How to break into a math book

The countdown was jumping crazily, but Tu Hua's head was a mess.The underwater environment was already quite depressing, coupled with the speeding up of time, he, who had always been calm in situations, became inexplicably irritable at this moment.

It seems that there is a resentment that is always pressed in the bottom of my heart, wanting to get angry, wanting to use violence as an outlet.

This is so abnormal.

The fist was clenched unconsciously, but when Tu Hua saw his arm, his hairs stood on end.From the time he entered the water, his body had undergone some fish-like changes, such as growing gills and webs, and there were some thin fins on his arms.But after a while, the scales on the back of his hand seemed to become denser.

He quickly opened his palm, only to realize that his fingers had disappeared.The entire palm has turned into the shape of fish fins, and diagonal fins have also begun to grow between the arms and body.

How is this going?

"I forgot to tell you, since you entered this water, you have been cursed by the witch." The witch was jumping beside him, with a vaguely sympathetic expression, but Tu Hua saw a dangerous gleam in her eyes , "You will gradually become a fish. If you can't successfully divide the 23 cards into two piles, you will completely become a monster who is neither human nor fish, unable to control your behavior and emotions, instead of I became a witch."

"And I am free." The witch's gentle expression no longer exists, and her smile has become sinister.

Tu Hua looked at her in astonishment.No wonder he felt restless. It turns out that there is another restriction in this level, that is, if you don't answer for a long time, you will be trapped here forever and become an NPC who has lost self-awareness!

The situation was so severe that he couldn't think much about it, so he quickly threw himself into the topic.

There are 23 cards with angels on the front and devils on the back, 10 of which are face-up and the other 13 are back-up.In the case that he cannot see the contents of the cards, he must divide the 23 cards into two piles, and ensure that the 10 face-up angel cards are evenly distributed in the two piles, with five cards in each pile.

The painting is simply a mess.He couldn't see the contents of the cards, that is to say, he didn't know which one was the face-up angel card and which one was the back-up devil card.Is this level for the challenger to gamble on luck?

This is absolutely impossible.This is a math breakout game, not a gambling game. All problems must have accurate solutions.

It is more and more obvious that the body is becoming fishy, ​​and it is becoming more and more difficult for Tu Hua's mind to calm down.Do I really want to become an NPC and be trapped in this level forever?

"Reverse thinking, Tuhua, you can definitely do it."

The witch who was gloating just now actually comforted him?Tu Hua raised his head in disbelief, and the witch immediately put on that evil expression again: "Look at you, you're about to grow a fish tail!"

Tu Hua looked at her strangely, is this witch still a genius?

But the witch's words reminded him.

Reverse Thinking.

Tu Hua closed his eyes and rearranged the 23 cards in his mind.If he can see the content of the cards, he will definitely put 5 angel cards in each pile first, and then distribute the remaining devil cards.It doesn't matter if you only have 1 devil on one side and 12 on the other, because the rule is as long as you have an equal number of angels on both sides.

But all of this is when he can see the cards.When almost everyone gets this question, what they think about is how to divide the 10 angel cards evenly if they can see the cards.

This is a normal way of thinking, what is reverse thinking?

Reverse thinking is to reverse all conditions.The rule of not being able to see the content of the cards seems to be a restriction, but if you look at it the other way around, it is the key to solving the problem.

All cards have front and back sides, and the even distribution does not mean that the 10 cards must be divided equally.It is precisely because you can't see that there is a possibility of flopping!

Tu Hua suddenly realized: "I know how to do it!"

The witch froze for a moment, and saw that Tu Hua randomly divided the 23 cards into two piles, with 13 on the left and 10 on the right.

Then, he turned over the 10 cards on the right one by one.

Even though his body is covered with fish scales at the moment, his expression is still confident and calm: "This topic is actually very simple, but we all fell into a fixed mindset at the beginning. Although it seems that I was blindfolded and couldn't see The content of the card, but in fact this restriction has opened a skylight for me."

"There are 10 face-up angel cards, but it doesn't mean there are only 10 angel cards. Any of these 23 cards can be an angel card, because the angel and the devil are in between flips."

"We just need to divide one pile into 13 cards, and the other pile into 10 cards. Suppose there are x angel cards in the pile of 13 cards, and there are currently 10 angel cards in total, which means the other pile of 10 cards There are 10-x angel cards. Then just turn over all the 10 cards, the angel on the front will become the devil on the back, and the devil on the back will become the angel on the front. There are a total of 10-(10-x) angel cards in the pile of cards, that is, x angel cards."

"x=x, so there are as many Angels in the pile of 13 as there are in the pile of 10."

【Ding--】

[Congratulations on clearing the witch's gift level and getting a reward item: Mermaid's Tears. 】

In an instant, the cards that were painted and divided into two piles were neatly arranged on both sides, and the contents of the cards were slowly revealed.Tu Hua walks through the middle of the two rows of cards. Among the 13 cards on the left, there are 6 angel cards and 7 devil cards. Among the 10 cards on the right, there are 6 angel cards and 4 devil cards.

Angel cards are equal in number.

The fish scales and fins on Tu Hua's body gradually disappeared, his fingers regrown like sprouts, and the gills beside his ears became lighter and lighter.He stood outside the passageway formed by two rows of cards, watching the witch quietly.

For some reason, he always felt that this witch was weird.

The witch walked slowly between the two rows of cards, and the 12 angel cards suddenly shone with dazzling golden light on her.In an instant, the witch's flowing blond hair began to turn black, and her squirming tentacles became legs. The witch disappeared, and a human girl stepped out of the golden light.

Tu Hua looked at her in surprise: "Sun Wei, why is it you?!"

The two who lost their gills could not last long underwater, and soon found it difficult to breathe.The seabed, which was still dark just now, suddenly had light coming in. Tu Hua looked up, and vaguely saw the roof of the swimming pool through the water.

The two quickly floated up, and soon got out of the water. This is the swimming pool where Tu Hua disappeared from his coma.

After landing on the shore, Sun Weicai said, "Thank you for saving me."

The high-cold Xueba who always had a frozen expression finally showed him a grateful expression, and Tu Hua was flattered.Without Sun Weiduo's explanation, Tu Hua guessed the reason: Sun Wei must have also been involved in this level, did not answer the question for too long, and was forced to become an NPC witch.

If Tu Hua hadn't thought of a way to turn into a fish completely, he might be the one who replaced Sun Wei underwater at this time.

Sun Wei seemed to feel sorry for his behavior when he was a witch, and explained: "I said those words...not on purpose. After becoming an NPC, the system will control my words and deeds. I have no way to escape, and there is no way to give The challenger reminds me that I will involuntarily say the lines set for me by the system. If you get the wrong answer at the time, you will be eliminated, and I can only continue to wait for the next challenger; if you don’t answer, you will eventually become a mermaid. You will replace me as a witch, and I will be eliminated."

The level that can make a top student stumble is really not an ordinary pervert!

Tu Hua called up the system screen, and wasted too much time in the underwater level at ten times the speed just now, his time countdown was only 29 hours left there.But there is a strange prop: mermaid tears.

Like Mr. X's favorability, Tu Hua was at a loss and didn't know how to use it.Take the mermaid's tears out of the system backpack, a small glass bottle with a slightly bluish liquid inside.

"When I was a witch NPC, the system vaguely mentioned the usage of this item." Sun Weidao, "You have to drink it."

"Drink it? Will it have any effect?"

Sun Wei shook his head: "Then I don't know."

She called up her system screen, and Tu Hua saw that her time was counting down. There were only two hours left, and it must have been too long in the witch's checkpoint.Sun Wei was not in a hurry, his expression was still calm, he wiped off the water on his body with a bath towel, stood up and said, "I should go."

"Wait." Tu Hua scratched his head, he always felt that the gap between himself and Sun Wei was too deep, and he had to find a chance to clarify.If they can untie their knots, they might become friends and break through the barriers together.

"What happened before...I'm sorry, if I hurt you, I apologize to you."

With his back turned to him, Sun Wei couldn't see the expression on his face: "It's all over, I've forgotten it a long time ago."

"What I said at the time was true, not an excuse." Tu Hua said suddenly, "I really don't like girls. But I think maybe we can be friends?"

Sun Wei paused, turned his head slightly to look at Tu Hua, and left the swimming pool without responding.

Tu Hua was a little frustrated, but it was understandable, after all, no one could let go of this kind of hurting self-esteem so easily, let alone a schoolmaster who has always been aloof.

Still holding the bottle of mermaid tears in his hand, Tu Hua unscrewed the cap, thinking that since it was a reward item, it must have its effect, so he downed it in one gulp.

The fishy sweetness entered his throat, and a hot heat surrounded his body, and finally gathered in his eyes.Tu Hua unconsciously rubbed his eyes, and when he opened them again, he was stunned by the scene in front of him.

There are a few white words floating in the air in two places in the stands of the swimming pool: [Submission: Phantom of Numbers] [Submission: Happy Sicily]

Looking out along the entrance of the swimming pool, I happened to be able to see the library. There are also densely packed words floating on the roof of the library. Most of them are about side missions, and there is a line of red words in the middle: [Main line Mission: Mr. X's Maze]

Tu Hua hurriedly ran out and looked around the school. Almost all the places he looked at were marked with text, and the task category and name were clear at a glance.

So... that mermaid's tears can let him see what tasks are there in the school?This is simply hanging, right?

The author has something to say: Can you understand the card problem? XD