Alchemy Principles of Type-Moon World

——There was a monster sitting in front of him.

Xing Qingqi's back was to the window. The sunlight from outside filtered through the gaps in the curtains, creating several soft rays of light that illuminated the objects around him: the luxurious bookshelves, the neatly arranged notebooks, the test papers piled on the desk, and the small wine flask he had casually set aside. However, the light seemed unable to illuminate Xing Qingqi's face.

——His calm and stern face was now obscured by shadows, and only his well-defined chin and slightly tense shoulders could be seen.

Flat's vision has allowed him to see "something" that others cannot see since he was a child. It is not a talent like the magic eye, but a talent brought about by the activation of something engraved in the magic mark.

At this moment, Flatt felt that the man sitting in front of him was far more dangerous than anything he had seen in the past ten years.

O... Order Xing, I... I have something else to do. Um, I'd like to ask for leave..." Flatt's words were a little halting. He swallowed hard, trying to make his voice sound steady. "Oh, it's just, uh, something happened at home, like my sister's wedding or something. If there's anything else, can we talk about it next time?"

"Now that we're here." Just as Flatt's heartbeat quickened and he was about to turn and flee, Xing Qingqiu's low and calm voice suddenly rang out, seemingly devoid of emotion, steady and unyielding. "Why are you leaving in such a hurry?"

Flatt stopped abruptly, his heart in a panic, almost wanting to grab the door handle, but at the moment he hesitated——

Click——

The door behind him seemed to be gently closed by an invisible force. The crisp sound of the door locking seemed to seal off all space. The air seemed to grow heavy in an instant, even breathing became difficult. Flatt's footsteps suddenly became heavier. He subconsciously turned around, only to see Xing Qingyu still with his back to him, his figure casting a long shadow behind the curtains.

"Okay, let's take a look at your paper." Xing Qingyu continued, his tone still so calm and composed, but it contained a chilling sense of oppression.

A sudden chill ran down Flatt's spine. He instinctively wanted to flee—but his body refused to obey his will. Every step seemed to be restrained by some force, and he inadvertently moved in the direction of Xing Qingjiu. His eyes began to panic, and he kept repeating calming words in his mind.

"Damn it... 'Play Ball!'" Flat gritted his teeth, mentally activating his own magic, rapidly analyzing the surrounding magical field, attempting to identify the technique Xing Qingjiu had used. With his mind racing, he diligently mobilized his own magical power, his gaze swiftly sweeping across the air, keenly capturing every subtle fluctuation of magical energy.

However, the problem arises——

He found himself unable to understand the workings of Xing Qingjiu's magic. Even the flow of the surrounding magical field was so complex that it completely overloaded his brain. Fine beads of sweat formed on Flat's forehead. He could barely breathe. The air around him seemed to grow thicker and thicker, as if an invisible force was oppressing his every movement.

"Damn it... Order Xing, what the hell are you using?!"

"As a magician, isn't it natural to encrypt your spells?" Xing Qingfeng continued leisurely. "I simply created a slight local pressure difference to push you towards me—"

Flatt's body still couldn't control itself and approached Xing Qingjiu's table, while Xing Qingjiu's calm voice continued to sound:

"—It's just a slight cover-up of the flow of magic power. Can't you see that? Well, regular magicians wouldn't cover up to this extent, and they can't do such a detailed job," Xing Qingqi said with a smile. "But if you were good at math, you would have seen through the pattern and broken free by now."

"Ah, yes, speaking of mathematics," Xing Qingqi put his hand directly on the top of Flat's head and grabbed -

"—Come show us your math test."

At this moment, in a classroom dozens of meters away, students who were worried about their math grades suddenly heard screams coming from the office.

"—I was wrong, I was really wrong!!" Flatt's scream echoed throughout the El-Melloi classroom, his voice filled with despair, "I won't dare to do that again!!!"

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Originally, the title of this chapter was to start: The Power of Calculation, Grade 3 of Junior High School (

But after thinking about it, I feel that this title is more suitable. Although the plot needs to be accelerated, I also want to change the method to give you interesting content. I will probably focus on teaching for several chapters.

The above is a new book by a new author. Please vote and give me feedback. Thank you!

Volume 48: Xing Qingfeng's Perfect Arithmetic Classroom: . Interest in mathematics is more important than mathematical thinking

As the bell rang, the classroom gradually quieted down, and the students gathered their books, preparing to start a new class. Normally, Xing Qingyu would always arrive at the classroom door punctually, just as the bell rang, but today, he was a step behind schedule.

As the bell echoed around the classroom walls, Xing Qingyu's footsteps could be heard slowly and steadily. The sound was not loud, but it seemed to leave a heavy atmosphere in the air. The classroom door suddenly opened, and Xing Qingyu's figure appeared at the door, followed by an inexplicable sense of oppression.

Under Xing Qingyu's right hand, Flatt was mercilessly dragged into the classroom. His body limp, like a heavy corpse, completely unable to move. Xing Qingyu grabbed Flatt's head with one hand and dragged him into the classroom with an expressionless face. Flatt's steps were like those of a mindless zombie, completely unable to control himself.

When the students in the classroom saw this scene, they stopped what they were doing and their eyes all fell on Xing Qingyu and Flatt.

Xing Qingqiu placed Flatt in his seat, but Flatt's body collapsed after hitting the table, like a cooked noodle, and his face slammed unceremoniously on the desk. Xing Qingqiu grabbed Flatt's back several times, trying to help him up, but found that the guy didn't respond at all. Finally, he could only give up helplessly and let Flatt continue in this position.

With a wave of his hand, the stack of test papers in his hand flew accurately to each student's desk. The papers drew arcs in the air and finally landed accurately in front of each student.

"I'll give you five minutes to review your exam questions. Later, this class will be divided into two parts. In the first half, I'll discuss this exam and your upcoming math schedule. In the second half, we'll continue with our normal teaching." Xing Qingqiu walked to the podium, his voice calm. He began to organize his lesson plan and copied the questions from the exam onto the blackboard, his chalk leaving clear marks on the surface.

The classroom was nearly silent, save for the scraping of pens on paper. The students looked down at their papers, their expressions varying. Some were already trying to review their mistakes, while others seemed uneasy, a hint of uncertainty playing around their lips.

"Does it seem like Teacher Xing isn't in such a bad mood?" A student whispered to the classmate sitting next to him, with a hint of tentativeness in his murmur.

"Huh? You mean... Teacher Xing is in a good mood?" The student was obviously a little surprised. He looked at Xing Qingqiu and felt that there didn't seem to be much anger in Xing Qingqiu's expression. "Maybe Flatt has taken most of the responsibility for everyone."

"That's true..." The student glanced at Flatt, who was still slumped on the table, his eyes filled with gratitude and pity. "I will cheer you up in my heart, Master Flatt. I'm so touched that you're willing to make such a sacrifice for us..."

"No, you're just attracted by his face," another student sighed, his eyes unconsciously flicking to Flatt, who was still slumped over the table. "You're so touched, you're such a face-obsessed person, there's really no hope for you."

"I just prefer someone who's a little more mature and reliable. Besides, Mr. Xing is only in his early thirties, so he's not an uncle at all!

Xing Qingyu listened carefully to the whispers of the students in the audience.

He always felt that at this time he should say something like, "If they put their minds to studying, it would be fine." But he also felt that it would be strange to respond to such a question. Maybe something more troublesome would happen, which would make their minds completely wander. His eyes were still focused on the lesson plan on the podium, concentrating on the next teaching plan. He sighed silently in his heart, but his mind quietly turned to another thing -

"--Alas..." Xing Qingyu thought to himself, writing on the blackboard with his back to the students, "Have I reached the point where I'm considered an uncle?"

Xing Qingfeng's eyes fell on the writing on the blackboard. His fingers gently slid across the writing on the blackboard, and his mind once again fell into thinking about his students. Although their math foundation was not solid, many students had a shallow grasp of the knowledge and even had problems with the simplest four arithmetic operations -

——But at least they are still willing to learn. So far, no students have questioned what is the point of Xing Qingjiu learning these things. This is a good thing.

Even as he was immersed in his own thoughts, the students' discussions were still quietly circulating in the classroom.

"——I got three questions wrong this time. How about you?" A student looked down at his test paper and asked the classmate next to him anxiously.

"Ah...it's three times my score?" another student sighed helplessly. "Damn it, I lost."

Xing Qingqi's ears moved slightly. Although he didn't turn around, he could still clearly hear the students' worries and nervousness from their conversation.

"...Not bad." Xing Qingyu nodded slightly, as if he was satisfied with his writing on the blackboard.

——He practiced for a long time before changing his original cursive style.

Then, he turned around, still without rushing to speak, but leaned forward slightly and cast his eyes on the test paper in front of the podium.

Xing Qingyu gently tapped the podium. The crisp sound shattered the silence, bringing a deep yet commanding force to the classroom, instantly drawing the students' attention back to the classroom. The faint whispers and murmurs in the classroom quickly faded, and everyone turned their heads, their eyes fixed on Xing Qingyu.

"Students, get ready for class." Xing Qingqiu glanced down at the test paper in his hand, then raised his eyes and continued, "Some of you may be wondering why I have to make you study math."

The atmosphere in the classroom was still quiet, but the students' slightly tilted bodies and subtle movements revealed their curiosity.

Xing Qingyu paused for a moment, then drew a simple straight line on the blackboard. He then drew several quadrilaterals of different shapes around the line.

"We all know that the formula for the area of a rectangle is the long side multiplied by the short side," Xing Qingfeng said calmly. "So, let's assume the perimeter of the rectangle remains unchanged—"

"--that is, if the sum of the length and width remains unchanged, how should we distribute the length and width to maximize its area?"

Although this question is quite simple, so simple that it is common sense——

——But the students in the audience remained silent for a moment!

Xing Qingyu stood there patiently, his eyes briefly scanning each table until finally a student raised his hand.

"Uh, 1 to 0.618?" The student raised his hand cautiously, a hint of tentativeness in his eyes. "I remember this ratio being very famous. My friends at the Institute of Creation often mentioned it to me..."

Xing Qingqiu's eyes flickered slightly, and he nodded, giving the other person some affirmative look, but his tone remained steady: "Excellent answer, which shows that you are paying attention to these things." He paused, then slowly said, "But, unfortunately, the answer is wrong."

A hint of embarrassment appeared on the student's face, however, he did not seem discouraged.

"It's okay. Getting the answer wrong isn't a big deal," Xing Qingfeng continued to guide him calmly, stuffing him with a mouthful of chicken soup. "Mathematics is about finding the correct answer through constant verification and reasoning. Compared to giving the correct answer, the courage to give the answer is what's more important."

Xing Qingfeng casually wrote down different side lengths and area values under the rectangles on the blackboard, pointed at the number series, and continued asking, "Can we see any pattern?"

"What is it, exactly? Suppose the sum is 10. Is it 3 times 7, or 4 times 6?" Xing Qingfeng wrote the corresponding side lengths and areas beneath the rectangles on the blackboard, forming a sequence. Pointing to the sequence for the areas, he asked the students, "Can we see any pattern?"

"It seems... the closer the length and width are, the larger the area!" Some students below quickly reacted. It would be better to say that they had guessed the answer when they saw Xing Qingyu draw these rectangles, but Xing Qingyu was concentrating on finishing writing on the blackboard, so they were just waiting for Xing Qingyu to ask them.

Xing Qingqi's eyes gleamed with satisfaction. He nodded gently, his tone encouraging, "Very good, that's exactly right. When a rectangle's area is maximized, its length and width should be as close as possible. This is also a very basic rule in mathematics—"

"—And what further conclusions can we draw?"

He raised his chin slightly and scanned the class, catching the students' slightly bewildered expressions, their eyes tinged with puzzlement. His tone was calm, as if he had anticipated the next reaction, remaining calm and composed. "Can we say that when two numbers have the same sum, the smaller the absolute value of their difference, the greater their product?"

After this sentence was spoken, there was silence in the classroom for a moment.

Xing Qingyu paused briefly, watching the students' reactions, narrowing his eyes slightly. He realized that he might have expressed this conclusion in an overly complicated way. So, he stretched out his hand, rubbed his temple, and sighed softly.

"Simply put, the closer two numbers are, the greater their product will be."

The students finally reacted, their eyes lit up with sudden enlightenment. Xing Qingqiu then turned his attention to a more important question: "So, how does this conclusion apply to our magic?"

As soon as he finished speaking, the classroom fell silent. The students' gazes were fixed on him, their ears filled with only their own breathing and the gentle rustling of pens. Every word Xing Qingfeng spoke struck a chord with the students, exerting an invisible pull that drew their attention completely to the lesson's content.

"In some techniques, there's a process of cumulative or multiplicative effects, right?" Xing Qingqiu continued, his tone guiding her. "For example, in the most basic Yin-Fu bomb variant, stacking two Yin-Fu bombs together creates a multiplicative effect—"

He paused for a moment, as if awaiting the students' response. The atmosphere in the classroom suddenly grew solemn, everyone silently calculating and deducing. He continued with an almost palpable focus: "--And if we precisely control the output of these two Yin-Huo bombs, making them as equal as possible, then the combined efficiency will be maximized."

As he finished speaking, a soft murmur filled the classroom, as some students began to piece together the information in their minds. A student in the front row suddenly raised his hand, eagerly responding, "Oh, Teacher, this is what's called synchronization, right? The closer the two magic tricks are, the greater the combined effect."

Xing Qingyu nodded slightly, with obvious approval flashing in his eyes.

"Yes, you can understand it that way." His tone wasn't at all urgent, but rather gently guided the students to a deeper understanding. "When the total amount of magic power we can output is the same, the higher the magic power utilization rate, the stronger its effect. This conclusion will undoubtedly help us improve our magic power utilization rate."

"This is an example of how basic mathematics is applied to magic." He scanned the classroom, his gaze resting on each student. After a pause, he continued, "We know that the essence of magic is the imitation or replacement of natural phenomena. We learn the mysteries, practice the mysteries, and reproduce the mysteries, but we cannot create the mysteries themselves—"

“—And mathematics itself is the best tool for summarizing and generalizing natural phenomena. It also originates from our understanding of the natural world and the result of its abstraction.”

The classroom fell silent for a moment as all the students silently digested Xing Qingjiu's words. Sunlight filtered through the gaps in the curtains and fell onto the tabletops. The faint light and shadows swayed gently with the flow of air, as if time itself had slowed down.

Xing Qingyu didn't immediately break the silence, but gave the students some time to digest it. The air seemed to freeze at that moment, even the sound of the wind outside the classroom became faint. Everyone's attention was focused on Xing Qingyu and the vision he described.

"From this perspective, mathematics and magic are actually somewhat related." Xing Qing's voice sounded again. He turned slightly, his fingers lightly touching the edge of the podium, as if waiting for the students' reaction.

Xing Qingfeng sighed. He felt like a kindergarten teacher who forced students to be interested in learning. He connected the knowledge to be learned with things that might interest the children in their lives, guiding them to naturally develop an interest in the knowledge.

——But judging from the results, the students below really buy into it.

"But we have to admit one thing," Xing Qingfeng continued, his tone unchanged, still that calm and patient one. "In terms of summarizing and generalizing natural phenomena, mathematics has actually far surpassed magic and the mystical."

"This isn't just because traditional magic is inherently closed," Xing Qingfeng didn't wait long before continuing his explanation. "It's also because mathematics and even the scientific system itself pursue the analysis of natural phenomena, rather than simply imitating and reproducing them—"

“——It is this constant exploration and analysis that has given mathematics its unique status as a tool.”

"That's why we need to learn this," he continued. "A deeper understanding of natural phenomena will make it easier for us to imitate them, which means we can improve on the path of magic—"

His words slowly spread in the classroom, and the students began to lower their heads and think silently. The fact that they would think about these words was a good sign in itself.

"—and mathematics can help us do this better."

Xing Qingfeng glanced at the students in the audience and nodded slightly with satisfaction. Although his description of mathematics would only make his university math teacher sigh and say that he lacked mathematical thinking—

"But the most important thing right now isn't mathematical thinking, but developing an interest in mathematics itself." Xing Qing thought silently, if there's no interest in mathematics itself, then mathematical thinking is of no use.

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I feel like there is a lack of two-way communication, but this chapter mainly involves Xing explaining the knowledge to the students unilaterally. There will probably be some differences in ideas in the second half of the class.

The above is a new book by a new author. Please vote and give me feedback. Thank you!

Volume 49: Xing Qingjiu's Perfect Arithmetic Classroom: . Wall Clock Flat

Xing Qingyu forcefully erased his writing on the blackboard, and the string of numbers and rectangles quickly vanished from the clean surface. The act of wiping the blackboard didn't disrupt the pervasive silence in the classroom; the students seemed to be silently awaiting the next lecture. Xing Qingyu paused, glanced up at the students standing at the podium, took a deep breath, puffed away a mouthful of chalk dust, and then walked over to the desks.

"Then there's your lack of numerical awareness." He picked up the paper, his gaze sweeping across it, his brow furrowed slightly. "This is a two-pronged lack of awareness," he continued, his voice gradually gaining emphasis. "Let's discuss this with examples."

Xing Qingyu walked back to the blackboard, the test paper still in his hand. Without hesitation, he raised his hand and pointed lightly at a question on the blackboard, drawing everyone's attention to it.

"Take this question for example," Xing Qingfeng sighed softly, "I just asked you to calculate the total number of people. It's a problem that can be easily solved by writing a linear equation, right?"

As he spoke, he quickly wrote down the equation on the blackboard. The chalk made a crisp sound as it scratched across the blackboard.

"Whether it does or not doesn't matter, because I still have to teach you eventually. This is just to test your foundation so I can confirm your overall level and prepare lesson plans." He nodded slightly at the test paper, his voice a little helpless. "But can you please look at your answers?"

He turned and looked at the students in the audience, pointing to the solution on the blackboard, and continued, "You can't write it like that. Let me give you an example." Xing Qingyu suddenly paused and took a deep breath, as if trying to suppress his inner emotions. "Some of your answers said there were 7.5/ people in total, and one said people. There are too many examples like this—"

"—But the question is, think about this answer a little further. Half a person? Three-quarters of a person? Is that correct?"

Xing Qingyu didn't answer immediately, but waited quietly. The air seemed even more tense at that moment, and even the students' breathing seemed to become clearer. Many students lowered their heads, whispering to each other, with a hint of confusion and uneasiness on their faces.

Suddenly, a small outburst was heard from one side of the classroom.

"But there really is half a person in the animal department classroom," Flatt suddenly jumped up from his seat, his eyes sparkling, "I've even seen classmates who transformed themselves into three-quarters synthetic beasts!"

The classroom fell silent for a moment, all eyes focused on Flatt. Xing Qingqi frowned slightly, his expression barely changing.

——But he accidentally broke the chalk in his hand.

"..." Xing Qingqiu's gaze shifted slightly towards Flatt. Although his tone remained calm, he lowered his voice with a hint of resignation. "Well, Flatt has a point. After all, this is a case of the devil, and we can't judge it based on common sense." He paused, took a deep breath, and tried to suppress the anger rising in his heart. Xing's class was quite tight and the workload was heavy. If he postponed any unfinished talk to the next class, the teaching rhythm would be completely disrupted. Therefore, he didn't have time to get angry with Flatt for the time being. "But there are no special circumstances mentioned here, so let's stick to the daily life scene-"

"—Didn't you all have a moment of subconscious doubt when you came to this conclusion?" Xing Qingqu asked, "When we see a number that doesn't fit the situation, we should be able to intuitively judge it as abnormal."

"It's not just in daily life. Let me give you another example," Xing Qingqiu's voice sounded again. He walked to the blackboard, pointed to an example question on it, paused, and glanced at the students below.

"I'm sure you've all seen this alchemy problem." Xing Qingfeng pointed to the question written on the blackboard, then pointed to the ratios in the question stem. "The ratio of mercury to sulfur salt is 1:3:9. I've clearly marked this ratio in the question stem. Then, I gave you the amounts of mercury and sulfur."

He raised his eyebrows and continued in that calm voice, "Simply asking you to find the mass of salt, isn't that a simple task?" He paused, his tone beginning to take on a hint of resignation. "However, some students' answers are... that the mass of salt is over 900 times greater than that of mercury. This is simply absurd."

Xing Qingfu stared intently at the students in the audience, as if awaiting their reaction. He then slowly walked back to the podium and said, "Think about it. If this elixir were really served, anyone who took it would likely die instantly."