Do you understand Euclid today?

In examination room No. [-], only the first seat in the first row was left. Lin Qianshu walked into the examination room, sat straight on the seat, and looked up at the invigilator.

The teacher who invigilated the examination entered Nanshi Gao after Lin Qianshu graduated. Lin Qianshu didn't know him, but he probably knew Lin Qianshu. When he saw Lin Qianshu looking at him, he smiled friendly at Lin Qianshu laugh.

... You don't have to smile so kindly.

Lin Qianshu looked away, and lowered his head with a guilty conscience.

When the preparatory bell for the exam rang, Lin Qianshu's whole body shivered. He belatedly realized that sitting in the monthly exam room of the third year of senior high school at his level, not only could he be called a newborn calf not afraid of tigers, but he could even praise an artist. Tall people are bold.

No, no, don't be so pessimistic.Lin Qianshu took a deep breath, and tried to comfort himself: The protagonist in the novel usually gains a few gold fingers after time travel, such as having a photographic memory, writing a pen and so on. At least he has already got the script of the protagonist, at least one of them will always come. right?

Thinking of this, Lin Qianshu took the papers handed over by the invigilator calmly, took one from the top with great skill, and blindly put the rest of the papers on the table behind him, his eyes were already busy reading The topic on the paper.

Known set M={x|-5
Looking at it one by one, three minutes later, Lin Qianshu's mood fluctuated again.

He thought that there was a high probability that he had taken a fake time-traveling script—the miracle he imagined did not happen, and this script was like a heavenly book in his eyes.

What's the point of wearing this, it's so lonely.Lin Qianshu stared at the paper for a while, and the dense numbers gradually became distorted before his eyes. He looked at them for a while, and these numbers made his eyelids twitch, and unconsciously let go of the hand holding the pen. It also fell down.

Just as Lin Qianshu's head was about to be buried on the table, he suddenly felt someone poke his back, which almost made him cry out.

Lin Qianshu straightened up suddenly, and while the invigilator was not paying attention, he quickly turned his head and gave the troublemaker in the back row a look, trying to condemn his immoral behavior with his eyes.

As a result, Lin Qianshu was almost sent away by the second shock today.

Sitting behind him is also a young man in a sports sweater. The young man's appearance is handsome, with sword eyebrows and starry eyes, and a tough outline. The black clothes make him even more cool and cool.

But the handsomeness of the young man was not the main reason for Lin Qianshu's mood swings.The young man is very handsome, but if he replaces his sweater with a school uniform, with shorter hair and a thinner figure, Lin Qianshu will be very familiar with him—who can tell him why his high school rival Jiang Yizhi Will it be in this examination room? !

Perhaps the panic in Lin Qianshu's eyes was too obvious, and Jiang Yizhi's eyes were a little more confused.He tapped the paper with a pen, and reminded Lin Qianshu in a low voice, "Read the paper and concentrate on the questions."

How could someone like Jiang Yizhi remind himself to concentrate on the questions?Lin Qianshu thought, "Sure enough, this is the world of time travel?" He sincerely shook his head at his former rival before time travel, and replied with his mouth: "I won't do it." He paused, jokingly Said: "Why don't you borrow me to copy?"

Jiang Yizhi frowned slightly, and suddenly reached out to Lin Qianshu's forehead.

The defenseless Lin Qianshu was caught by him, and he almost jumped up and shouted "What are you doing?"However, as a qualified contemporary youth, Lin Qianshu knew that this was in the examination room and he shouldn't shout.

Jiang Yizhi touched his head for a while, then withdrew his hand to touch his own head, and said, "It's a little hot."Then, Lin Qianshu saw that the invigilator had reached the end of the classroom and was about to turn around. The basic experience gained in his years of student life made him turn back immediately, picked up a pen and pretended to be thinking hard about a trigonometric function problem stand up.

It is impossible to think of it.Lin Qianshu read the title several times with his eyes wide open, his head began to dizzy again, and he unconsciously began to complain about the "self" before he was time-traveled.

As a scumbag who won the title of star who failed mathematics many times in the monthly exam, Lin Qianshu couldn't understand why he chose to go back to high school to be a mathematics teacher after graduating from university, and even served as a member of the mathematics competition team for the first year of high school. Tutor, is this the power of the God of Time Traveling?

It's a pity that the God of time travel didn't take care of Xiaolin, who was in the first year of high school. He is still the poor little guy who scored 40 in the math test and didn't know anything.

Just as Lin Qianshu was immersed in incompetent grief, he heard a faint "click" coming from his feet. He subconsciously looked down and saw a small ball of paper rolled down to his heel .

Lin Qianshu felt his back being poked again, and Jiang Yizhi behind him seemed to be reminding him to look down.

Lin Qianshu bent down and picked up the ball of paper thrown by Jiang Yizhi. He wanted to put it on Jiang Yizhi's table, but his hand fell to the corner of the table and was gently pushed back.

Could this be a little note he wrote to himself?Feeling puzzled, Lin Qianshu unfolded the ball of paper and smoothed it out, only to see that it read: "ACCBADBACA, 1,0
Lin Qianshu soon realized that what Jiang Yizhi passed on to him was exactly what he did!

The space of the note is limited, except for the multiple choice questions and fill in the blank questions, Jiang Yizhi simply wrote the final answer of each question for the remaining short answer questions.Even so, Lin Qianshu still had a sense of unreality that the world was truly magical.

The rival in high school passed the answer to himself in the examination room after a lapse of seven years.

The world is crazy.

In fact, it was Lin Qianshu's own tricks to regard Jiang Yizhi as his deadly enemy. Lin Qianshu even suspected that Jiang Yizhi didn't know that he hated him.

The grievances between the two can be traced back to the beginning of high school exams.

The start-of-term exam was held in a class where the seats were disrupted, and the two of them happened to be arranged at the front and back desks just like today.It's just that Lin Qianshu is at the back and Jiang Yizhi is at the front.

Mathematics has always been Lin Qianshu's weakness. In order to cope with the high school entrance examination, he even memorized many classic question types by rote. As a result, Ouhuang Wuxing Xiaolin found that he had memorized all the questions after opening the high school examination paper. By coincidence, he was not only admitted to the city's key Nanhuai Experimental High School, but was even assigned to Class A, where the strong are like forests.

After receiving the admission notice from Nanshi Gao, Lin Qianshu immediately entered the carnival mode. It was not until the last day when he checked the information on the registration form that he found that there was a line of fly-sized words at the bottom that said "the registration day will hold a test for the start of school." .

Lin Qianshu, who had been playing like crazy for a summer vacation, was holding the registration form and started to panic - after playing like crazy for a summer vacation, he had already forgotten all the knowledge points in junior high school.

Is he going to be at the bottom of the class as soon as school starts?Lin Qianshu thought anxiously.

With anxiety in mind, the next day Lin Qianshu walked into the examination room and began to find out the details of other people.He first asked the boy on the right who was whistling and spinning his pen: "Brother, how are you doing math?"

"Me?" The boy stopped whistling, pointed to his nose, and then raised his hand confidently, "It's not bad, I'm nicknamed 'Little Prince of Mathematics' from junior high school."

Seems like a genius.Lin Qianshu sighed, and asked the classmate on the left: "Brother, how are you doing in math?"

The glasses sitting on the left are as thick as the cap of a beer bottle. He pushed the glasses and said in a gentle manner: "I used to be not very good, but I have been in the improvement class for two months this holiday. This time I plan to come Measure the progress of the summer vacation."

Come on, the day after tomorrow hard-working academic master.Lin Qianshu sighed again. Sitting between the two of them, he felt a deep sense of inferiority.

Lin Qianshu pinned his last hope on the boy in the front row who hadn't participated in the discussion.He took a deep breath and poked the back of the boy in front of him with the cap of his pen.

The boy turned his head and looked at Lin Qianshu without emotion.The eyes of the two met in the air, and Lin Qianshu shivered from the cold.

"Uh...student," Lin Qianshu smiled at the boy awkwardly, trying to relieve the awkward atmosphere between the two of them, "...how are you doing in math?"

The boy stared at Lin Qianshu for a while, then said "average", and quickly turned back.

Although the boy's attitude was not very good, this sentence of "average" gave Lin Qianshu hope.The mathematics grade I most often obtained in the third grade of junior high school was also "average". It seems that this boy is not the same as myself.

Maybe he wants to save face and doesn't want others to see his fragility.Lin Qianshu relaxed a little. After the test papers were sent out, whenever he encountered a question that he couldn't do, he would always raise his head to look at the boy in front of him. My heart is filled with infinite sympathy and motivation...

When the bell rang at the end of the exam, Lin Qianshu wrote the word "solution" under the last short-answer question with a sacred heart, put down his pen devoutly, and got up and left the table under the command of the teacher.

Before leaving, Lin Qianshu quickly glanced at the papers of the boys in front of him, and found that his papers were exactly the same as his own, and they were all extremely clean.Occasionally, there are scratches on my own paper that I pretended to have read the questions seriously, and the boy only has one answer for the choice and filling in the blanks, and there are only a few lines of words under the short answer questions, which seems unreliable.

It seems that he is a classmate with average grades.Seeing that the boy also stood up, Lin Qianshu gave him a friendly smile.

The boy seemed a little surprised by Lin Qianshu's smiling face. After being stunned for a few seconds, he nodded at Lin Qianshu, grabbed the pen and eraser and quickly left the examination room.

Lin Qianshu also packed up his stationery, walked to the boy's desk and glanced at the candidates' information in the upper right corner.

Jiang Yizhi, Class A, Senior One.

Jiang, Yi, Zhi.Lin Qianshu silently said the boy's name several times in his heart, recalled his pretty face, and matched the name with his face.

Lin Qianshu decided to take this classmate Jiang as a confidant, so that he would have a guiding light on the road of mathematics confusion in the next three years.

The author has something to say: In Lin Qianshu's eyes, Jiang Yizhi, a freshman in high school: the enemy!

In Jiang Yizhi's eyes, Lin Qianshu, a freshman in high school: Who is it?