discovered and applied in ancient China much earlier than Pythagoras. If it can't be verified that Dayu's flood control is a long time ago, then the dialogue between Duke Zhou and Shang can be determined in the Western Zhou Dynasty around 1 100 BC, more than 500 years earlier than Pythagoras. Hooking 3 strands, 4 strings and 5 strings is a special application of Pythagorean theorem (32+42=52). So it should be very appropriate to call it Pythagorean Theorem in the field of mathematics now.
In the later book "Nine Chapters of Arithmetic", Pythagorean Theorem got a more standardized general expression. The book Gou Gu Zhang said: "Multiply the hook and the stock separately, then add up their products and make a square root, and you can get the string." Put this passage into an equation, that is:
Chord = (hook 2+ rope 2)( 1/2)
Namely:
c=(a2+b2)( 1/2)
Theorem:
If the two right angles of a right triangle are A and B and the hypotenuse is C, then the square of A+the square of B = the square of C; That is to say, the sum of squares of two right angles of a right triangle is equal to the square of the hypotenuse.
If three sides A, B and C of a triangle satisfy A 2+B 2 = C 2, for example, a right-angled side is 3, a right-angled side is 4, the hypotenuse is 3x3+4x4=XxX, and X=5. Then this triangle is a right triangle. (called the inverse theorem of Pythagorean theorem)
Source:
Pythagoras tree is a basic geometric theorem, which was traditionally proved by Pythagoras in ancient Greece. It is said that after Pythagoras proved this theorem, he beheaded a hundred cows to celebrate, so it is also called "Hundred Cows Theorem". In China, Zhou Kuai Shu Jing recorded a special case of Pythagorean Theorem, which was reportedly discovered by Shang Dynasty's Shang Dynasty, so it is also called Shang Gao Theorem. Zhao Shuang in the Three Kingdoms period made detailed comments on Pythagorean Theorem as proof in Zhou Bi suan Jing. France and Belgium are called donkey bridge theorem, and Egypt is called Egyptian triangle. In ancient China, the shorter right angle side of a right triangle was called a hook, the longer right angle side was called a chord, and the hypotenuse was called a chord.
How do you write 5 in math diary?
I have been worried about my unstable math scores before. Because I can't get 100 in every exam. Every time I don't do well in the exam, I always go home to be questioned by my father who has high requirements for mathematics, but I can't find a reason to explain it. Because the wrong question is not a problem. So I was defeated by carelessness! Therefore, I have been looking for a good way to overcome carelessness. I don't want to be tortured by my father every time
I didn't expect to find a way for nearly a year, and I found it in a math exam! It' s really "intentional planting flowers does not open, unintentional willows are shaded"!
Today's mid-term math exam, Mr. Cao repeatedly reminded us before the exam that every question should be drafted first and then written on the test paper, and counted again on the draft paper when checking. The exam began, and I answered the questions carefully. Of course, I didn't forget the teacher's reminder. I wrote the formulas on the draft paper one by one, and I asked a ruler for help from time to time. I calculated each question on the draft paper two or three times and checked it again. To be on the safe side, I wrote down the process of each application problem. For each step, I think about the reason first, and then write the next step. In order to make myself see the draft clearly, I changed my previous scribbles and the words on the draft paper were neatly written. Sometimes I close my eyes and meditate, and sometimes I bow my head. Ha! Finally successfully answered the test paper! I sighed! Look at the time, there are still 15 minutes left. I think we should check it again, not afraid of 10 thousand, just in case. I picked up a ruler and pencil again and slowly pondered over each question. After collecting the paper, the teacher collected the draft paper again. I only heard teacher Cao praise me, saying that my manuscript was written neatly and I had to take a good exam! I feel victory is in sight!
The paper was handed out, and I got 100 in math! I am ecstatic inside! It seems that making a good draft is really a good way to overcome carelessness! Later, I summed up my experience, and when I do the problem in the future, I should think carefully about every step of writing, turn step by step, and correct the mistakes immediately when I find them. Otherwise, it will be much more difficult to look back for mistakes after you finish the whole course. More importantly, you should not only write a draft, but also write it carefully, so that your heart will calm down. If your draft is scribbled, you may not see anything clearly. Even if you can see clearly, it will take a long time to tell. With this golden key, I no longer have to worry about the "enemy" of carelessness!
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