let loose

“设两平行截面半径分别为r1和r2……按照题意来看，πr12等于5π，πr22等于5π，因为OA1和OA2都是球的半径R，所以……”

The last class in the morning was mathematics. Lin Guang brushed and sharpened the chalk, and held up a settable to compare pictures from time to time.The students below looked up and took notes quickly. Occasionally, one or two failed to save themselves, so they could only scratch their pens, staring at the letters on the blackboard and doubting their lives.

The tip of the pen drew two random strokes on the draft paper, and a π character was drawn into a convex character in three or two strokes. Song Mian glanced at the time boredly. It was just 11:53, and get out of class was over in 7 minutes.

"Take notes."

His head was racing around, when suddenly the back of his hand was tapped by the round tip of the pen.

"what?"

It doesn't hurt, it's just too sudden.Song Mian turned her head in bewilderment.

"You promised to take notes for me." Jiang Zhou straightened his shoulders and continued to work on his own topic, only moving his lips, "I didn't listen to this class, and I will make up for it after class with your notes."

Saying that, he put down the pen, slid his hand under the table and grasped Song Mian's wrist deliberately, his eyes glanced at the clean notebook on Song Mian's desk, and frowned, "You just memorized two lines of formulas?"

"It's not something that I've just mentioned before. The solid geometry of the fourth course is the key point of the college entrance examination, and it accounts for a large proportion of the score. Song Mian, didn't you promise to take notes in the lectures and give me extra lessons?"

"Remember~"

The wrist was pinched so painfully, Song Mian struggled but couldn't get away, so she had to beg for mercy: "I was wrong, I was wrong! Write it down immediately!"

"Brother~ I hurt~"

Duoduo, the front desk king, bent Song Mian's desk twice, turned his head a little bit and exposed half of his ear, and whispered, "Pu chi! Squad leader! Old Lin's eyes!"

The class fell silent at some point, and dozens of heads in the class turned around to watch curiously.

"..."

Jiang Zhou let go of his hand immediately, ignoring Wang Duoduo's words, and raised his chin lightly at the notebook.Song Mian shrank her neck, didn't look at Jiang Zhou or Lin Guang, and obediently memorized the notes.

"cough."

Lin Guang glared at Song Mian, turned his gaze back and tapped the blackboard twice, signaling the students to concentrate, "The upper two points are because of the lower point, and the opposite is why, engrave it in my mind and remember it! The knowledge learned in junior high school , the most basic common sense in geometry, some people still make mistakes in the second year of high school, and there are more than one!"

Then he threw the end of the chalk in his hand towards the dozing students in the last row. "It's you, Zheng Qiran, are you unable to open your eyes?"

This piece of chalk was hit so cleverly that three heads popped up in the back row.Lin Pingping, who was gouging out his eyes and giggling, Zheng Qiran scratched the back of his head depressedly, and smiled awkwardly: "Open your eyes, open your eyes, teacher, please continue, I will listen carefully."

"You better be."

林光重新掰了截粉笔头，拿起三角板，指着黑板上的图形：“R2-5-R2-6=1，解得R2等于9，所以R等于3，由此可得：S球=4πR2=36π……”

Ever since he got the last place in mathematics in the sixth class of the half-term exam, Lin Guang has been completely blackened. He has lost his original good temper, and the classroom discipline has become more serious.

There are only a few months left until the end of the term, and the learning atmosphere in the class is much more rigorous than half the term.The teaching process of key high schools is usually very fast, just like Class [-]. When the second year of senior high school is in progress, the compulsory courses for the second year of high school have already learned the second half of the unit. .

The second year of high school is relatively easy, but the third half of the high school in the complex building has already entered the review stage, with remedial classes every week until Saturday afternoon, evening self-study is basically used for competition questions or quizzes, one test in two days, one test in three days, one test in three days It is commonplace.

"Write after thinking about it." Jiang Zhou was dissatisfied with Song Mian's perfunctory appearance in order to complete the task. He tapped the back of his hand with the tip of his pen and said in a low voice: "Don't look at each letter and write it down. Use. Go through the formula completely in your head, and then write it out silently.”

Song Mian said "Hmm" in embarrassment, and insisted on copying the last root number 2 while watching, "I can't remember it silently."

As a traditional scumbag who has spent many years, I am used to getting along in my daily life. Mathematical formulas are dazzling just by looking at them, let alone dictation?

Accustomed to a rascal moaning innocently, Jiang Zhou kept writing with his hands, without giving him a look.

"I can't recite it, I can't recite it! I can't remember it!"

Song Mian sneaked a glance at Jiang Zhou, and quietly looked at the blackboard, "Just copy two questions, I've sent a grievance card."

"Brother! Look at my Kazilan's big eyes, aren't you sincere enough? Can't you arouse your love and affection?"

Jiang Zhou was laughed at by Kazilan's big eyes, but he held back.With a cold face, he exchanged pens with Song Mian, and said, "If you can't remember, just read it twice. Boyfriend buff, come on."

Song Mian went crazy: "...I want the buff of love, you can just kiss me, don't want this! Wrong card! Wrong..."

Before a certain Kazilan's big-eyed scumbag could finish her grievances, a piece of chalk flew towards the center of her forehead, and Lin Guangyou said, "Song Mian, stand up and listen to the class."

……

The cafeteria at noon was crowded and noisy as usual.

The cafeteria of this school is amazing, obviously there are only so many people, and many people left after eating, talking and laughing, but as long as it is meal time, there is always a long queue waiting for the meal.

This also means that the tables in the cafeteria are "full" most of the time.Zheng Qiran is usually responsible for occupying the seat. This guy runs fast, has a thick skin, and can withstand all the pressure of sight. Whether it is a girl or a junior who comes to grab it, he treats them equally and never relents. He never leaves the seat.

Song Mian sat down opposite Jiang Zhou, Zheng Qiran and the others were not surprised by this, and every time they ate, they consciously vacated the opposite seat for them.

"How long is New Year's Day off?" Zheng Qiran took a mouthful of rice and muttered, "Is the number two on holiday?"

"What's wrong?" Chu Qing asked.

In the past few days, Chu Qingci's condition has improved a lot, and the communication with Chu Xiaonan has also become normal, and he is no longer ignorant like before.Just keep silent about Chu Xiaonan's remarriage.

Song Mian and Zheng Qiran didn't take the initiative to mention it, and everyone appeared to be in peace.

"Speed ​​Youth Competition!" Zheng Qiran became excited, "It's the top ten in the region. You can go to the Speed ​​headquarters to visit! No. 15 registration, the competition will start on the [-]nd, our group will register a name, team competition, couple competition, can enter the first round A group is a group!"

"The top ten in the region?" Song Mian swallowed a mouthful and frowned, "Does the country divide into east and west districts or Shanghai and Shanghai?"

Judging from Calabash Little King Kong's semi-defeated record of ten games and four defeats, the top ten teams in Shanghai and Shanghai can barely be expected.