Lin Wan was not as straightforward as Yu Hua. She got up and went to the toilet to wash her hands, returned to her seat, took out a Juanxiu handkerchief from her bag, wiped her hands, took out the rice spoon, picked up the steamed bun in one hand, and held it in the other.
The rice spoon scooped up the white radish. Although the food was simple, the manners were decent and orderly.
Yu Hua glanced at the dining appearance of Lin Wan, the boss next door, and sighed in his heart. He was indeed a child raised by an upper-class family. Even if he was eating steamed buns and radishes, he still did not lose his etiquette.
His mouth is always busy and his hands are always busy.
Three times five divided by two, Yu Hua ate his dinner. After filling his stomach, he quickly washed the dishes, then returned to his seat and started to work.
The English homework is relatively simple. Just write an essay. I wrote a running account of the journey from home to school, which is enough.
Party spirit requires writing articles on the domestic political landscape and parties, from the political situation of the Qing Dynasty to the Nationalist political situation, and describing it in detail.
Party principles, this is the politics of later generations, should be classified in the liberal arts. However, due to the times and circumstances, whether it is the first category of literature or the second category of Neo-Confucianism, it is mandatory to learn the party principles.
Of course, the literary literacy of students in this era is very high, so it is not difficult to save Chinese language and party spirit.
Yu Hua didn't have any unique views on party ethics, and he didn't need to give any opinions. He just behaved himself. It took him two hours and at eight o'clock in the evening, he completed the party ethics holiday homework.
"Huh, I finally finished writing. It's still early. Let's look at mathematics." Yu Hua put down the pen, his right hand was sore, and gently rubbed his wrist. He looked at the party homework filled with handwriting, and he breathed a sigh of relief and felt his condition.
Not bad, I'm going to do some arithmetic for a while.
Arithmetic is the main subject and this cannot be ignored.
It's eight o'clock now, and the library won't close until 11 o'clock, which is still very early.
Rubbing his wrists, Yu Hua looked up and looked around. Lin Wan was still sitting next to him, holding a pen in his hand. He didn't know what he was writing. The desks around him were all filled with students wearing thick cotton coats, reading books with the help of the lights in the library.
Some people wrote to answer the questions, while others read quietly and recited the text in a low voice.
The school has a rule that, except for studying in the library, students must turn off the lights and go to bed before ten thirty minutes. This rather magical rule has given rise to the motivation of students to go to the library.
At night, there are no other light sources in the school except the library, and even the street lights are off.
After taking a look at the surroundings, there was a strong atmosphere of study in the air. Yu Hua rested for ten minutes, calmed down, and felt that his state seemed to be back. He opened the arithmetic textbook without stopping and started new study.
I have been copying homework all day today, and there is not much time for homework and study. The physical load and consumption are not high. Yu Hua just feels a little tired now and has not reached his usual study limit.
In the morning, the arithmetic progress reached the point where trigonometric function lines are used to solve inequalities. Yu Hua went directly to the trigonometric function lines to prove the minor rule of trigonometric function inequalities.
Prove: when x∈(0,π/2), sinx Yu Hua read this question and already had an idea in his mind. This question is based on trigonometric function lines. It tests the idea of combining the sector area formula and number shapes. As long as the unit circle is drawn and the trigonometric function line is marked,
, and then convert the required proof of inequality into an intuitive comparison of the sizes of line segments and radians, and you can solve the problem easily.
With a relaxed and calm face, Yu Hua held a pencil in his right hand and quickly drew the rectangular coordinate system and unit circle on the draft paper, marked the trigonometric function lines, and after a brief observation, he had the answer in his mind.
After a minute, the answer was given.
After mastering the knowledge points, he moved his eyes downwards and looked at the domain of trigonometric functions. After a few glances, Yu Hua completely understood the domain problem. To solve the domain of trigonometric functions, he mainly mastered the tangent function. The domain of the tangent function Y=tanx: X
≠π/2+kπ,k∈Z.
He has already used this knowledge point, in the final question of solving inequalities on a trigonometric function line.
Domain of trigonometric functions, over.
Use the induction formula to compare sizes, over.
Symmetry of trigonometric functions, over.
Trigonometric function inequalities proof problem, over.
"Swish, swish, swish..." The sound of pencil swiping at high speed continued to be heard. The swiping speed was so fast that Lin Wan, who was studying, heard the movement and couldn't help but look sideways at Yu Hua, who was looking at the arithmetic book with excitement on his face.
, shook his head gently.
At this moment, compared to the torturous state when writing Chinese, English and party ethics, Yu Hua felt refreshed and comfortable when he returned to mathematics. He felt that there was nothing more comfortable in the world than studying mathematics.
Time passed slowly. Yu Hua, who was immersed in a state of selflessness, solved the questions faster and faster. After about half an hour, he fully mastered the entire chapter of arithmetic trigonometry. Yu Hua mastered at least three solutions to each difficult knowledge point, and his knowledge accumulation was extremely solid.
.
Completely mastering trigonometry means that Yu Hua's learning progress has completely kept up with the pace of the class. The arithmetic textbook has officially announced that it is coming to the end of his life. There is only one final hurdle left in the set, probability and statistics.
Probability statistics is the key content that will be covered in the sixth semester, and it is also the focus and difficulty of high school mathematics in later generations.
As long as you pass the threshold of probability, the arithmetic textbook will be smooth sailing, with no more difficulties, just some side details that are not worth worrying about.
"continue!"
Looking at the traditional Chinese introduction to the chapter on probability and statistics, Yu Hua took a deep breath. He was not proud. The knowledge he now has can only be described as superficial. The arithmetic textbooks during the Republic of China were not very difficult. He just relied on the arithmetic knowledge in his mind.
, it is difficult to master the planned oxygen top-blown converter technology, let alone other things.
Don't be complacent, don't be complacent.
Go, go, go, keep going!
A drumbeat is as powerful as a tiger's. A true academic master must have his own momentum.
Opening the first chapter of probability statistics - the definition of counting principles, Yu Hua looked at the unfamiliar yet familiar mathematical descriptions, and gradually immersed himself in the state of learning. The whole person was like a shriveled sponge, with an unprecedented new attitude and efficiency.
Absorbing the mathematical knowledge of this era.
Compared with the perfect and comprehensive probability and statistics of later generations, the probability statistics of the Republic of China lacked some content, but the basic counting principles, permutation and combination, binomial theorem, probability of random events and geometric concepts, as well as the core normal distribution
, a lot of everything.
"Boom!"
At eleven o'clock in the evening, with a dull and distant bell ringing from the school, it was time for the library to close.
Many students withdrew from their studies, packed up their things and left.
Lin Wan, who had been studying English all night, packed up her books and tools. After finishing packing, she glanced at Yu Hua who was still writing furiously at the desk next door. She stepped forward and patted Yu Hua on the shoulder: "Classmate, eleven o'clock
Yes, it’s going to be closed.”
"I'm sorry, I was so fascinated." Yu Hua suddenly stepped out of his study state when he felt someone filming him. He was a little confused. When he looked up, he saw that it was Lin Wan. There were sounds of bells in his ears, which made him feel a little uncomfortable.
He scratched his head in amusement.
"This is the first time that I can read an arithmetic book as a literary masterpiece." Lin Wan saw Yu Hua's expression as if he still had something to say, and couldn't help but smile and said with emotion.