Datang romantic little landlord

Li Er swaggered to the front of "The Picture of Luoshen", looked at it carefully again, and nodded to Li Wangyou.

"Why don't you just sell this picture to me, how much does it cost?"

Li Wangyou was also confused by this bearded man, just now he was trying to belittle him, but now he said he wanted to buy a painting, did you deliberately make trouble?

If you feel upset, your tone of voice will naturally not be good.

Li Wangyou cocked his neck: "I'm afraid you won't be able to afford this painting of Luoshen."

"Bastard! How did you talk!"

"Shut up! Ru'an dares to do this, but you don't want to live anymore?"

Before Li Er could speak, a group of ministers with stinky feet jumped out, pointed at Li Wangyou's nose and reprimanded him.

As soon as Li Wangyou looked at the situation, he knew that the man in front of him had an extraordinary identity, so he didn't dare to say anything more, so he immediately kept silent.

Li Er wasn't angry, he laughed and said, "Just ask the price, there is nothing in this world that I can't afford."

Li Wangyou looked up at Li Er silently, only six words were revealed in his eyes.

If you don't blow it, you will die!

061 Sum of geometric sequences

The current situation is very strange, Li Wangyou doesn't like Li Er, and Li Er also doesn't like Li Wangyou, a bastard.

For a while, the two stared at each other for a while in the main hall of Zhang Liang's mansion, and they both felt that looking at each other was not pleasing to the eye.

Although Li Wangyou knew that this bearded man must be a powerful man in the Tang Dynasty, he didn't want to do what he wanted.Obviously refusing is not enough, and opening your mouth to ask a sky-high price will offend people to death, so you have to find a way to deal with this bragging bearded man.

Turning his eyes, he saw the chessboard where the bearded man was playing not far away, and couldn't help but smile.

Li Wangyou bowed and saluted: "Since this gentleman wants to buy the "Luo Shen Tu" from Qiu's family, it's natural. But Qiu's family is a grain merchant, so I don't know if you can accept this picture in exchange for grain?"

Li Er pondered for a while before he heard the words and nodded his agreement. The Chou family is a grain merchant, so it is reasonable to ask for grain rather than copper coins.

Qiu Kun was taken aback when he heard the words, and looked up at Li Wangyou, wanting to say something, but thinking of being beaten for talking too much in front of Zhang Liang's mansion, he immediately shut his mouth tightly again.

"Xiao Lang, how much food do you want?"

Li Wangyou chuckled, and pointed to the chessboard not far away: "I don't want much, just fill that chessboard up."

His words made everyone in the main hall stunned, the food on the chessboard?What does this mean?

Li Wangyou continued to explain: "Please put one grain of rice on the first grid, two grains on the second grid, four grains on the third grid, and eight grains on the fourth grid." , and so on, the number of rice grains in each grid is twice that of the previous one. Just filling all the 64 grids like this, I want so many rice grains. Is it acceptable for you, sir?"

These words made all the officials and Li Er laugh. This young man from the Li family is not greedy. He gave a pair of "Luo Shen Tu" with a little grain of rice. Is this considered as a favor to Li Er?

Cheng Yaojin whispered to Qin Qiong even more secretly: "Did this kid recognize His Majesty? Otherwise, why would you sell this painting at such a low price?"

"It's hard to say, maybe it's not bad for him to think about the drunken scene that day. This little boy is smart and knows how to show His Majesty face. When His Majesty calms down later, it will naturally have his benefits." Qin Qiong guessed the same.

Not only Cheng Yaojin and Qin Qiong had such thoughts, but also many important ministers present who had participated in the Qujiangchi Poetry Meeting also had similar thoughts. .

Even Li Er felt that looking at the boy was a bit pleasing to the eye.

"Haha, since Xiao Lang said so, then I will not be polite. I bought this painting, and I will pay the price you said." Li Er laughed.

He turned to Zhang Liang again and said, "Zhang Qing, I will lend you a stone of food from your house."

Zhang Liang nodded naturally, and there was still a trace of regret in his eyes.It's a pity that he missed such a perfect picture of "Luo Shen Tu".

If Li Wangyou hadn't come to present the picture today, and if Li Er hadn't attended his birthday banquet in Weifu, this picture should have become Zhang Liang's family heirloom.

But now that Li Er has taken a fancy to it, no matter how domineering Zhang Liang is, he will not have the idea of ​​this painting.

Soon, the servants in Zhang Liang's mansion brought up a stone of rice and began to place rice grains on the chessboard according to Li Wangyou's instructions.

All the ministers smiled and said nothing, and some people bet with each other on whether a stone of rice would be enough.Anyway, everyone is not in a hurry, just watch the servants slowly counting the rice grains, which is right for entertainment.

Only Li Wangyou sneered in his heart, hehe, a stone of rice, that was a dream!

This is the problem of "summation of geometric series" that junior high school students will face in later generations.

棋盘上64格里的大米共有“2的64次方减去1”这么多粒，结果是18446744073709551615粒，1800亿兆粒米。

Li Wangyou remembers seeing it on the Internet in later generations, and people who have time to weigh their eggs have weighed it. A kilogram of rice is about 2800 grains.If you really want to install this geometric sequence and calculate it, it will take [-] billion tons to fill the chessboard.

what is this concept?

The annual global rice production in later generations is only about 5 million tons, and 2800 billion tons is basically equivalent to more than the total production of rice grown by humans in history.

With so much rice, Li Er couldn't afford it even if he sold his pants.

Li Wangyou is purely using advanced knowledge to crush the rich and powerful in Datang. This kind of IQ crushing feeling that everyone is drunk and I am alone is really refreshing, and the corners of Li Wangyou's mouth can't help but turn up.

In the main hall, the servants were still counting the grains of rice, and the accountant of Zhang Liang's mansion was helping to count the rice.

Datang had not yet invented the abacus at this time, it was a calculation tool that did not appear until the Northern Song Dynasty.Counting chips are a bunch of small sticks of the same length and thickness, which are arranged vertically and horizontally for counting.

The accountant in Zhang Liang’s mansion was already sweating profusely just after counting No. 20 checkerboard grids. No. 20 checkerboard grids needed to place more than 50 grains of rice.

As time went by, the officials in the main hall and Li Er also found that something was wrong.How does this rice count more and more?

Li Er immediately asked people to start calculating how much rice needed to be placed.

Immediately, a servant took out the steelyard and began to weigh the rice grains.Another minister who was proficient in arithmetic began to send paper pens and counting chips, and worked with Zhang Liang's accountant to calculate how many grains of rice would be needed to fill the chessboard.

The time of one stick of incense passed, and the time of two sticks of incense passed... Those ministers who calculated the numbers with counting chips have become profusely sweating, but the numbers they calculated are getting bigger and bigger.

The person who made the fastest progress only counted to No. 20 six squares on the chessboard, even if he couldn't go on, that was already an astronomical figure.

And the servants in Zhang Liang's mansion also used steelyards to weigh out one tael, which is about 1000 grains of rice. Based on this calculation, a bucket of rice is equivalent to about 19 grains of rice.

"This...it's impossible. According to this calculation, there is not enough rice in the entire Tang Dynasty!" A minister who is good at arithmetic looked at the calculation in front of him and exclaimed.

Li Er and the ministers were startled, and walked quickly to those ministers.

"There's nothing wrong with it. I calculated it just now. I just calculated 26 squares on the chessboard. That number already exceeds the amount of food in the entire Tang Dynasty. This is a chessboard that cannot be filled at all!"

Several ministers in charge of the calculation were sweating profusely, nodding their heads and saying yes, this number is too huge to continue the calculation.

Hearing this, Li Er didn't know that he was fooled.He was furious, and glared fiercely at Li Wangyou who was sitting at the banquet drinking and eating meat all day long.

"Xiao Lang, explain to me, what exactly does this mean? Are you playing tricks on me?" Li Er said angrily.

The officials who thought that Li Wangyou was deliberately trying to impress Li Er were all dumbfounded.