Chapter 137: No need to check, there are no difficult problems

After lamenting, Xu Qingzhou took a deep breath and picked up his pen to write slowly.

Question 1, simple.

Question 2, no problem either.

The second to last question.

Let the function f(x)=∑n=1∞sin(nx)/(n²+x²), where x∈R. Prove f(x) is... It's not difficult, involving series theory, function continuity, and the fundamental theorem of calculus. It can be done using the inequality |sin(nx)|≤1 and the convergence of the series ∑n=1∞ 1/(n²+x²).

40 minutes passed, Xu Qingzhou put away his pen and took a sip of water. All around were the sounds of rustling writing.

Beside him, Xu Zhengyang was grabbing his hair, showing a difficult expression. Kong Xianbo was calculating, and several sheets of draft paper were already piled in front of him. Xue Ying and the others also had exceptionally solemn expressions at this time.

"Hmm," Xu Qingzhou nodded.

Read! {

Simple? The old professor smiled in his heart. This young man was quite arrogant. The questions Old Gu set were tricky, and someone actually said it was simple? Shaking his head, he sat down on the podium and curiously picked up Xu Qingzhou's exam paper, first looking at the name.

Xu Qingzhou was the only one in the library. Song Yao had a professional course exam and was busy reviewing for it, so she didn't come to the library to save time.

Xu Zhengyang: Asking, if I have to take a make-up exam, what is the probability of passing?

Old Xu?

In the distance, the old professor saw Xu Qingzhou looking around and coughed lightly, reminding Xu Qingzhou not to play smart.

Regarding Xu Qingzhou's behavior of handing in the paper after 30 minutes, the graduate student wasn't surprised. Even in the top institutions, there are always one or two people who will slack off.

The exam times for the School of Mathematics and the School of Physics were staggered by a few days. On the morning of the 5th, the last subject of the School of Mathematics, Advanced Algebra, was tested, while the School of Physics tested General Physics.

Kong Xianbo and the others, who were lowering their heads and doing questions earnestly, also raised their heads blankly. Hand in the paper? Hand in what paper?

After the exam, Xu Qingzhou went straight to the library to continue reading.

Another slacker beside him, a graduate student, sighed. This is only freshman year, and he's already starting to slack off.

After saying that, he smiled embarrassedly, carried his school bag, and left a dashing back for the people in the classroom who were gnashing their teeth.

The questions Professor Gu set this time were indeed difficult. Don't know if he wanted to kill the arrogance of this group of heaven's favorites or if it was just a routine operation. Based on Xu Qingzhou's understanding of Professor Gu, he guessed it leaned toward the former.

Yo, handled well.

But just now he saw this little guy seemed to be writing earnestly? Downstairs.

Then there were Zhai Ziqiang, Zhang Shuyi, and Xue Ying. Perhaps because he had lived for dozens of years, Xu Qingzhou felt a bit emotional. This is youth, being able to vent wantonly. If people of age really encountered things, they wouldn't appear in Moments at all.

The dorm building was still the same as before. Advertisements for study abroad agencies were posted in the corridor, telling which senior had gone to Harvard, Stanford, or MIT. They were like countless warnings, telling students about the future they might miss—when applying to foreign schools, every exam score would be scrutinized.

The last question was the most difficult.

Xu Qingzhou thought to himself: Hehe, let you feel the despair I felt during the politics exam.

For example, the kid drinking water was very suspicious.

The first small question was a typical limit problem.

The old professor took the exam paper with doubt and glanced at it.

Like Xu Zhengyang, he was wrongly killed; this guy didn't have arrogance.

Xu Qingzhou? The old professor raised his eyebrows, seemingly having heard of this young man. Oh, right, it's the student who just entered the School of Mathematics. His talent is very good, and that thesis was written quite brilliantly. If it were him... The old professor laughed dumbly. This freshman question indeed couldn't stump him.

5 minutes later, the old professor put down the exam paper and let out a breath. Not bad, not bad, the School of Mathematics really produced a good seedling. Hmm? But, just after reminding him, he saw Xu Qingzhou pick up, get up, and walk toward the podium with his water cup and exam paper.

Downstairs, Xu Zhengyang and the others cursed in their hearts at the same time.

The old professor nodded again.

The old professor began to check Xu Qingzhou's exam paper, scanning the simple questions in front roughly, then skipped them and looked directly at the last two big questions.

Kong Xianbo: Ahhh, Mathematical Analysis, almost didn't finish... Finished.

Unsurprisingly, there was a wail in Moments.

Xu Qingzhou watched with interest, flipped through it for a long time, and saw two words in the gaps between the words—finished.

Everyone's Moments were very interesting, using different texts and emojis to express that they didn't do well in the exam.

Question 1... Hmm, answered well...

On the side, Xu Zhengyang watched and gnashed his teeth. He hadn't even finished half, and the other person had already handed in the paper? The gap between people had reached such a terrifying level!

At the very least, up to now, he hadn't thought of a suitable solution.

Damn, it's only been 40 minutes, and this guy finished?!

The old professor nodded slightly, showing that this young man's mathematical foundation was very solid.

!.

A person was missing opposite, and when he was tired, there was no pretty face to look at, so he could only take out his phone.

The old professor was surprised: "Hand in the paper?"

Don't look at these professors wearing reading glasses; they know what you want to do next from a small action.

"No need to check," Xu Qingzhou shook his head, smiled "shyly": "There are no difficult problems, shouldn't be wrong."

Kong Xianbo was a bit dazed. Yes, he was mentally prepared that Old Xu was definitely a strong competitor in professional courses, but... he didn't expect it to be so fast! Liang Quanjie also raised his head, looking at Xu Qingzhou walking to the podium with the exam paper in astonishment.

No difficult problems? Damn, listen to what kind of human talk is this!

There was actually a trap here, because since ln(1+x) has a value of 0 at x=0, substituting it directly would lead to a denominator of 0. A more precise handling is to use L'Hôpital's rule or Taylor expansion to find the limit.

A day passed quickly. At 10:30 PM, Xu Qingzhou returned to the dorm building with his school bag.

Calculating for most of the day, only to find it was wrong in the end, that's maddening.

Oh? Written full? "Not check it?" the old professor asked.

Up to now, he had done half, and he had also looked at it when handing out the papers; there were two questions that were really not small in difficulty.

The old professor obviously thought so too. Having taught for decades, he didn't know how many such people he had seen.

Indeed, Xu Qingzhou also discovered this trap when doing this question, and he sighed a little in his heart. Old Gu's heart was too dark; don't know how many people fell into this trap.

Of course, and reading for a graduate degree in the country, GPA is almost the only condition for determining the recommendation qualification.

Glancing at the newly posted flyer, Xu Qingzhou shook his head and sighed. Jingda, full of roll kings everywhere.

If he weren't a cheater, he would probably have to roll with his life like in his previous life.

When he returned to the dorm, his roommates had just returned. It had only been one day, but Xu Zhengyang had become much more vicissitudinous, as if he had grown up instantly. To be precise, there was a trace of melancholy on his face.

(End of chapter) ===== CHAPTER 138 =====