Teacher Xu, Please Take Care of the Reckless Students in Your Class

Class 30.

After Wei Minghai finished that question, all the students in the class were busy.

That question has no value to them.

Even He Ruohua understood.

Wei Minghai returned to his seat, and as soon as he sat down, the same table came over, "Minghai, I have an app here, do you want to try it?"

Wei Minghai, "?"

"It's about math!"

Wei Minghai grinned, "Then I'm excited."

The app called Gold Medal made Wei Minghai shine.

The same table also added, "It is said that this is recommended by the National Mathematical Olympiad Association and the Education Bureau!"

"It contains all kinds of math Olympiad questions!"

"There is a leaderboard for brushing questions!"

"There are rankings for consecutive answers!"

"Total correct answer rate ranking!"

"Comparison of the total number of questions answered and the total time!"

"There are only three lists right now!"

"Although you have an id, you still need to enter your exact name, ID number, and school."

"There is a VR mode, as long as the camera is turned on, even if it is time to answer the question, if you answer the question on the paper, the system will automatically enter it, God is very good!"

Wei Minghai has registered an account, and the id is Wei (Mr. Xu's student).

Without any preparation, I started answering the questions.

The same tablemate was stunned at the time, "Wait, wait! Wei Minghai, didn't you read the strategy?"

"Anyway, you should also go to the forum for a stroll!"

"This app has only become popular this month, and it has attracted the attention of eight million students!"

"According to the feedback from the forum, the probability of [-] million people brushing the same question is almost zero!"

"This question bank is huge!"

"Someone has done statistics. If you want to brush the same topic, you need at least one in five million probability! One in five million! Hiss...it's scary!"

"And the most basic questions here are the college entrance examination questions, the Mathematical Olympiad competition, and even the university entrance examination questions!"

"Wei Minghai, don't put too much pressure on yourself..."

The tablemate was kind, but after Wei Minghai saw the question, he concentrated on it and blocked him.

Question 1: Prove that the arithmetic square root of the product of four consecutive natural numbers plus [-] is still a natural number.

Without any hesitation, Wei Minghai opened the VR directly and wrote:

四个连续自然数的乘积可以表示成n（n＋1）（n＋2）（n＋3）＝（n^2＋3n）（n^2＋8n＋2）＝（n^2＋3n＋1）^2－1，

Therefore, the product of four consecutive natural numbers plus 1 is a perfect square number, so the conclusion of this question holds.

"Ding! Recognition result: correct!"

"Time: 1 minute 17 seconds!"

"Ranking of this question: 1!"

Without any hesitation, Wei Minghai continued to the next question.

The second question: Find the largest perfect square, after crossing out its last two digits, it still has a perfect square.

The third question: Find five different positive integers so that they are mutually prime, and the sum of any n (n≤5) numbers is a composite number.

Fourth question:  …

……

unstoppable.

Wei Minghai didn't care about getting out of class, he didn't care about get out of class, he didn't go to the bathroom, and he was always obsessed with the questions on the Gold Medal Math app.

The title here made him feel like he was returning to the sea.

Over the past month, after Wei Minghai studied hard, especially when faced with mathematics, he felt that he was stranded more than once!

Especially today, he feels more and more strongly that he is a dragon trapped in shallow water!

But the appearance of this app made him feel the absolute charm of mathematics!

The more he brushed, the more excited Wei Minghai became.

He was sweating all over!

"Cool!"