(This is the second update of today's guarantee, which is actually the third update.) ）――

When Aunt Ying heard this question, one head was suddenly bigger than two. She hurriedly took out the calculation chips she carried with her and calculated: "Each soldier has three more buckets, the fifth soldier is fifteen buckets, the sixth soldier is eighteen buckets, and the seventh twenty-one buckets...... The eighth twenty-four bucket ......" She counted them one by one, and after a while, her hair turned gray again, and sweat flowed down her face.

It took a long time for her to count fifty soldiers, and she was already sweating.

Li Yan said with a smile: "You can't do this, this is a difference in the number of equal numbers, the difference between every two soldiers is three buckets of rice, and there are 179 intervals between 180 soldiers, that is, 179 times 3, since the first soldier starts from 3, so Zuihou's answer is 179 times 3 plus 3, Zuihou's answer is 540, that is, five hundred and forty buckets of rice." ”

As soon as these words came out, Aunt Ying was shocked, she quickly followed Li Yan's train of thought and thought it again, and sure enough, it suddenly came through, there was no need to add them one by one, as long as she found the law, she would naturally be easy to solve.

She exclaimed, "Equal difference series...... It's a new mathematical term, and I'll have to write it down quickly. The difference series can be multiplied by the interval number, and the answer can be easily obtained, high-minded, really clever......"

Speaking of this, she glared at Li Yan and snorted: "You know this equal difference series, and it is not necessarily better than the arithmetic of "The Map of Heluo", this question alone is not enough to prove anything." ”

Li Yan wanted to convince her, so he smiled and said, "Then let's change this question slightly, the topic is still the same as just now." Give rice to the soldiers. But now the question is not how many buckets of rice should be sent by the 180th soldier. But...... How many meters do all the 180 soldiers need to send in total? ”

When Aunt Ying heard this, her face suddenly changed miserably, her mind turned around, and then she trembled and said: "The first soldier has three buckets, the second soldier has six buckets, and three plus six equals nine." The third soldier has nine buckets, and nine plus nine equals eighteen. The fourth soldier is twelve buckets. Eighteen plus twelve equals thirty ......"

She counted for a while, and only twenty or thirty soldiers did it, and then she made dozens of additions, and one head became two big, sweating profusely, and her hair turned gray a few times.

She couldn't help but say to Li Yan: "This ...... Isn't this kind of question a toss-up? Just now I only counted how many meters the 180th soldier needs to send, and you can quickly calculate it with the trick you said, but this time you want to add up the meters of the 180 soldiers, it is impossible to have a trick, right? ”

Li Yan Haha smiled: "Of course, there are tricks. This is called 'summing of equal difference sequences', and there is a formula available. As long as you substitute that formula, you can quickly come up with the answer, if you teach me loach skills, I will teach you all the arithmetic formulas I know, which is guaranteed to be much more useful than this "Map of Heluo", believe it or not? ”

Ying Gu and Li Yan first met, how could they believe him so easily? She still believed in "The Picture of Heluo" more, hesitated for a while, and hesitated.

Li Yan opened the "Picture of Heluo", turned to the page of the nine-square grid, and then drew a nine-palace map on the ground with charcoal, the so-called nine-palace map, in fact, is a game of filling in the numbers, filling in the nine numbers of the 123456789 in the nine grids, to ensure that the sum of the three numbers of horizontal, vertical and oblique is equal.

Li Yan said with a smile: "This is the nine-square grid, a more advanced topic in the picture of Heluo. ”

Ying Gu hurriedly nodded and said: "That's right, this is also the most important arithmetic problem for deducing the changes in the formation, if you can master the Nine Palace Grid, you can be at ease in any complex Qimen Five Elements Formation, calculate the birth gate and death door, all the changes in the formation, and you will not be trapped by the formation." ”

Li Yan smiled: "This is just a pediatric question, come, I'll show you something more interesting." After saying that, he drew a huge table on the ground with charcoal, including nine nine squares, for a total of nine hundred and eighty-one squares.

When Aunt Ying saw so many grids, she immediately panicked and exclaimed, "What is your problem?" Why do you draw nine squares? ”

Li Yan said with a smile: "This is called 'large number reading', on the basis of a nine-square grid, expand into nine nine-square grids, and fill in the numbers from 1 to 9 to ensure that each horizontal and vertical column has 123456789 these nine numbers and cannot be repeated." ”

Aunt Ying was dumbfounded: "This ...... This...... So hard? ”

Li Yan said with a smile: "This is not difficult, it is just a very simple topic, if you can read the number well, all the changes in the nine-square grid can be understood, then no matter what the five elements formation, no matter how it changes, it will not be difficult for you." In fact, reading numbers is not arithmetic at all, if I teach you seriously, the sum of the equal difference series is just a small problem, and what hyperbolas, parabolas, and those magical formulas you have learned, no matter what formation, it seems to you that it is just commonplace. ”

Ying Gu was shocked by the huge number reading table, she finally believed that the arithmetic recorded in "The Map of Heluo" was not as much as Li Yan knew, and there was no hesitation at the moment, so she bowed down to Li Yan and said excitedly: "Ask my junior brother to teach me arithmetic......

Li Yan smiled and said: "Okay, okay, Senior Sister Ying, you go back first, every evening after school, you come to my dormitory, and I will teach you arithmetic in one class." ”

Aunt Ying was overjoyed, quickly thanked Li Yan, and went happily, before leaving, she also took a piece of paper and copied back the number reading that Li Yan drew on the ground, and this number reading problem seemed to be enough for her to enjoy.

Li Yan thought to herself: She studied arithmetic so hard, is she also going to Peach Blossom Island to crack the mechanism formation and rescue the old naughty boy Zhou Botong? Probably not, my intuition tells me that Zhou Botong is a woman.

Thinking too much was useless, Li Yan took the hand of the ponytail girl and seriously looked for the cheats he wanted to learn.

On the bookshelf of high-level martial arts, there are not many cheats, compared to the bookshelves of low-level and intermediate-level, they can only be described as sparse, which shows that the more advanced martial arts, the less! Most kung fu is mediocre and ordinary, and it is far from advanced.

Li Yan saw a copy of the cheats of "Dragon Capture Gong" in front of him, which was a kind of kung fu that took things from the air, which was quite powerful. In the book "Dragon Babu". Qiao Feng has used the Dragon Snatching Skill. With just one wave, the enemy's weapon flew into Qiao Feng's hand, which was really cool and violent, it could be said to be a kind of fantasy kung fu.

Li Yan thought: This kung fu can be cool, and it is also very suitable for ponytail girls, I can practice with her, I might as well borrow it, so I put this cheatbook into my arms.

In a blink of an eye, I saw the True Sword Technique on the shelf next to me. Li Yan thought to himself: I practice Quanzhen internal skills, but I have not practiced Quanzhen swordsmanship, if this set of swordsmanship is combined with Quanzhen internal strength, theoretically speaking, it should be much more powerful than Songfeng swordsmanship, you might as well borrow it to learn it, so I reached out and took it down.

Zuihou still has a place, and Li Yan began to suffer from gains and losses, looking at the shelves full of good books, I don't know which one to borrow. At this time. He suddenly thought of Aunt Ying, who had just left, and his heart couldn't help but move. Secretly thought: Aunt Ying learned arithmetic in order to learn the formation of "Qimen Five Elements", Qimen Five Elements This thing is mysterious and mysterious, I always thought it was fake before. But in martial arts shijie, it's undoubtedly true. For example, Peach Blossom Island has a formation, and in the book "The Condor Heroes", Huang Rong also used small stones to set up a formation to resist the enemy.

For ordinary martial arts people, the Qimen Five Elements are very difficult, and they can't even get started, because the Qimen Five Elements need mathematics as a foundation, but most of the ancient people's mathematics is very bad. Looking at all Jin Yong's martial arts novels, only Huang Yaoshi, Huang Rong, Yinggu, and Cheng Ying study mathematics, and others are afraid that they can't even do multiplication and division.

But for Li Yan, a full-score man, the Qimen Five Elements is a very easy thing to learn, because the full-score man's mathematical foundation is much more powerful than that of people in this plane, and he is sure that even if Huang Yaoshi sits in front of him and calculates math problems together, he can finish the violence, let alone Huang Rongyinggu or something. If they can learn the five elements of Qimen, then Li Yan will definitely be able to.

For Li Yan, who is lacking in skill, many high-level martial arts cannot be practiced, such as the magic power of the fingers, Li Yan is absolutely unable to practice now, but the five elements of Qimen do not need the foundation of internal strength, as long as they can calculate the five elements of yin and yang, they can be proficient.

After making up his mind, Li Yan searched for a while on the bookshelf, and finally found the book "Qimen Five Elements" in an inconspicuous corner, this book has obviously been ignored for a long time, and a thick layer of dust has accumulated on the spine, Li Yan took it off, blew off the dust, and held it in his hand and couldn't put it down. I thought: As long as I learn this, I can also be like Huang Rong, against opponents who are much more powerful than myself, even if I can't beat it, I can defend it with a formation.

The ponytail girl was happy to see him, and she was also happy: "Classmate Li Yan, have you made a good choice?" Let's go check in with the librarian. ”

Li Yan nodded and said with a smile: "It's chosen, let's go, let's go find Miss Wang Yuyan." ”

The two searched for a long time in the Scripture Pavilion, and searched every corner, but they still couldn't find Wang Yuyan, and the ponytail girl couldn't help but wonder: "She won't go to the toilet, right?" ”

Li Yan shook his head: "It's strange, she wasn't there when we came." We discussed arithmetic with Aunt Ying, and looked for the books we wanted to borrow, which delayed a lot of time, not to mention going to the toilet, even if she took a bath, she finished washing, right? Why haven't you come back yet? This is a strange thing. ”

The ponytail girl's face suddenly turned red, and she said in a low voice: "She can't hide in the grove and have a tryst with the boy she likes, right?" ”

Li Yan Khan: "Wow, if Wei Xiaobao says this, I think it's normal, why do you say this kind of joke?" ”

The ponytail girl's face was as red as blood, it turned out that she thought of herself, she used to always practice boxing in the grove, and she could be found in the grove at any time, but recently, as long as she was not in the grove, she was around Li Yan, so she thought about Wang Yuyan's affairs crookedly.

Li Yan thought of the name Murong Fu, and thought: What the ponytail girl said is not impossible, I wonder if Wang Yuyan really went to have a tryst with Murong Fu.

He looked left and right, and saw that there was a dense forest behind the Scripture Pavilion, so he said to the ponytailed girl: "Let's go, let's go to the grove to find out if she is really having a tryst with a man." ”――

Diary of a Lonely:

I used to be so lonely, without a friend, without a confidant.

But when I came to this plane, I inadvertently had a large group of friends, and even had my first woman. My life has been turned upside down, it is no longer gray, it has become colorful.

I've found that when I have more friends, the trajectory of my life changes accordingly, and I start to do more things. Because I'm no longer alone. I take care of myself as well as my friends.

When they do something dangerous, I worry. When they are sad, I am sad. When they are in trouble, I want to help them with both sides. When their fate is approaching the abyss of destruction, I will do everything in my power to reverse their miserable fate.

For this, I need liliang! More powerful liliang!

Li Yan

Recorded after the loss of the virgin body (to be continued......)

PS: Thank you for the reward of 688 starting coins, and the reward of Meng and Justice is 100 starting coins