Hearing Kong Yingda's roar, Fang Yiai shuddered and almost fell off the eaves.

Then Fang Yiai was like avoiding cats and mice, and crawled down the pillar with a few swishs.

Judging by his familiarity, it is obvious that there is no shortage of climbing houses and walls at home.

"Fang Yiai, come here! The school is a place to study, you have been studying in the school for so long, and you have not grown at all, and you still dare to climb the room? Look at this master, don't break the palm of your hand today! ”

Seeing Kong Yingda's angry appearance, Fang Yiai was so frightened that she trembled, and couldn't help but point at Li Su and said: "Master, the reason why students climb the room is all because of a bet with His Royal Highness the Sixth Prince. The master only beats the student himself, and the student is not convinced! ”

Kong Yingda shouted: "Okay, I actually dare to bet, it's against you!" Li Su, come here, and fight with Fang Yiai. ”

Hearing that Li Tai was also going to fight with him, the schoolchildren around Li Tai couldn't help but show a look of schadenfreude on their faces.

Cheng Chuliang opened his mouth, wanting to intercede for Li Su, but in the end he closed his mouth stupidly.

He was not treated by the master at all, and if he pleaded, he was afraid that it would add fuel to the fire.

I saw Li Su walk to the master's side unhurriedly, saluted the master, and said, "So that the master can know that the student has not made a bet with Fang Yiai." The student simply said that two stones, one large and one small, fell from the same height at the same time, and eventually they would land at the same time. Fang Yiai doesn't believe it, he has to climb to the eaves to do experiments, and it has nothing to do with students. ”

Kong Yingda couldn't help but say angrily: "If it weren't for your problem, would Fang Yiai climb the house?" It's clearly related to you, and you dare to deny it! ”

Li Su calmly asked: "Dare to ask the master, if someone kills someone with a kitchen knife, will the government punish the crime of the vendor who sells kitchen knives?" ”

"It's-"

Hearing Li Su's question, Kong Yingda couldn't interface.

Obviously, there is no cure for the sin of a kitchen knife seller.

Then, in the same way, he can't hit Li Su's palm.

It's just that these two things are the same thing?

Vaguely, Kong Yingda always felt that something was wrong, but it was difficult to figure it out for a while.

So, Kong Yingda was even more angry.

Said viciously to Fang Yiai: "Stretch out your hand!" ”

Fang Yiai trembled and stretched out his little hand, and a little white face had turned into a chrysanthemum.

Syllable! Syllable! Syllable!

"Ahh Yes! Yes! ”

Li Su felt pain when he listened to it next to him, and hurriedly walked away quietly.

After two cups of tea, the sound of popping disappeared.

Kong Yingda's son was very tired and left out of breath.

Fang Yiai walked into the school building, a pair of small hands have been swollen into pig's trotters, looking at that appearance, there is no ten days and a half months, and it will definitely not be swollen.

At the back of the school building, Kong Yingda, who was out of breath, couldn't help but stop.

Because he thought of a question, Li was clearly talking nonsense.

Two stones, one large and one small, fall from the same height at the same time, it is clear that the big stone landed first, how can it be that they land at the same time?

Then, Kong Yingda couldn't help but pick up two stones from the side and lift them to his chest, and let go at the same time.

Syllable!

Well?

Kong Yingda's pupils shrank slightly, and her mind was full of doubts.

How is it possible to land at the same time?

So, Kong Yingda couldn't help but pick up the two stones from the ground, and then lifted them high, raised them above his head and let go at the same time.

Syllable!

Kong Yingda, who opened his mouth wide and was full of shock, now has some understanding of why Fang Yiai climbed the house.

Then, when Kong Yingda raised his head, he saw Wang Xiaotong, who taught arithmetic, standing in front of him, looking at him dumbfounded.

It's over, the act of holding two stones high just now must have been seen by Wang Xiaotong.

It's too embarrassing, isn't it? Too ashamed, isn't it?

The old man's reputation was ruined!

The old man was hurt by Li Su's kid!

However, ginger is old and spicy, and soon Kong Yingda came up with an idea.

Kong Yingda walked up to Wang Xiaotong casually, and couldn't help asking: "Professor Wang, the old man asked you a question, you said that two stones, one large and one small, fall freely at the same height, and the stone falls first?" ”

Wang Xiaotong said with a strange expression: "Of course it landed at the same time!" ”

Kong Yingda couldn't help but look at Wang Xiaotong dumbfounded and asked, "How do you know?" Did that kid tell you the answer? ”

Wang Xiaotong felt that Kong Yingda, the old man, was very weird today, and always said something inexplicable.

Wang Xiaotong still had to go to class, so he dealt with Kong Yingda and walked in the direction of the school.

But walking on the road, Wang Xiaotong reacted.

Just now, the old man Kong Yingda said, it was Li Yu's kid who told me the answer?

Does Li Su also know the correct answer to this question?

This question, but he discovered it by accident, how likely is he to know the answer?

For a while, Wang Xiaotong couldn't help but have great curiosity about Li Su.

Not long after, Wang Xiaotong came to the school and began to teach the students about arithmetic.

Wang Xiaotong was a famous mathematician in the Tang Dynasty, and the ancient arithmetic he compiled later became the arithmetic textbook of the Tang Dynasty.

Of course, Wang Xiaotong has not yet compiled this book, and his theoretical level has not yet reached the height of later.

After finishing the class, Wang Xiaotong suddenly wanted to test Li Su, so he gave all the students a more complicated arithmetic problem.

In fact, it is not very difficult, but it is extremely tedious.

The question is, one plus two plus three all the way up to a hundred, what is the answer.

After Wang Xiaotong finished the question, except for Li Su, the other schoolchildren quickly began to calculate with their pens.

Only Li Su supported the ground with two hands and half-squatted.

It turned out that he had been kneeling for a long time and his legs were numb.

Wang Xiaotong walked up to Li Su and asked, "Your Highness, everyone else is solving the problem, why hasn't Your Highness solved the problem?" ”

Li Su couldn't help but stand up and replied, "Sir, the student has already calculated the result. ”

Wang Xiaotong asked in surprise, "Oh? So what do you say the result is? ”

Li Su said calmly: "Five thousand and fifty." ”

Well?

Did it really work out?

But how is this possible?

How could he have calculated it in such a short time?

Wang Xiaotong couldn't help but ask curiously: "Have you calculated this question before?" ”

Li Su said lightly: "No, but there is actually a simple calculation method for this problem." One plus one hundred equals one hundred and one, two plus ninety-nine equals one hundred and one, three plus ninety-eight equals one hundred and one, and fifty plus fifty-one equals one hundred and one. There are fifty one hundred and one, and after multipliing, you can get the final result, five thousand and fifty. ”

Hearing Li Su's algorithm, Wang Xiaotong couldn't help but be surprised.

Li Su's algorithm is actually an algorithm for a series of numbers.

In the nine chapters of arithmetic, there is actually a similar algorithm, but it belongs to a relatively advanced knowledge, and Wang Xiaotong has not taught it here.

He wondered how Li Su knew this method.