As soon as these words came out, the female students in the class looked at Qin Ke with a different color. Regardless of whether Qin Ke and Ning Qingyun had any ambiguity, if he dared to stand up and defend his female classmate, he was

A heroic performance!

Even Ning Qingyun looked up at Qin Ke in surprise. This guy...actually spoke up for himself?

She felt a little moved in her heart unconsciously.

How could the girls know what Qin Ke was really thinking? He was always looking for opportunities to show off and complete new function tasks. How could he miss such a good opportunity?

He quickly calculated in his mind that there were 50 people in the class. Since it was a science class, there were 38 boys and only 12 girls.

If you use map cannons indiscriminately to show off, you can still complete the task, but it is too stupid and may lead to social death and complete isolation in the class. Why not take this opportunity to support the school committee and specifically target the boys?

Woolen cloth!

Qin Keyi spoke sternly and said with dignity: "The academic committee is of noble character and does not want to argue with you. I can't stand it. As boys in the science class, you can't even mentally calculate such a simple question, and you actually have the nerve to do so.

Are you making fun of others? Why not go back and retake the abacus mental arithmetic course in primary school!"

The effect of this wave of map cannons on inciting hatred was unparalleled. It was like a stone that stirred up waves, and the boys were immediately dissatisfied.

Except for a few boys who usually play ball with Qin Ke and have a good relationship with each other, they didn't say anything. The other boys gnashed their teeth and started shouting. After all, they were all new classmates after the science class was divided into classes in the second year of high school. They didn't have much friendship with Qin Ke, and

Seeing him sleeping in class every day and looking like he was giving up on therapy made me feel even more contemptuous, so he naturally became rude when he spoke.

"Qin Ke, you are so good at answering just one question? You must have seen this question somewhere!"

"That's right, I really dare to say anything for my girlfriend!"

"I think you are at the level of a primary school student. Who handed in blank papers and got zero points in the last two monthly exams?"

"I simply don't believe that this guy did it by himself. Ning Qingyun must have done the right thing, and then it will be blamed on him!"

Mathematics teacher Zheng Jianzhou patted the podium and shouted in a deep voice: "Why are you making so much noise? You think this is a vegetable market!"

The authority of teachers in private high schools is still very strong, not to mention the always serious Lao Zheng. When the students saw his serious face, they all realized that the trouble had gone too far and exceeded Lao Zheng's bottom line, and they immediately did not dare to say anything anymore.

Zheng Jianzhou looked at Qin Ke and thought to himself that if this kid could really calculate the question in his mind in three minutes and pass the first level of selection he had set, he would have to try his potential again! But seeing Qin Ke's lazy look,

Afraid that the boy would lie down and sleep like he usually did without knowing a word, he deliberately said with a cold face: "Qin Ke, you think you have very strong thinking ability, right? Then I will give you a question and you are allowed to use a pen, but

You are given three minutes to complete it. If you can't do it, you will be punished by erasing the blackboard for a week, and you are not allowed to sleep in class. Do you dare to agree?"

The pressure of Lao Zheng's stern face was not easy to bear, but Qin Ke's grandfather was even more rigid and serious than Lao Zheng, and Qin Ke had long been accustomed to this level of "death stare".

What's more, from time to time, the system in my ears heard the sound of "Ding! Due to the violent mood swings of the boys, the host has gained double the hatred value of 74 points! The God of Learning experience value is 74...", which directly pushed Qin Ke's mood value to MAX.

, he shrugged nonchalantly:

"Okay, as long as it's within high school, even if you're in the third year of high school, the teacher can answer whatever you want! But first of all, Teacher Zheng, if I can answer it within three minutes, you have to let those men who were muttering weird things just now

Let’s apologize to the school committee together.”

"Okay!" Zheng Jianzhou looked a little angry when he looked at him. He opened his lesson plan notebook, randomly selected a super-outline question that he planned to use for the next monthly exam, and wrote it down on the blackboard.

"It is known that the common ratio q of the geometric sequence {an} is greater than 1, and a3+a4+a5=28, a4+2 is the arithmetic median of a3 and a5. The sequence {bn} satisfies b1=1, and the sequence {(bn+1-bn)an}

The sum of the first n terms of is 2n^2+n, find the formula of the general term of the sequence {bn}."

The students in the audience read the questions carefully, and even Ning Qingyun frowned slightly.

This question is about the sum of a sequence. According to the textbook, it should be a knowledge point that only appears in the compulsory mathematics textbook 5. It will take about two months to cover it. However, Yingyuan Private High School has always encouraged students to prepare for self-study in advance and take the monthly exam.

There will also be a few questions of this kind that are beyond the syllabus to draw points.

The students in the audience immediately began to discuss quietly.

"It's a bit difficult. Is this an over-the-top question?"

"Yes, this involves the knowledge point of the 'sum of the first n terms of the geometric sequence' in the compulsory mathematics textbook 5. Those who have not studied it on their own will not be able to do it."

"Who told Qin Ke to be so arrogant? Teacher Zheng is the most suitable person to ask such an over-the-top question!"

"Hey, this math problem is not difficult for us, but for Qin Ke, a sleeping god who never listens to lectures or studies...it only takes three minutes to solve it...haha."

"Qin Ke will be embarrassed this time, but he just sleeps every day and doesn't care about his face!"

Ning Qingyun listened to the whispers of the classmates around her and glared at Qin Ke angrily. Look, you are so arrogant, will you become the target of public criticism this time?

This question is certainly not difficult for her, who is ranked first in her grade and has taught herself all the high school arts and sciences courses. She can easily solve it by using the dislocation subtraction method. But for students with average or even average math scores,

This kind of geometric sequence summation problem is still a bit tricky to solve. It is not easy to calculate the answer within three minutes.

Ning Qingyun glanced at Qin Ke, do you want to give this guy a hint? After all, this guy just spoke for her...

But this would be considered as helping him to deceive, wouldn't it confirm the rumors among the boys?

The school committee, which has always been serious and principled, is in trouble.

This chapter is not over yet, please click on the next page to continue reading! However, seeing Qin Ke, who spoke for her, facing the "cold looks and ridicule" of countless male classmates, looking so "weak and pitiful", the girl felt soft in her heart.

I sighed secretly and prepared to write down the steps to solve the problem in my notebook.

I didn't take the initiative to tell Qin Ke. If Qin Ke took a sneak peek, I couldn't control it.

But as soon as Ning Qingyun started writing, he heard Qin Ke say calmly: "bn=15-(4n+3)x(1/2)^(n-2)."

Ning Qingyun raised her head in astonishment, and the whole class, both male and female, were also stunned at the same time. Then the male classmates couldn't help but glance at Lao Zheng's expression, and then started talking in low voices.

"Qin Ke was just talking nonsense. It only lasted less than twenty seconds. How did he get the answer? It can't be calculated mentally, right?"

"Is it possible that you are trying to save face?"

"I guess so."

"Hush! The teacher is about to reveal the correct answer!"

Lao Zheng was subconsciously touching the cigarette case in his pocket. He almost crushed the cigarette case when he heard this. He looked at Qin Ke in shock: "How did you come to this conclusion? Come up and write down the problem-solving process on the blackboard.

."

Qin Ke curled his lips in disdain: "For such a simple question to give points, you can just do mental arithmetic, but you still have to write it out? Well, you are the teacher and you are the best."

He walked onto the stage, picked up the chalk and started writing.

"Solution: a4+2 is the arithmetic median of a3 and a5,

We get a3+a5=2a4+4,

So a3+a4+a5=3a4+4=28,

Solve to get a4=8.

From a3+a5=20, we get 8(q+1/q)=20,

…”

The solution process line by line appeared smoothly on the blackboard. The students whispered to each other again:

"It's strange. Looking at Teacher Zheng's expression just now, it seems that Qin Ke didn't just give an answer randomly..."

"Impossible, how can such a question be calculated mentally? And it takes such a short time to calculate it mentally? I don't believe it! He must have seen this question not long ago and still remember the answer."

"But he obviously taught himself the compulsory subject 5, and he writes very fluently."

"Oh! Qin Ke seems to have done it right, the steps are all right!"

Ning Qingyun's usually cold eyes also stared at her male deskmate on the stage in surprise.

This guy is 1.8 meters tall, with sharp eyebrows, big eyes, a high nose bridge, and regular facial features. He is quite human-like, but his hair is naturally curly and looks like it has not been combed carefully, and there is the iconic dull hair on the top of his head.

, his eyes were always half-closed in a state of sleeplessness, and two buttons of his school uniform were unbuttoned, looking like a lazy and carefree problem student.

But such a lazy guy actually calculated the correct answer in his mind?

Yes, there was no need to read the final steps to solve the problem. Ning Qingyun had already determined through mental arithmetic that Qin Ke's answer was correct.

She couldn't help but think in shock, this guy...has he been hiding his mathematical ability before? Can such a question be calculated mentally in more than ten seconds? It would take about two minutes for her to do the mental calculation!

Under the gaze of countless eyes, Qin Ke on the stage finished writing the final steps:

"So 1/2Tn=3+4x1/2+4x(1/2)^2+...+4x(1/2)^(n-2)-(4n-5)x(1/2)^(n-1), so Tn

=14-(4n+3)x(1/2)^(n-2),n≥2.

And b1=1, so bn=15-(4n+3)x(1/2)^(n-2)."

After finishing writing, Qin Ke did not return to his seat. He just glanced back at the boys in the class provocatively and asked Teacher Zheng: "Teacher Zheng, is my solution correct?"

Zheng Jianzhou was stunned. The answer was correct. It was normal to study the mathematical knowledge points in the elective textbook by himself and then solve this problem. But this guy just skipped the steps to solve the problem and just told the final result, right?

How can this be done? Does it really rely on mental arithmetic? If it really relies on mental arithmetic, what a terrible mental arithmetic ability it requires!

"Your solution is correct." Lao Zheng was overjoyed. This kid usually doesn't show off his skills, but he didn't expect him to be a guy who pretends to be a pig and eats the tiger! It is necessary to seriously test this kid's mathematical ability! He immediately wrote again

Asked a question: "You can try this question again."

"Okay! Come here, it's best to try something difficult. The question just now was too easy!"

Qin Ke didn't argue with Lao Zheng about what he said before about "just asking a question". At this time, the system prompts that kept coming to his ears made him almost laugh out loud.

The students in the audience were still giving him hatred points, shock points, and even jealousy points and envy points, making his study experience points increase rapidly.

"This kid is a bit arrogant. I hope Teacher Zheng will face real problems this time."
To be continued...