my scientific age

Chapter 11 Feeling the power coming
……

Jinguo Hutong, Chongwen House.

After entering the house, Yu Hua went to the mourning hall first. The incense candles burned on the incense table, and there was a layer of ashes under the incense table. Three incense sticks were respectfully placed there, and he bowed three times in a row to pay homage to Yu Qinghe according to the custom.

Yu Qinghe, who had no mourning from relatives and friends, no funeral arrangements, and military style, repeatedly told Yu Hua to keep everything simple.

After serving the incense and doing some etiquette, Yu Hua came to the kitchen, washed the iron pot and the traditional Chinese medicine, then poured in a small half pot of ice water, put the traditional Chinese medicine into the pot with cold water, found a Dazhong brand match, took out a swipe and set it on the earthen stove. ignite.

This is the inconvenience of living alone, and all the tedious things need to be handled by hand.

"Look at the book."

Yu Hua, who felt the warmth of the stove, sneezed and shed a puddle of snot. He really felt a little bored. The excellent study state last night was unforgettable. I wonder if I can enter that kind of extremely focused study again today. state.

Just read math when you're bored.

He did what he said and stuffed a piece of wood into the stove. Yu Hua got up and went to the bedroom. He picked up the math textbook and pen and paper tools, and returned to the stove. By the firelight, he flipped through the books.

The progress last night was roughly three-dimensional geometry. The teaching knowledge points were derived from foreign higher education textbooks translated from Chinese to English, some from the UK, and some from Princeton. It was basically the same as the military weapons and equipment at this time, with rich styles, but no One belongs to Chinese mathematicians.

No way, in this era, the average level of the domestic mathematics community is far behind the world level of mathematics, let alone shoulder to shoulder, even catching up is an extravagant hope.

"One of the axioms of solid geometry: if two points on a straight line are in a plane, then the line is in this plane. The second axiom: if it passes through three points that are not on a straight line, there is one and only one plane..." Yu Hua Turning to the three-dimensional geometry chapter, reciting the three-dimensional geometry axioms that I have memorized in the past, the two memories in my mind are continuously merged and transformed into the text structure of this era.

He read silently in his heart, and when he encountered doubts and incomprehensions, he studied it. Yu Hua was happy, and the cold and fever did not seem to affect him.

Can learn!

Gradually, Yu Hua felt the power surge, and he entered a state of self-absorbed learning again. The content of the math textbook was easy to understand. What he thought was obscure and difficult to understand yesterday became simple and ordinary again.

After watching for a while, Yu Hua encountered a problem of angles formed by straight lines on different planes. EF is the edge AP of the triangular pyramid P-ABC, and the midpoint of BC. What is the angle formed by AB and PC.

The difficulty of this question is medium to high. It was written by a teacher at Latimer Middle School in the United Kingdom. He held a pencil in his right hand, and put a piece of scratch paper on his thigh. The whole person slowly calculated.

Solution: Take the midpoint G of PB and connect GE and GF.

EF is the midpoint of AP and BC, respectively, PC=8, AB=6.

Then GE∥AB, GF∥PC, GE=3, GF=4, the angle formed by the opposite right angle AB and PC is ∠EGF. In △EGF, GE+GF=EF is satisfied, and finally, △EFG is a right angle A triangle, and ∠EGF=90°, that is, the angle formed by the out-of-plane straight line AB and PC is 90°.

"It's all done in one fell swoop, it's very simple, go ahead." Yu Hua worked it out, wiping the snot out of his nose with his hands, a huge sense of accomplishment rose in his heart, he didn't dare to delay, and continued study.

Comfortable.

It's really comfortable. This kind of problem with straight lines on different sides has always belonged to the state of heaven. Every time Yu Hua sees it, he will suffer from dizziness and other diseases. Fortunately, he sleeps well, and now he has done it all at once. Feeling almost bursting.

Who can understand the joy of being a scumbag who can easily solve the exclusive problem of a scholar?
Only Bing Kuo Luo can compare with it!
"Grumbling..."

While burning the fire, I read the textbook on mathematics. After a while, white steam emerged from the cauldron, the water in it had already boiled, and the faint smell of traditional Chinese medicine overflowed from the side of the cauldron.

Smelling the smell of traditional Chinese medicine, Yu Hua adjusted the fire and changed it to medium fire. Then he continued to read the question. The angle formed by different straight lines belongs to the calculation basis of spatial solid geometry. Distance questions, etc., the content is cumbersome, the difficulty of the questions is medium, and most of the textbook questions are from British and German secondary schools.

However, the difficulty of this question is relatively moderate.

For those foreign high school students, these knowledge points involving basic solid geometry are not difficult. For domestic middle school students, these things are equivalent to ghosts, and many people have a headache when they see it.

Yu Hua is still good. He has been honed by the tactics of the sea in later generations. Not to mention he has experienced many battles, at least he has rich experience.

"Ah embarrassing!"

After sneezing, Yu Hua rubbed his hands, and his spirit became more and more trembling. The pain of cold and fever did not affect the learning efficiency. As he was immersed in efficient learning, more and more mathematical knowledge points were broken and entered the depths of the brain. Storing, meanwhile, gets more and more excited brains that are encouraged.

Dihedral concept,
Dihedral angle related issues,
Calculate the distance from the point to the plane,
distance between two parallel planes,
The method of equal volume to find the distance in space,

straight-line distance,

In the middle of frying a pot of Chinese medicine, it took two hours to master the calculation of three-dimensional geometry in space and three-dimensional geometry.

Yu Hua woke up from the extremely focused state of ecstasy, his head felt a little deprived of oxygen, and his right hand was a scratch paper full of mathematical symbols and handwriting. This was already the tenth sheet.

"Huh...Take a break for a while, it seems that this family is not only a little high in talent, it's just learning efficiency, a proper learner, but why Yu Hua's grades in the class are mediocre, strange, but according to this progress, A perfect score in mathematics is expected." Closing the textbook, putting away the pencil and scratch paper, Yu Hua took a deep breath to relieve the symptoms of hypoxia in the brain, rubbed his swollen forehead, and felt the mathematical knowledge points in his mind full of anticipation.

Now, with Yu Hua's mathematics level, taking the college entrance examination again, he is sure that his level in mathematics is at least about 90 points, and the fluctuation does not exceed five points.

Floating down one point less, you have to be anxious with the marking teacher.

Based on the current learning efficiency, I can review the main subject mathematics within a month, and physics, chemistry and biology will take about a month, and the Chinese language and party morality are a bit of a headache. Based on my traditional Chinese character level, it will take at least two months. English I also have to make schedules, and I also have to learn Japanese. A little more is a little bit.

In addition, Yu Qinghe's burial will be arranged.

Yu Hua pondered silently, got up and went to the stove, picked up a porcelain basin full of traditional Chinese medicine, poured it into a small bowl, and took another sip.

After drinking the medicine, Yu Hua prepared to go to bed to rest for a while, and then went to work on Yu Qinghe's funeral in the afternoon.

"Dong dong!" At this moment, there was a sudden knock on the door of the house.

"Anyone?" A small voice came.

(End of this chapter)