Looking at the test paper in his hand, Ke Yuhan had a nameless fire in his heart, in order to condense the pressure into motivation, he glanced at the ranking again, Su Xin's name above him was very eye-catching, and he was pulled down by her 13 points in the monthly exam this time, ranking second.

This is the first and last time, Ke Yuhan told himself like this, he can imagine that Su Xin at this time was in another place, happily looking at his ranking over and over again, and the smile on his face became more and more cheerful, as if he had snatched away the positive emotions that belonged to him and put them on her.

He clenched his fists and began to analyze his test paper. His language is too poor, he has been wandering above the passing line, and it is difficult to break through to three digits, he used to rely on his impeccable results in mathematics, physics and chemistry to make up for this loophole, but while he relied on this old book to maintain the throne, Su Xin did not stop.

Ke Yuhan felt a strange panic, but at the same time, his competitiveness was also stimulated. He grabbed his phone and planned to turn it off and study. But the moment he clicked on the screen, he was attracted by Xia Yuan's news.

Xia Yuan: "Hanhan! Emergency! You have to reply to my news for big things! ”

After hesitating again and again, Ke Yuhan felt that human life was more important, he made a questioning expression, and then spread out the poetry book, intending to wait while memorizing.

After reading the title of "Sending Dongyang Horses to Life", I didn't even notice who the author was, and the next news came.

Xia Yuan: "Brother! Is it convenient to call? He didn't seem to be intending to get his permission, and the call came in just two seconds after the sentence was spoken.

"Hey."

"Hey! Feed! Brother Han! I need your help. Xia Yuan's voice was hurried, which made Ke Yuhan's back spine cold, and he remembered that he had fooled himself up the mountain a few days ago, and it was also in this tone.

"What are you going to do? Did Xu Xuanyue plan something again? ”

"Oh no, no, no! It has nothing to do with her! I just need to use your clever brain to analyze some questions and get some answers. ”

"Oh?" Speaking of this, Ke Yuhan smiled a little proudly, thinking that Xia Yuan couldn't see it, he laughed even more unscrupulously. "What to say."

"Look, you and Xu Xuanyue are also in a ...... now in an ambiguous, ambiguous state. ”

"Well, that's nice, finally someone got it right."

"So, in terms of feelings, maybe you have more experience than me, and I want to ask you now to look for clues and help me see...... Xun Ran likes me or not, if you ......"

"I like it."

"Huh?" Xia Yuan paused visibly on the other side, as if he was slightly startled.

"She's definitely going to like you, eh...... If all the auxiliary definitions I have collected are correct. He pulled out his notebook and flipped through it.

"I like it, uh...... It's a ...... for men and women."

"Yes." Ke Yuhan interrupted his statement again, "I can understand that she likes you because she wants to be your girlfriend, or even closer." ”

"So sure?"

"Obviously, all the definitions recorded in my notebook, she is satisfied with you, whether in terms of emotion, behavior or habits, she completely meets the definition of liking for you, and she exceeds it, except for ...... The words are a little vicious, but ...... I understand it as a unique way for Xun Ran to show her care and love to you. ”

After a long while, Xia Yuan was speechless, but Ke Yuhan heard a few sounds of the bed board vibrating, Ke Yuhan guessed that Xia Yuan was lying on the bed, and suddenly he felt that he was also a little tired, and yawned.

"Is there anything else?" Ke Yuhan looked at the time.

"Hanhan, if what you say is true, I'm in big trouble."

"That'...... You say, I'll see if it's serious or not. Ke Yuhan got up, still lying on the bed, he calculated that this conversation might not end for a while.

"Because...... I just told Xun Ran a few days ago that I like Su Xin. ”

"Oh? Why are you lying to her? ”

"Liar? I didn't lie to her. ”

"But you said you like Su Xin."

"yes...... Feed! What do you mean? Xia Yuan seemed to be a little angry, and when he shouted out the next sentence, he broke the sound.

Ke Yuhan took the trouble to explain: "Obviously, you have not reached the level of liking Su Xin at all, which is the definition I just mentioned. ”

"Logic maniac, don't talk about your theory, whether it's true or not, just make an assumption, assume that I just like Su Xin."

Suddenly, the proof question became a counter-proof question, Ke Yuhan felt that this assumption was a little interesting, maybe other people's actions and experiences could also provide arguments for his own proof, he asked Xia Yuan to wait a while, took the notebook and pen on the table, and prepared to record.

"Okay, you can say it."

"I like Su Xin, I told Xun Ran about this a few days ago, how did I know that Xun Ran liked me, but her face changed greatly after hearing this, and she didn't come to school today, it seems that there is a part of the reason in it."

"So what's the trouble?"

"Isn't that troublesome enough?" Xia Yuan seemed a little angry, "I told a girl who likes me that the girl I like is not her, and then these two are still best friends!" Wow! No, my head is big when I think about it. ”

Ke Yuhan's pen paused and began to evaluate the value of this conversation. and also made a bold assumption, if there are other people who like Xu Xuanyue, and that person is also friends with him, will he also fall into this so-called trouble.

"Hey! You're talking. Xia Yuan's voice came.

Ke Yuhan put the phone on the table and pressed the speakerphone.

"Actually, there are quite a few solutions."

"Oh! How to say. ”

"We look at this question as a proposition, and the question is: You like Su Xin, so you will get into trouble. If this is a true proposition, then the solution is hidden in its negative proposition, that is: if you don't like Su Xin, you won't get into trouble. ”

"You fart!" Xia Yuan seemed to be spitting on the phone, and his tone was impassioned, "Can you say something constructive, if it were you, would you not like Xu Xuanyue?" Don't snap the word! I say hypothetical! ”

Ke Yuhan thought for a while and shook his head: "No." ”

"Next! Be serious! ”

Ke Yuhan was most disgusted by others saying that he was not serious enough, so he got angry, got up and came to the desk, and turned the call into video mode.

Xia Yuan accepted the request after a while, and in the dim yellow light, he was lying on the bed, his phone seemed to be leaning against something, and he was wearing a gray vest: "Why is the video, I still have to get dressed." ”

"Show you." Ke Yuhan lifted his glasses and began to draw images on the paper. "If you describe this problem as a functional problem, then the x-axis is how damaged your relationship with Xun Ran is, and the y-axis is how much trouble you have." He lifted it up to show Xia Yuan.

"Can we change the human approach?" Xia Yuan looked disgusted.

"It's the power of mathematical logic." Ke Yuhan then asked, "From the point of view, the relationship between you and Xun Ran has always been maintained before the second-level damage level, and there has not been much contradiction, except for the ones I have not observed, of course. Your level of trouble has been swinging up and down, but when you like Su Xin, it changes drastically. Ke Yuhan drew an arc with a pen and went straight to the direction of the y-axis until he was out of Xia Yuan's line of sight.

"Isn't that a control variable?" Xia Yuan spread out his hand, "The level of my trouble can't be summed up by Xun Ran alone, right?" ”

When Ke Yuhan heard this, he frowned: "It seems that something is wrong." With the crisp sound of paper kneading, this function diagram becomes the belongings of the trash can.

"Big brother." Xia Yuan clasped his hands together, "Let's think of a more reliable way, girls are much more complicated than math!" You can't reason! ”

"Let me try again." Ke Yuhan drew a triangle on the paper: "The three dots represent Xun Ran, you and Su Xin, and the length of the line segment represents the good or bad relationship between you. ”

"So what?"

"Triangles are stable, and if you don't want to get rid of any of the points and segments, you have to make sure that the length of each segment, that is, the relationship between you. Obviously......" Ke Yuhan wiped one side shorter, "The line segment between you and Xun Ran is much shorter, so that the relationship between Su Xin and you is not as long as the third line segment, so it can't form a triangle." ”

This metaphor intrigued Xia Yuan, and he craned his chin and listened carefully: "Oh, so if I can consolidate my relationship with Xun Ran, or between me and Su Xin!" Then you can draw a stable triangle! ”

"Yes." Ke Yuhan nodded, he looked at Xia Yuan with satisfaction, and felt that the sense of accomplishment of teaching others topics was not easy to come by, especially a "student" like Xia Yuan.