How to break into a math book

"Who told you to move my camera?"

The voice seemed to be cold, and it penetrated into Tu Hua's collar.Tu Hua froze all over, the hairs on his back stood up, his mind went blank, and he quickly hid behind Su Gechi without even thinking about throwing down the camera.

He didn't even dare to open his eyes, and tugged at Su Gechi's arm tremblingly.

Su Gechi quickly patted him on the back comfortingly, and then said to the man, "Don't scare him."

Hearing the gloomy voice just now, he suddenly became aggrieved: "I didn't scare him... I just asked him why he took my camera..."

Tu Hua was so nervous that his heart was about to jump out of his throat, and then he opened his eyes cautiously, poked his head and glanced at the source of the sound, as if he was afraid that there was a scourge facing him.

That person was the young man holding the camera in the picture frame of the restaurant.He picked up the camera that Tuhua threw on the ground, patted the dust carefully, opened it again and checked it before he was relieved, and muttered: "Fortunately it didn't break..."

Only then did Tu Hua see his appearance clearly.He has a ruddy complexion, regular facial features, walks down-to-earth and does not float or float. He does not look like a ghost in his imagination at all. He should be a human being.Tu Hua breathed a sigh of relief, came out from behind Su Gechi, and asked him with lingering fear: "Why do you pretend to be a ghost to scare people?"

The young man holding the camera looked at him exaggeratedly: "Where did I pretend to be a ghost?"

Tu Hua pointed his finger at him and accused him: "The newspaper on the coffee table proves that you are dead, there is still a painting of you standing in the cemetery with a pale face next to the dining room, and this house is full of dust, it seems that no one has been there for a long time. I stopped, but suddenly someone stood behind me and spoke, who else could it be except ghosts! Can I stop thinking about you scaring people like this?!"

The young man also snapped his fingers to refute him: "The person who took the photo in the newspaper is not me, the photo in my camera is just a copy from someone else, I just want to learn the technique of framing; what do you think of the pictures in the restaurant? The horror is because you don’t understand art at all, you don’t even know the gothic style of picture processing; in the end... dust in the room? Brother, this old castle is so big, I live alone, and I will be exhausted cleaning it every day !"

"Finally," the young man pointed in the direction of the restaurant, "you have already walked to the restaurant, why don't you go to the kitchen and take a look? Maybe you won't be so scared, because you can definitely see instant noodles being cooked in the kitchen me."

Tuhua: ...

Tu Hua poked Su Gechi next to him shamelessly, and whispered: "Didn't you say that there is a ghost in this level?"

"I just agree with your statement about the haunted house, which doesn't mean there are ghosts." Su Gechi shrugged innocently, "After all, this is a scientific game that conforms to the core values ​​of socialism. How could there be feudal superstitions?"

Tuhua: ...

The end result was that Tu Hua and the two returned to the restaurant with the young man, watching him eat instant noodles and listening to him tell stories at the same time.This old castle is an inheritance that this young man got from his ancestors. After he moved in, he found that the gate was locked with a strange lock. You need to press the correct button to open it. There is only one chance. Once you press the wrong button, the castle will be closed. The automatic protection system will be activated, and there will never be a way to open it.

And the photo in his camera was the first clue he found.The young man sucked his face, raised his head and said to Tu Hua: "Next, you must find the other 4 clues on your own, or you will stay with me in the castle forever."

Tu Hua couldn't help smacking his lips: "You're still the first NPC I've encountered who needs a challenger to rescue."

The young man looked at him excitedly: "Then am I special?"

"That's right." Tu Hua was still suffocating the anger of being frightened, so he retaliated, "It's very useless."

youth:……

Not long after, Wang Boyu rushed down from upstairs. He seemed to have found some clues, and excitedly called Tu Hua's name.When he saw the young man who was eating noodles, he froze for a moment: "Who is this?"

"A useless NPC." Tu Hua stood up and followed him, "Where is the clue you found?"

Wang Boyu led him to the second floor, looking back at the instant noodles in the young man's bowl from time to time, and said greedily, "I also want to eat..."

Tu Hua: "If you eat too much instant noodles, you will become as useless as him."

The young man held his face in tears, and said to Su Gechi who was sitting opposite him: "Why is this challenger like this?"

Su Gechi stood up and prepared to follow them, and smiled at the young man, "I think it's very cute."

youth:……

The clue Wang Boyu found on the second floor was a telephone, and a note was pasted next to the phone: [Multiply this phone number by 5 and add 6, then multiply the sum by 4, add 9, and then multiply Subtract 5 from the result obtained by 165, and cover the last two digits of the final result to return to the original number. 】

The hint on this note seems to be asking the challenger to deduce the phone number based on lengthy calculations.Wang Boyu is almost the same as the first two: "I think the phone number must be a clue. It is very likely that we are asked to use this phone to dial this number, and then the other end of the phone will tell us the clue. But this time, it will be multiplied, added, and subtracted. , we don’t even know the number of digits in the phone number.”

Tu Hua also felt a little confused.First of all, they don't know how many digits the phone number is, and secondly, if they want to find a number that matches the calculation program on the note when everything is unknown, it is simply looking for a needle in a haystack.

This question is not unsolvable at all, but it makes people look at it and don't want to do it.

Wang Boyu was also a little annoyed: "Why don't we forget about this clue and let's go find something else?"

Tu Hua frowned: "But there are only five clues in the whole house, and all of them are indispensable. This question... no matter how disgusting it is, you have to figure it out."

Tu Hua stroked his chin, staring at the numbers on the note in thought.

The complexity of this question does not seem to be the style of "Mathematical Breakthrough".All the way to the present, Tu Hua has already figured out the routine of this game. The level problems encountered may seem difficult, but in fact there will be an unexpected result.

So this question...is it the same as before?

Tu Hua silently checked the numbers on the note.First, multiply the phone number by 5 and add 6. The result is calculated once, multiplying by 4 and adding 9, and then performing a third calculation, multiplying by 5 and subtracting 165.All the previous calculations are simple one-digit natural numbers, only a three-digit number 165 pops up at the end... Could it be that the problem lies in this 165?

Tu Hua took out two pieces of draft paper from the side drawer, and prepared to do some calculations.

首先假设这串电话号码代表的数字为x，那么经过乘5加6的第一轮演算之后，这个数字就变成了5x6。接着在5x6的基础上进行第二轮演算，即对5x6乘4加9，也就是（5x6）×49，去掉括号演算之后就变成20x33。

Finally, the calculation of multiplying by 20 and subtracting 33 is performed on 5x165.

Tu Hua finally understood the profound meaning of this question, and it really was a question that required a sharp brain twist! (20x33)×5-165 After removing the parentheses, the obtained formula is 100x165-165, and the two 165 cancel each other out. This series of seemingly lengthy calculations actually only obtains one result at the end, which is to multiply the original number Take 100, which is 100x.

And the last sentence of the note says "cover the last two digits of the final result to return to the original number", for 100x, no matter how big the number x is, the last two digits must be 0.

The 0 covering the last two digits will become the original number, which means that this phone number can be any string of numbers, and this calculation process will not have any impact on it.

Hearing Tu Hua's explanation, Wang Boyu also understood: "That means we can just dial any phone number, right?"

Tu Hua nodded.

Wang Boyu immediately picked up the phone, randomly pressed a series of numbers on the keyboard, and sure enough, a mechanical female voice came from the receiver: [B button is the third to the right of C button].

Tu Hua was stunned for a moment. The last message he got was [A is to the left of B]. At that time, he subconsciously judged that the six buttons were arranged in the order of ABCDEF, but it was not until the second message appeared.

B is the third on the right of C, which proves that C is the third on the left of B. If the order is from left to right, it is impossible for C to be on the left of B.So his assumption in the first round was wrong.

Wang Boyu took the paper on the table, combined with the first piece of information that Tu Hua told him while writing and analyzed: "A is on the left of B, and B is the third on the right of C, which proves that A is ranked between B and C. In the middle of the middle. According to this order, we can roughly arrange it, and we can get the order of C, A, X, B, X, X or C, X, A, B, X, X."

Tu Hua nodded: "Yes, but we don't have all the information, and we can't guarantee that C is the first button. There may be one or two buttons in front of it."

The two decided to find other clues as soon as possible.Wang Boyu searched the entire second floor just now, and only found this one clue. This time they plan to act together and go to the third floor first.

There are 7 rooms on the first floor of the third floor, most of which are abandoned guest rooms or servant rooms. There is nothing in them except beds and wardrobes. Only one room near the corner of the stairs looks very weird.

Clocks are everywhere in this house.

There are European-style carved wall clocks, mechanical balance clocks, and various electromagnetic quartz clocks and electronic clocks.The walls are full of clocks, and the ground is also full of clocks. The time of all the clocks is exactly the same, and even the beating of the second hand is uniform.

Hundreds of thousands of second hands moved together, and the tiny ticking sound became a loud booming sound.The two visited the clock room curiously. Each clock seemed to tell a story of an era. Various clocks in line with the characteristics of the times and regional styles gathered together, like a scroll of time.

Tu Hua was still immersed in the long river of time and admired, when Wang Boyu said in surprise: "Tu Hua! Come and see this clock!"

Looking in the direction of Wang Boyu's finger, there is a rectangular plaque that looks very inconspicuous in the corner of the wall.He doesn't look like a clock, and there is nothing related to the time pointer on the card, only four lines of strange calculations.

【2436=1】

【1113=1】

【158207=1】

【4654=1】

"This should have something to do with the clues, right?" Wang Boyu scratched his head, "These equations are really strange, the two sides of the equal sign are not equal at all."

No matter how the results on the left side of these four formulas are calculated, it is impossible to be equal to 1 on the right side.Tu Hua squatted down to observe this strange plaque by himself. What is the significance of it being mixed with so many clocks?And what do the four formulas on his card represent?

Wang Boyu frowned and thought: "Could it be a brain teaser or something like that, let us move a number or symbol so that the numbers on both sides are equal?"

After speaking, he tried the first equation and found that no matter how he moved the numbers and symbols, both sides of the equation could not be equal.Wang Boyu was confused, and even wanted to dig open the plaque to see if there were any hints inside.

Tu Hua also feels that if this is a topic, the information is obviously not complete.A topic should not only have a stem, but the most important thing is the question.Only when the question is asked can the answerer know what the question wants to do.

Wang Boyu simply sat on the ground, fiddled with it for a long time but still couldn't figure out the reason for the plaque, and said a little frustrated: "Is there really no other information?"

Tu Hua sat down side by side with him, the ticking of the second hand next to his ears disturbed his mind.

Wait...time? !

The plaque was inexplicably placed in a room full of clocks, and he didn't seem to have anything to do with the clocks.But if this is really a reminder message, it must give clues to the challenger.If it is placed in a room full of clocks, it must be related to time. Otherwise, this plaque can be placed anywhere, and there is no need for the system to set up such a complicated environment for it.

At the same time, Wang Boyu also discovered the problems in these four equations. He got up excitedly, pointed to the calculation formula on the plaque and said: "Look, in the first formula, 2436 happens to be equal to 60; in the second formula 1113 is also exactly equal to 24; 158207 is exactly equal to 365; 4654 is also exactly equal to 100. The results of these four calculations seem to have nothing to do with 1, but to some extent, they are 1."

Tu Hua's eyes lit up instantly: "Time."

Wang Boyu nodded and said excitedly: "60 minutes is exactly equal to 1 hour, 24 hours is 1 day, 365 days is a year, and 100 years...is a century."

Tu Hua squatted in front of the plaque, gently brushing the dust off the plaque with his palm: "So these four equations actually allow us to find the units that make them equal. We are in a house filled with time, and time is It is a prompt given by the system."

The dust on the plaque was wiped off bit by bit, and the numbers on the plaque became clear.At the same time, there is a small scroll wheel behind each number, and after the dust fades, the shape of the scroll wheel is also revealed.

Tu Hua tried to touch the first roller, and found that there were different numbers printed on the roller: "minute, second, hour, day, year". Tu Hua quickly moved the rollers behind the four equations to the correct position , finally got the correct answer.

24 (minutes) 36 (minutes) = 1 (hour);

11 (hour) 13 (hour) = 1 (day);

158 (days) 207 (days) = 1 (year);

46 (years) 54 (years) = 1 (century).

After all the units were ready, there was only a "click", and the plaque that was originally tightly stitched was suddenly opened.

Wang Boyu said in shock: "No wonder I didn't turn it on for a long time just now, so there is a mechanism!"

There was a piece of paper in the gap between the plaque. Wang Boyu took out the note, and it really gave the third piece of information about the button: [C button is on the right side of D button].

The two quickly combined the third piece of information they got with the first two pieces of information, trying to further analyze the answer.

Wang Boyu said: "Just now we have guessed that the six buttons are in the order of C, A, X, B, X, X or C, X, A, B, X, X, but we are not sure whether C is in the first place or not. One, so it could also be X, C, A, X, B, X or X, X, C, A, X, B and X, C, X, A, B, X or X, X, C, X , A, B in this order."

"Now we know the third piece of information: C is on the right of D, which proves that the first two conjectures must be wrong. D will be in front of C, and whether it is one or two in front still needs to be judged. "

Tu Hua nodded: "So based on the three pieces of information, we can conclude that D is the first two digits, that is, there are six possibilities in total: any button in front of C may be D, so we need to make further judgments. "

Having obtained three pieces of information, the two were full of confidence and decided to look for the next clue immediately.

But this old castle is really too big. They were very lucky to find the prompt information on the first, second and third floors, and then they were not so lucky.The two searched through three more floors, but did not find any useful information.

Just when they thought they might have missed something in the three floors just now, they came to the study on the top floor.

This study is exactly what Tu Hua dreamed of.Tu Hua liked reading since he was a child, and went to the library to study every week. But for anyone who loves reading, owning a study room that can store thousands of volumes is the ultimate dream.

Tu Hua didn't expect that he saw the place he dreamed of in the game.

The entire top floor has been opened up, with an area of ​​three to four hundred square meters. It is not so much a study as it is a library.Pushing open the door of the study room, starting from the wall of the door, a whole circle is placed on the bookshelves that reach the height of the building. Every bookshelf is full of books, which is overwhelming.

There is also a black lift next to the bookshelf. When you can't reach the books on the top floor, you can climb up by stepping on the ladder.Tu Hua wandered around the study enviously. Even the books on the bookshelves were made realistically and classified very carefully, such as history, humanities, science and technology, philosophy and so on.

Tu Hua even thought that if he couldn't leave the game, let him die in this study.

Some of these books are already very old, Tu Hua couldn't wait to pull out one, wanting to see if the contents in the book were true.

At this moment, Wang Boyu discovered some problems.

This clue is very obvious, but unfortunately the person next to him died after seeing the book, so he didn't notice it at all.He had no choice but to poke his head and look up: "Look at the book on the top floor!"

It was only then that Tu Hua noticed that these books also functioned as puzzles.I saw that the spines of some books on the top floor were all red, but there were some white spines between them, which happened to be red and white, spelling out a few letters:

【QE】

【AS】

【Z】

And these letters are not next to each other. The whole red area can be divided into three lines, roughly forming a square shape.The first line is the two letters Q and E, and there is a space between Q and E. According to the size of the letters, another letter should be filled in the space.

The second line is the two letters A and S, which are next to each other, leaving a space behind them.The third row has only one letter Z, right at the front, leaving space for two letters after it.

So the basic shape of those five letters is roughly:

【Q_E】

【AS_】

【Z__】

Although Tu Hua was obsessed with the huge study room and couldn't extricate himself, the letters spelled out of books were too obvious, which must contain the information they needed.

But what do these five letters want to express?Is it up to the challenger to use them to form a letter, or to sort them?Or to find out a few books representing letters, and the information they need exists in the books?

Another question without questions.Tu Hua was confused and decided to climb up to have a look.Adjusting the elevator to a suitable height, Wang Boyu supported him, and Tu Hua climbed up to check the situation.

Soon he found that the covers and spines of these books had no content. The covers of the books spelled out in letters were all white, while the books with a red background were red, and there was no useful information on the covers.

Is the information in the pages?Tu Hua opened a book, but the inside of the page was exactly the same as the book cover, completely blank.

Wang Boyu supported the ladder and said with a smile: "I didn't expect the owner of this ancient castle to pretend to be a king. I thought he was very knowledgeable, but he was full of wordless books!"

Tu Hua felt that things were not that simple.He just flipped through the books on other bookshelves. Those books obviously have content, but why is there nothing in the one that provides information?Now that the system has taken the trouble to set up such a library, it is really unreasonable to set up blank pages for books with important information, especially for the content provided for each book.

So he felt that these books must have what they needed.So he started flipping through the first book one by one. After an unknown period of time, Wang Boyu, who was leaning on the ladder, almost fell asleep. Finally, Tu Hua found the content in the middle book.

I saw five big characters written on the title page of this book-"Computer Principles".