The ABC International Mathematics Competition is one of the most mathematical competitions in the world.

Even though Gladiolus is a high mathematics teacher at Nanshi University, and even if Wang Feng is a mathematics professor at Nanshi University, there are still some questions that I can't figure out and don't know how to answer.

But at this time, Zhang Xingxing's test paper was all answered, and the steps to solve the questions were very clear and clear, and even many things were answered by high school formulas and theorems of motion.

The formulas and theorems learned in college almost did not appear in Zhang Xingxing's answers.

No, it also appeared, but Zhang Xingxing didn't seem to know that this was a theorem or a formula, and proved it again, which was written on the test paper.

Therefore, Zhang Xingxing's entire test paper looks dense, and there are almost no gaps.

However, Zhang Xingxing's answers and solution steps had a feeling of opening up in the eyes of Tang Iris and Wang Feng.

It turns out that this question can also be answered in this way.

Tang Yipu and Wang Feng stood beside Zhang Xingxing and nodded incessantly.

However, the idea that Zhang Xingxing got the test paper in advance became more and more firm.

Isn't it?

If Zhang Xingxing didn't get the test paper, then how did he finish answering so many questions?

According to Zhang Xingxing's method of answering, even one of the questions may have to 'spend' for more than half an hour, not to mention, there are nearly 20 questions here.

Moreover, with such a huge and complex calculation, there is not a single word on Zhang Xingxing's scratch paper, which means that all the calculations are calculated by Zhang Xingxing's heart.

But, is this possible?

No way!

Just as Tang Yipu and Wang Feng opened their mouths, they were about to speak: cancel Zhang Xingxing's examination qualifications.

Zhang Xingxing's eyes suddenly froze, and he shouted, "Teacher, give me 30 pieces of scratch paper." ”

Zhang Xingxing's voice broke the quiet classroom and attracted everyone's attention.

Ding Chen, who was sitting in the back, sneered in his heart, "30 pieces of scratch paper, you can't use so much!"

"Quick!" Zhang Xingxing shouted again in an unmistakable voice.

Wang Feng's eyes narrowed, and something came to his mind that Ding Chen said about Zhang Xingxing's mathematical talent yesterday.

Then, Wang Feng noticed Zhang Xingxing again, and his eyes kept staring at the last additional question.

An absurd idea appeared in Wang Feng's mind.

Zhang Xingxing wants to answer additional questions?

Wang Feng also read the supplementary problem and confirmed at a glance that this is Goldbach's conjecture, which is known as one of the three major problems in mathematics.

There are three major problems in mathematics, the four 'color' conjectures, Fermat's theorem and Goldbach's conjecture.

Among them, Goldbach's conjecture is known as a pearl in the field of mathematics, and it is also the only one of the three major problems that has not been solved so far.

When Wang Feng saw the score of 100 points in the last additional question, he was stunned at first, but after seeing that it was Goldbach's conjecture, he chuckled again.

A three-hour exam is very difficult, even if you want to 'figure out' the context of Goldbach's conjecture.

What's more, there are nearly 20 questions in front of the additional questions, which are also very difficult and amazing, I am afraid that the vast majority of students have not had time to study this last additional question, and the exam is already over.

But now Zhang Xingxing wants to solve Goldbach's conjecture?

In Wang Feng's mind, a terrifying conjecture that he had come up with after studying the deeds of many geniuses.

Perhaps, the nearly 20 difficult questions in front of him, when Zhang Xingxing first got the test paper, thought it was too simple, and he almost didn't have time to think, so he just wrote it.

Wang Feng also knew that he had been in front of him for more than half an hour and had not paid attention to the students below.

If someone says that a normal person can answer the test papers of the ABC International Mathematics Competition in half an hour, Wang Feng will definitely disdain it.

But what if it's not a normal person?

If Zhang Xingxing is that kind of perverted level genius...... Perhaps, it is not impossible for him to answer all the questions in half an hour, right?

Wang Feng thought a lot, and before Tang Yipu spoke, he said, "Okay! ”

Under Tang Yipu's suspicious gaze, Wang Feng hurriedly ran out of the classroom, and it took almost less than three minutes for him to run back sweating profusely.

I saw gladiolus, but I became more and more suspicious.

Tang Yipu couldn't understand, just now, Wang Feng, like herself, was still suspecting Zhang Xingxing of cheating, why did she suddenly help him get the scratch paper again?

But why does Zhang Xingxing need so much scratch paper?

Soon, gladiolus suddenly widened her eyes, could it be that she wanted to answer the last additional question?

But, this is Goldbach's conjecture!

Zhang Xingxing took the scratch paper without any hesitation, the pen and ink were flying, and a column of numbers and symbols jumped on the paper.

Wang Feng and Tang Iris stood beside Zhang Xingxing, carefully observed, and frowned slightly.

The two of them had also studied the Goldbach conjecture, but the Goldbach conjecture was so complicated that even if the two of them used all their 'fine' strength, they could only peek at one or two.

However, there are some mathematicians in the world who have calculated "9+9", "7+7", "5+7"...... Even "1+2" has been calculated.

Wang Feng and Tang Calamus have both seen these calculations, and they basically know the specific steps and methods.

However, what is going on with Zhang Xingxing now?

How does it seem to have nothing to do with the solution of Goldbach's conjecture? What is he writing now?

Wang Feng frowned, could it be that he was wrong? He wasn't a math geek?

Wang Feng, a mathematics professor, couldn't see what Zhang Xingxing wrote, and Tang Calamus couldn't understand it even more.

However, Tang Yipu saw one thing, the reasoning written by Zhang Xingxing is very logical, at least there is no problem.

The two continued to stand aside, observing what Zhang Xingxing was writing.

"Stomp, stomp!"

Zhang Xingxing's speed of answering questions became faster and faster, like flowing streams, rapid and violent, making the sound of the tip of the pen colliding with the table.

Soon, the first piece of scratch paper was filled with numbers and symbols.

Zhang Xingxing quickly 'pulled' out the second piece of scratch paper.

This time, Zhang Xingxing's writing speed became more and more 'intense', and the "stepping" was like a special musical instrument, and even had a sense of rhythm.

Wang Feng and Tang Iris's brows furrowed even more, and suddenly their eyes widened, and their hearts beat violently.

It turns out that this simple high school formula can still be used in this way.

Wang Feng and Tang Calamus's minds also began to liven up, if so, they were indeed slowly walking on the road of proving Goldbach's conjecture.

This ingenious method of proof, Wang Feng and gladiolus, has never been seen.

They stared more and more intently at the star's scratch paper, blinking as little as possible.

"Teacher, that Zhang Xingxing is too noisy. Ding Chen finally couldn't help but shout.