"If our teacher Li asks someone to go to the office to give a lecture, he will beat someone......"

"......" is also drunk: "Don't worry, I don't beat people, I want to beat, and I only beat myself, okay?"

"Okay, if you dare to hit me, I'll vote for my dad and let him shoot you!"

You Zishi almost turned his face when he heard it. The bear child stood in place and looked at Youzi Shi a few more times, and then finally moved his steps and walked in front of the iron railing.

Endure. I endure.

You Zishi stretched out his hands and took the delicate and small sunglasses box from the little monk's hand, and the little guy didn't want to give it at the first time, so he took it back.

But how can his strength be as great as Youzishi's, and Youzishi has seized the opportunity and grabbed it in his hands.

Hey hey –

You Zishi couldn't help laughing out loud like a long drought and a rainy day, and frightened the bear child back two steps and farther away from the iron fence.

"Come, come!"

"No!" the bear child resisted.

"Come, I'll give you a lecture!"

"You rob me of something, you still want to hit me!" shouted the bear child.

"Don't-"

Seeing that he couldn't persuade the little thing, You Zishi hurriedly shook the box in his hand in the air a few times, and then pressed the thumb of his right hand on the module of the fingerprint identification set, and at the same time quickly filled in the nine-square grid that appeared on the front of the box.

The kid was visibly dumbfounded.

"How did you open the box?"

"You won't, I'll teach you!" said the wandering poet triumphantly.

"Okay, good, hurry, hurry, hurry!" The bear child also knew that important things had to be said three times. Oh, my God!

"I can teach you, but you have to promise me that you don't tell anyone about the things between us, only let me know what you know......"

"God knows!" This little monk not only learned to answer, but also was obviously a little bit, and he was also very impatient: "Okay, I won't tell my father, I talked to a prisoner, that's it, let's start quickly!"

“……”

That's fine.

You Zishi began to hold the case of sunglasses to explain to the little monk. This particular box is the same as sunglasses, I don't know which material is used from the future, quite chic, the front and back of the box are engraved with different fonts "Home and everything is prosperous" and "Man, no money, there is no world!", other places can not see any clues.

Outsiders will never know what the purpose of this box is or what kind of thing it contains.

In fact, the front and back of the box are inlaid with an electronic display made of a super special metal jade.

However, whether it is the fingerprint reader on the reverse side or the nine-square combination lock on the front, if it is not triggered, outsiders will not be able to see it at all.

In their eyes, it is just a small shape and exquisite box. In addition to the two lines of shocking words, the front and back of the box are flat and neat, comfortable to handwork, but nothing else.

Only when Youzishi puts his hand on the fingerprint reader in the dark on the back of the box and is successfully recognized, the nine-square grid electronic screen on the front will be opened, and the correct order or garbled characters will be randomly displayed, and the nine grids are filled by 1 to 99 numbers respectively.

At this moment, the nine-square grid is out of order.

"Little monk, do you know this, I'm afraid even your father won't be able to solve this problem, if you learn it, how majestic it will be in front of him......"

"Really, then I'll test him again after I learn it!"

"Well, you see, this is a nine-square grid, you have to fill in the nine numbers from 1 to 9 in these nine grids, to ensure that the sum of the three numbers above each row, each column, and each diagonal, is the same, come, I will teach you how to do it, first of all, to ensure that the conditions are met, it is very simple, the five in the middle of one to nine must be taken out first, and put in the middle grid......"

"Then let's calculate the sum of the three numbers in each row, in each column, and on each diagonal, and if this number is equal, how much is it...... （1+9）*9/2/3=15……”

You Zishi began to explain to the little monk how to solve the ideas and methods of the nine-square grid, and how fun it should be after this question is derived.

But after talking a lot, the little monk was quite excited just now, and wanted to learn to make it difficult for the old monk to show off his IQ in front of his father, but he didn't expect that he immediately flattened his mouth and was dumbfounded.

"It's too hard, I don't understand ......"

You Zishi was stunned for a moment, too, he talked about so many principles and ideas, what turtle shells, what river Tuluo books, and a variety of solutions, it may really not be the appetite of a second-grade child, if you want him to understand this problem from the level of logic and understanding and mathematical origins, I am afraid that it will be a little difficult for him, it seems that he can only take a step back.

Let's not talk about understanding and drawing inferences, let's teach him this classic nine-square grid for the time being, remember that the melon is ripe, and it is estimated that it is enough.

So change the way you play.

The wandering poem restores the numbers in the nine-square grid to the normal order.

That is:

123

456

789

"Little monk, you see, you remember it like this, let's say this is a certain side of a Rubik's cube, let's first arrange one to nine from top to bottom, from left to right, this is the first step......"

"Hmmm......"

"The second step is to swap the numbers on the four diagonals up and down, 1 and 7 and 2 and 9 to exchange positions, and it becomes like this......"

729

456

183

"The third step is to swap the numbers on the four diagonals left and right, 7 and 9 to exchange positions, 1 and 3 to exchange positions, and it becomes like this......"

927

456

381

"Okay, now it's the last step, imagine that this is a side of the Rubik's Cube, and move each number on it clockwise down one square, in fact, it is the number on the outer circle, and it becomes ......"

492

357

816

"Dangdang, this is a success, do the math, each row, each column, and the three numbers on the diagonal add up to exactly fifteen ......"

"Really, brother, you're so good......"

"How's it going, will you?"

"Nope. ”

You Zishi then spoke again, and then asked him to come by himself, and after trying two or three times, sure enough, the little guy would be able to, and he remembered it quite solidly.

To put it bluntly, there are four steps, the first step, do it in order, the second step, the diagonal four numbers are exchanged up and down, the third step, the diagonal four numbers are exchanged left and right, and the fourth step, the outer circle numbers are moved clockwise to the right in turn.