Chapter 20 Chapter 20 She Followed the Shadow
Xu Sui stood behind Xu Zhiyao, who was checking out. She lowered her eyes and looked distracted until Xu Zhiyao patted her shoulder.
"Why are you in a daze? Are you not feeling well?" Xu Zhiyao asked as he saw Xu Sui looking absent-minded.
Xu Sui pulled himself out of his own world and shook his head, "No."
"That's good. Let's go to the street on the left to eat Malatang. I've been craving their soup for a long time. I heard that their soup base is spicy and fragrant." Xu Zhiyao licked her lips as she spoke, holding Xu Sui's right hand and walked forward. Xu Sui took a plastic bag from her hand.
"By the way, why did you suddenly pull me away just now? We didn't do anything. Why were you so anxious? You made me think we did something shameful." Xu Zhiyao wiped his face. The end of his high ponytail brushed against Xu Sui's fair neck while he walked, making Xu Sui feel so itchy that he couldn't help but shrink.
"No, it seems like an hour has passed and I still need to eat. I'm afraid I won't have enough time." Xu Sui found a reasonable excuse and didn't plan to reveal his hidden thoughts to anyone for the time being.
At least until she caught up in his footsteps.
"So that's how it is." Xu Zhiyao jumped up and down, pulling Xu Sui forward. "Hurry up then! We have a listening test later. If we're late, the teacher will scold us."
Xu Sui's eyes fell on her back in white school uniform. The noise of the world was in her ears. She was pulled to quicken her pace. Xu Zhiyao led the way in front. In a trance, Xu Sui suddenly looked back.
A hazy white shadow appeared at the door of the bookstore they had just come out of. The features were unclear. There were also students wearing the uniform of the No. 1 school in the city in that bookstore, but for some reason, Xu Sui had a vague premonition in his heart.
Just when Xu Sui was about to turn around, the person standing there suddenly looked up in their direction. In fact, there were many people in their direction, and he might not be looking at them, but Xu Sui still quickly looked away.
"To thank you, Xu Xiaosui, for accompanying me on this incognito visit today, I'll pay for your dinner tonight!" Xu Zhiyao said this with such force that Xu Sui couldn't help but agree. The slight discomfort he had just felt was washed away: "Thank you."
**
The city's first-class exams are usually scheduled at the end of every month. Students will have a one-month holiday after the exams, and the results will be out when school starts. This arrangement has two advantages. First, it can serve as a spur, so that students can fully exert their strength after taking the exams in one go and then taking the holiday. Second, it can serve as a warning, so that students who did not perform well in the exams will work harder next month.
This time, the midterm examination of the No. 1 high school in the city is scheduled for the 30th. It is a joint examination with several schools in Chongqing and high schools in other provinces. Finally, the schools will be evaluated.
Nankai did not participate this time because they were on holiday at that time.
On the evening of the 29th, the entire first-year high school was brightly lit, and the corridors of West Building 1 and West Building 2 were filled with students.
Xu Sui sat in a chair and kept calculating on the draft paper, but the results she got were always inconsistent with the answers in the teaching aids. She didn't know which teaching aids it was. The analysis was a long one, but there was a step that Xu Sui didn't understand why it was omitted. The omitted part happened to be the one she didn't understand!
Thinking about the math test tomorrow, and not being able to find the solution to this problem, it is October, and I am wearing an autumn coat, but I can't stop sweating on my forehead.
The uncomfortable feeling in his heart made Xu Sui feel like a thorn in his throat. He put the pen on the table, let out a breath, blinked his sore eyes, and stared at the steps of solving the problem he had written in a daze.
That was the final question that examined functions and sequences in combination.
Xu Sui wondered what had happened to him today, choosing such a difficult problem. Wasn't this pure torture? It had ruined his mood, but he also felt that if he didn't do it today, he would have to tackle it another day. He couldn't just let it go forever. Just thinking about it made him feel annoyed.
Xu Sui rubbed his face and took off his open school uniform jacket because he was too hot. He looked up at the clock. It was ten o'clock in the evening and there was still half an hour before the get out of class was over.
Why not ask Jiang Changjia to solve it for me tomorrow morning, Xu Sui thought, but her obsessive-compulsive disorder made her keep thinking about it if she didn't solve the problem today. But she couldn't figure it out, and the feeling in her throat made her feel uncomfortable all over.
Xu Sui looked around and saw that there were not many people in Class 1. They were all discussing the topic outside. Zhao Jianhua was standing at the front door, with one foot inside the classroom and the other outside, his eyes shining as he scanned the surroundings.
I looked around but didn't see Jiang Changjia. It seemed that she was explaining a problem to her new deskmate outside.
Pinching the corner of his clothes with his fingers, Xu Sui slowly turned his body slightly, gritted his teeth, turned his head and said to Song Shiyang, who was standing behind him with one hand on his forehead and the other holding a pen, "Song Shiyang, can you explain this problem to me?"
Song Shiyang raised his eyes and his gaze fell on Xu Sui's face. His voice was hoarse from not speaking for a long time. He asked: "Which one?"
"Here." Xu Sui handed him the supplementary material he had been clutching in his right hand, his slender white index finger resting on the white paper. "I've been thinking about this comprehensive question about functions and sequences for a long time and haven't figured it out."
What I mean is that I didn't mean to disturb you or take up your time, I just really can't write anymore.
Song Shiyang's eyes followed Xu Sui's finger and stopped at where she was pointing.
"Given that the function f(x) is equal to (2 to the power of x minus 1) divided by (2 to the power of x plus 1), the sequence xx satisfies the first term xx...
Prove that "sequence xx divided by xx" is a geometric sequence, and find the general formula for the sequence xx.
Song Shiyang quickly scanned the problem, the solution forming in his mind. He looked up at Zhao Jianhua standing at the door and the few classmates in the classroom who were still working on their homework. He tilted his chin outside and said, "Let's talk outside?"
"Oh, okay." After Xu Sui finished speaking, he stood up with him. The two of them walked outside and found that there was not much space left for them to discuss the topic.
"Sui Sui, you're out too." Jiang Changjia took the opportunity to pinch her face when passing behind her, and then noticed Song Shiyang beside her. He raised his eyebrows in surprise, licked his lips, and whispered in her ear: "Oh my god, why did you call this immortal out? He used to drive those two old men crazy when he was explaining the questions to Jiang Song and Xie Zhuoyuan. He looked at you with an expressionless face and scared you to death. Why didn't you come out to find me..."
"Jiang Changjia." A low, flat voice called out, carrying a sense of calm threat.
Jiang Changjia quickly covered his mouth and turned around.
Xu Sui opened his mouth and followed the tall figure in front of him. For a moment, he doubted whether his approach was correct. Forget it, it didn't matter, as long as he could figure out the problem.
The white porcelain walls of the corridor and the windowsill were all covered with people. Finally, Song Shiyang found a place in the corridor between West Building 1 and West Building 2. He stood there and turned around, looking at Xu Sui who was lagging behind. He didn't urge him, but just habitually supported himself on the porcelain windowsill with one hand.
The connection between the two buildings was not as bright as the corridor. The light was yellowish, not so glaring white. There should be people studying at the other end, because Xu Sui heard faint voices.
Noticing Song Shiyang's gaze, Xu Sui lowered his head, curled his fingers, and clenched them in the quiet yet noisy air, then quickened his pace.
"Show me the solution process." He lowered his eyes and looked at Xu Sui's right hand holding the draft paper, teaching aids and pen.
Xu Sui took a deep breath and walked closer, closer to the porcelain stone windowsill and closer to the moonlight, and placed everything in his hands outside the window.
As Song Shiyang lowered his head to examine it carefully, Xu Sui puffed out his cheeks, exhaled, and then calmed down and looked up at Song Shiyang. Then, he tapped a slender finger on a certain spot on the draft paper and said, "Here, it said to use algebraic transformation. I changed it, but the result is different from what it gave."
The girl's voice trembled slightly. She tried her best to maintain her normal tone and voice, and pointed out her doubts in an extremely calm manner.
Song Shiyang heard her words and followed her finger down, writing a long line in the draft book. This was the final math question in last year's joint entrance examination. The number sequence given was strange and complicated, and the function was different from the usual practice. It was full of challenges and traps.
Song Shiyang took the pen and prepared to write on the empty space in Xu Sui's draft book. Before writing, he casually asked, "Can you write?"
"able."
"You substituted the number sequence given in the question into f(x) and got this formula, right?" Song Shiyang tilted his head to look into Xu Sui's eyes.
"Yes, that's right." At this moment, Xu Sui's mind was only focused on the math problem, and he followed Song Shiyang's ideas seriously.
"Use Cn to represent this formula, and we get Cn+1. Take the logarithm of both sides. The common ratio of a geometric sequence is multiplication, which is an exponent here, so {lnbn} is a geometric sequence. Now you can perform algebraic calculations." Xu Sui listened carefully. Song Shiyang's tone was not fast, but not slow either. He wrote down several formulas in Xu Sui's notebook with great vigor and enthusiasm, and then handed the pen to her.
He did not tell her the answer directly, but half of it and left the other half. When Xu Sui saw Song Shiyang write down the long and boring formula that looked like a foot wrap, she almost understood what she had not figured out. She had used the wrong algebra, did not convert correctly, and mixed up the concepts.
Xu Sui nodded and took the pen from him. The pen tip trembled slightly, and the law of the function was found in one formula and number after another.
Perhaps it was because he was afraid that he would not be able to do it and be disliked by him, Xu Sui felt that his potential was stimulated that day. He wrote out all the processes of the second part in just one or two minutes. He lowered his head and glanced at the second question. He actually had an idea. He was so happy that he smiled and raised his lips slightly.
Song Shiyang looked at the girl in front of him who suddenly became happy for some unknown reason. He raised his eyebrows slightly, lowered his eyes and glanced at her roughly, then casually praised: "Okay, you get it right away."
Like a teacher, express your recognition to your students.
Xu Sui bent his eyes and looked at him, and said softly: "Thank you, Song Shiyang."
"It's nothing, just my job. Let's go back to the classroom." After saying that, she raised her hand to grab the loose hair on her forehead and walked towards the other end of the classroom. Xu Sui looked up at the high moon, put away her things and followed Song Shiyang. Even though he walked quite far, his shadow was lengthened by the light, and she followed behind the shadow.
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