Emperor of the Tang Dynasty

Wu Zetian felt completely bewildered. She looked at the abacus repeatedly. How could it be seen that it was just beads strung on the board one after another?What use can it be?

"If you want to use this abacus, you also need a special method," Duan Lun said with a smile, "I'm just talking about it now, maybe you don't understand it, but you'll find out by actually trying it."

Wu Zetian asked cautiously, "Master Duan, how do you try this? Shall I learn how to use it on the spot?"

Duan Lun shook his head and said, "That's not necessary. In order to test this abacus, His Royal Highness the King of Chu has already taught me how to use the abacus in advance. I have to say that it is really many times more convenient than before!"

"And if you want to test the abacus, the fastest way is to quickly solve the calculation problems in the mathematics. If the King of Chu comes down to test, then everyone in the world knows that His Royal Highness is unparalleled in math, and can't see the effect, so I will play it myself. , you are responsible for asking the question."

This time Wu Zetian understood. The presence of his own teacher, Li You, made Wu Zetian very courageous. He immediately entered the state and asked unceremoniously, "How much is one hundred and nine seventy-two?"

"Seven thousand eight hundred and forty-eight."

As soon as Wu Zetian's voice fell, Duan Lun gave the answer directly.

This was so fast that even Wu Zetian, the person who asked the question, couldn't react, and blinked his eyes in confusion.

"What... what?"

Wait, what just happened?

She only saw that Mr. Duan seemed to dial the abacus casually, and then gave the answer directly? !

"Then is this answer correct?" Wu Zetian did a quick mental calculation, "Really... it's really seven thousand eight hundred and forty-eight!"

Seeing Wu Zetian's face full of shock, Li You smiled and said nothing.

"continue."

Duan Lun also smiled, as if it was an invitation to challenge, Wu Zetian looked at Li You who was smiling and didn't say a word, and became even more energetic.

"Is the question just too simple? That's good..."

Wu Zetian took a deep breath and said, "Five percent of the three thousand six hundred and seventy-eight miles has been doubled forty-one, plus one third of the two thousand five hundred and ninety-two, minus seven hundred and one hundred. Sixty-three, what is nineteen times that number?"

This topic can be said to be extremely complicated, but it is not difficult to beat Duan Lun at all.

Crackling!

Duan Lun's fingers made a crisp sound on the abacus, and after just one breath, Duan Lun said calmly and affirmatively: "Nine times this number is one hundred and forty-two thousand seven thousand three hundred and eighteen. ."

"seriously?!"

Wu Zetian was stunned for a while, how could such a huge number of calculations be completed in just one breath?

She hurriedly started a difficult mental calculation, and it took a few seconds to get the final result.

"Sure enough, it's impossible to calculate so quickly!" Wu Zetian seemed to have won, "Your result is wrong! The correct answer is [-]!"

However, after Wu Zetian finished speaking, he found that Li You and Duan Lun were both looking at her with a half-smile.

"What... what's wrong? Teacher?"

This made Wu Zetian feel a little empty in his heart, but Li You laughed and said, "Do the math again, and see who is wrong with 910?"

Wu Zetian was a little unconvinced when he heard the words, but this was the teacher's words, so Wu Zetian obeyed and did another mental calculation.

After this calculation, Wu Zetian was immediately stunned on the spot.

She widened her eyes in disbelief, and those who didn't believe in evil repeated the calculation in her mind several times before her body suddenly shook!

"how so?!"

It turns out... the wrong person is actually her, she just made a mistake!

The correct answer is really [-]!

"Actually right! This... how much time did it take!"

Wu Zetian was in deep shock at this time, unable to extricate himself for a long time, when she finally reacted, her eyes immediately lit up with infinite light.

"Teacher!" Wu Zetian looked at Li You with bright eyes, "I want to learn how to use this abacus!"

Li You smiled slightly: "You want to learn? I'll teach you."

.

Chapter 478 Yes, I'm Just Taking Revenge

Because of the popularization of abacus among the students, the speed of checking accounts has increased rapidly, and almost only on the ninth day, the first batch of corrupt officials has been released.

The first batch of corrupt officials had as many as twenty people, including a big tiger, so Li You needed to show them to Li Shimin.

After all, this big tiger is also one of Li Shimin's subordinates, and it is not very good to do it directly without paying attention to anything.

When Li Shimin saw Li You looking for him with a thick stack of ledgers in his hand, surprise was written all over his face.

"Yangjie, you are..." Li Shimin was stunned for a while and then reacted, "Did you find the first batch of people so quickly?!"

"It's not too soon, it took nine days."

Li You said casually and put down the ledger in front of Li Shimin.

Nine days isn't fast enough? !

Li Shimin was secretly surprised, because although he was not in the imperial court, he was in control of all the movements. He knew that Li You's ten days also included the time to train students!

While amazed, Li Shimin picked up a piece of rice paper on the account book, on which was written the list of the first [-] people.