That's when ......

Hey?!

Xiong Chu Mo realized that something was not quite right.

Why did there be a burst of gasps from the audience?

Why didn't Lu Yifan move his pen, just looked at himself with a smile?

Glanced at the five questions on Lu Yifan's blackboard......

it!

It's done?!!!

Xiong Chu Mo was slightly stunned, and then said, "Blind is not counted. ”

Lu Yifan shrugged his shoulders and shouted to the audience: "Who has a calculator, please calculate it." ”

Then I heard shouts from the audience one after another.

"The first question is right!"

"I've got the second question, and I'm right!"

"My God, the third question is right to open the root number 5 times!"

"Ziao, the compound calculus of the fourth problem is also correct!"

"My God, grandpa, the multiple matrix of the fifth question is also correct! I have to count this problem for half an hour!"

All five questions are correct!

And Lu Yifan didn't even think about it, so he just wrote the answer up!

The most terrifying thing is that his hands are so fast that he can't even write the answer, not even five seconds!

When Xiong finished a question at the end of the year, Lu Yifan had already done all five questions correctly and wrote the answers on the blackboard!

The students blew up again!

"This is terrifying, isn't it? I didn't get it all right in less than five seconds, and I wrote down such a long number!"

"Damn, is this still human? It's just a humanoid calculator!"

"How did he do it? Calculus and matrices would take three to five minutes just to figure out how to calculate, right?"

Nangong Wu also looked at Lu Yifan in shock with an unbelievable look below.

It's too fake, right?

Such a complex question can be solved in a few seconds?

Lu Yifan also snickered secretly.

Compare with Lao Tzu for quick calculations?

Lao Tzu has eaten the elixir! The calculation speed of the brain is comparable to that of a super calculator!

Lu Yifan glanced at these questions on the blackboard, and he already knew the answers.

"No way! Without a calculator, you can't figure out the problem in such a short time!" Xiong Chumo shouted as if he had seen a ghost.

"You can't do it because you're not doing it right. As long as you use the method I invented and train for a long time, you can be better than you in quick calculations!" Lu Yifan smiled slightly.

The method invented by Lu Yifan?

Everyone looked at each other.

As we all know, the basic mathematical calculation rules are addition, subtraction, multiplication and division of the four operations, and quick calculation is to substitute these four rules into some existing formulas in the mind to achieve the effect of quick problem solving.

Those formulas have long been used by everyone, so the quick calculation test is the reaction speed of the user.

Lu Yifan now actually said that he has his own quick calculation method!

And everyone can use it?!

"Boasting is not a draft, and the quick calculation method has taken thousands of years to summarize by our mathematicians. What good quick calculation method can you have as a student?" Xiong Chu Mo questioned.

"Hey, Dean Xiong, you're here again, have you forgotten what I said before? Disciples don't have to be inferior to teachers! If you can't do it, I can't do it? Your logic is too nonsense, isn't it?" Lu Yifan chuckled.

"Okay, then I'll hear it, what kind of awesome quick calculation method you invented yourself, or can anyone be better than me!"

Xiong didn't believe in this evil at the beginning and the end!

If you are a student who has not yet graduated, can you still make any achievements in mathematics?

Lu Yifan spread his hands, looking very helpless.

Picking up the chalk, he pulled down a blank piece of the sliding blackboard on the podium, and wrote down three neat and beautiful regular script characters on it--abacus mental arithmetic!!

"Mental arithmetic? What is this? Use an abacus to solve problems?" Xiong Chu Mo wondered.

Many of the mathematicians in the audience were also confused, not knowing what it was.

This method of mental arithmetic can be said to be the pride of the Chinese mathematical community before the heavenly wish charm changed the world!

Because this calculation method evolved from the abacus, it is absolutely original by the Chinese people.

Before the Heavenly Wish Charm changed the world, the National Olympiad team used mental arithmetic to train all masters.

When the abacus method is mature, those quick arithmetic masters can pick up the paper and scan it at a glance and start to write the answer directly.

Lu Yifan picked up the chalk again, and while writing and drawing, he explained: "The so-called abacus mental arithmetic is abacus-style mental arithmetic.

Abacus is a calculation method that uses the abacus as a tool to add, subtract, multiply, divide, and open squares.

When the user can skillfully operate the abacus, in addition to quickly finding the correct answer, it can also depict the disc type, grade and floating changes of the abacus into the brain through the growth of brain cells, that is, as if there is a live abacus in the brain, and the image of this live abacus is called a virtual disk.

It uses perception, image, memory and other processes to complete abacus operations in the brain, which is what we call abacus mental arithmetic. ”

On the whole blackboard, all the drawings are about the specific training process and methods of mental arithmetic.

When Xiong Chu and Mo saw these methods, his shocked mouth opened and he didn't close it for a long time.

As a mathematician, I can naturally quickly understand the specific application of the so-called mental arithmetic.

"The speed of the master of mental arithmetic is astonishing.

Often, as long as you hear the number of questions or see the type of calculation question yourself, the calculator can blurt out the answer or write it out immediately. Dean Li, if you don't believe me, you can give it a try. Lu Yifan said with a confident smile.

According to Lu Yifan's method, Xiong Chumo glanced at the question he had just done again......

A miracle happened!

The imaginary abacus in my mind, after the floating changes, the answer is immediately clear and clear!

Subtle!

No!

This method can be called "absolute"!

Xiong Chumo's eyes looked at the blackboard with abacus written on it obsessively, and his hands trembled slightly, as if he was babbling treasures: "Good way! What a good way!"

The old professors of the Shuyuan who were sitting and watching below were also like the collective high (harmonious) tide, and everyone blushed and screamed.

"Write it down! This is a new and efficient method of quick calculation discovered in the mathematical community!"

"I just used it, and the effect is unbelievable!"

"The quick calculation method evolved from the abacus is definitely my original Huaxia!"

"Publishing this method will definitely make the Chinese mathematical community raise their eyebrows!"

Nangong Wu was stunned.

Don't you suck it, right?

As soon as it comes out, it is a quick calculation method that shakes the whole world?

Fake, right?

Youkai, right?!

You're too wicked, aren't you!!

(End of chapter)