Liu Tong walked out of the memories with difficulty. This is a magical experience, what happened nearly 2,000 years later, for Liu Tong, was more than ten days ago. How is Liu Zhen? Dad and Mom love themselves so much, in the face of the only son who disappeared out of thin air, can the two of them withstand the blow of the collapse of the sky? Every time Liu Tong thinks of this, he is inexplicably sad, parents, don't be sad, your son is still alive!

Liu Tong lay quietly, after a long time, he was extremely bored, so he went out and went over to chat with Cao Xian and others, but saw that in the outhouse, Cao Xian and the red carp were being tortured by the little girl about arithmetic. Cao Xian was very happy when he saw Liu Tong coming, so he instigated the little girl to embarrass Liu Tong.

Liu Tong touched the little girl's head and asked, "What's your name?" ”

The little girl looked like a porcelain doll with a pair of big eyes that were unusually smart, "If you want to know my name, it's not difficult, just answer me a question and I'll tell you." ”

Liu Tong was interested, and stretched out his hand to make a gesture of please.

The little girl was very happy to see that someone was so willing to be judged by herself, and pouted, "My mother gave me a five-baht coin on the first day, two on the second day, and three on the third day. ”

Liu Tong was happy when he heard it, isn't this an entry-level Olympiad? When I was in the third to fifth grade of primary school, I had been studying the Olympiad for three years, and I opened my mouth and replied, "Four hundred and sixty-five." ”

The little girl was stunned when she heard this, and she never thought that Liu Tong opened her mouth to say the answer to such a difficult question. Cao Xian also cast an admiring gaze, and the red carp was very happy and proud.

The little girl came back to her senses, and unconvinced pointed to the pond next to the gazebo where several people were sitting and asked: "The pond is eight acres in total, and there is duckweed, which doubles every day, and grows full on the twentieth day. ”

Liu Tong thought to himself, you are not simple, you have come into contact with such a difficult problem. He pretended to think about it and replied, "One acre of duckweed." ”

The girl was immediately stunned. "Impossible, impossible, I calculated these two questions for a day to figure it out, how can the big brother open his mouth and come. I'll ask you again......"

Liu Tong laughed, "What, you want to play tricks?" ”

The little girl's eyes flashed and she looked at Liu Tong strangely, and Liu Tong said, "Didn't you say okay, answer a question, and tell me your name?" ”

"Oh, yes, yes, my name is Cao Jie!"

Liu Tong was taken aback, Cao Jie, isn't she Cao Cao's daughter and the empress of Emperor Xian of the Han Dynasty in history, who has been maintaining and accompanying Liu Xie to old age, the famous Duchess of Shanyang. Sure enough, it's an anomaly of intelligence.

Liu Tong touched Cao Jie's head and said: "Xiao Cao Jie, the way of arithmetic has its own rules, your problem must not be difficult for me, you only know the way of addition and subtraction, I know more, such as multiplication and division, etc." ”

Cao Jie was unconvinced and said: "You must be a liar, someone must have taught you the same problem before." ”

Liu Tong saw that Cao Jie was smart, and he was also interested, so he said: "Okay, just when I calculated before, then I will test you, if you answer, I will teach you the way of multiplication and division." ”

On the side, Cao Xian was also interested, "Okay, if I answer, you have to teach me too!" ”

"Okay. In this way, there are two questions, and as long as you answer one correctly, you will be taught. ”

Liu Tong thought for a while, recalled a little, and asked: "I don't know how many guests come to the house, four more corn cakes per person, four more, five corn cakes per person, five less, how many guests are there at home, how many corn cakes are there?" ”

Liu Tong smiled and asked: "Today, there are chickens and rabbits in the same cage, with thirty-five heads on the top and ninety-four feet on the bottom. ”

After Liu Tong finished asking, all three of them lowered their heads and pondered. Liu Tong saw that the three of them were extremely serious, so he got up and left.

Liu Tong was bored, went into the house to meditate up, although Liu Tong looked a few days ago, the external injury healed, but he didn't dare to practice, the last time he fought with Cao Anmin to use his true qi, there was a faint pain in his abdomen at that time, knowing that the wound was not completely complete. Since I found that my physical condition has greatly improved after practicing, I have been practicing every day, and I am very unaccustomed to not practicing these days.

Half an hour later, Cao Xian pushed the door in, rushed over excitedly, pulled Liu Tong up and said loudly: "I calculated it, I calculated it!" Nine visitors and forty loaves, right? ”

Liu Tong had already put away his true qi when Cao Xian entered the door, and let Cao Xian pull him up. Liu Tong was very curious, how did Cao Xian calculate it, and said: "Miss is really smart, how can you calculate it?" ”

Cao Xian said proudly: "I assume that the number of visitors will be verified one by one, five is wrong, it is six, six is wrong, it is seven, until nine is just right!" ”

Liu Tong's face was black, "It's indeed a way!" ”

"Childe, how did you calculate the two questions of the second sister?" Cao Xian asked curiously.

Liu Tong was helpless, since he had words first, he had to teach Cao Xian.

"The question of monthly money, the first and thirty-two days of the first month are thirty-one dollars, the second and twenty-ninth days of the first month are also thirty-one dollars, and so on, the fifteenth and sixteenth days are also a total of thirty-one dollars, a fifteen group, using multiplication, is fifteen times thirty-one, so a total of four hundred and sixty-five money.

As for the duckweed, it should be reversed, the twentieth day is full, the nineteenth day is half full, the eighteenth day is a quarter, the seventeenth day is one-eighth, a total of eight acres, isn't it one acre? ”

"Childe is really talented! What is multiplication? Cao Xian didn't understand the score, but it didn't prevent her from marveling, Liu Tong was grabbed by Cao Xian's hand, and he pulled it out if he wasn't used to it, Cao Xian found himself holding Liu Tong's hand at this time, and he couldn't help blushing.

"As for multiplication and division, it's the way of counting, it's a long story, I'll teach you when I have time." Liu Tong thought to himself, didn't the teacher say that in the Spring and Autumn Period and the Warring States Period, there was a ninety-nine multiplication song? Why don't they know, is the teacher wrong? Or do ordinary people in this era not learn this at all?

Cao Xian's heart was itchy, "Childe, how can chickens and rabbits be counted in the same cage?" ”

"This question also needs to be ingenious. Now I command all the chickens and rabbits to lift up two feet, thirty-five heads, is it seventy feet? There are still twenty-four rabbit feet left, and the rest of the feet are all rabbits, and every time the rabbit has two feet left, aren't there twelve rabbits? Thirty-five heads, minus twelve rabbits, isn't that twenty-three chickens? ”

Cao Xian chuckled after hearing this, "The algorithm is good, how can chickens and rabbits listen to you like this?" ”

"Big brother, you are partial, how can you teach your sister in private, I want you to teach you too!" At this time, Cao Jie and the red carp held hands and entered the door.

"Shame or not, if you can't figure it out yourself, you can't do it, I have calculated a problem, Luo Gongzi, you can only teach me alone."

Cao Jie was very depressed after hearing this, snorted and turned his head and left, and the red carp hurriedly chased out to comfort him. Cao Xian glanced at Liu Tong, lowered his head and laughed shyly.

Liu Tong was entangled by Cao Xian, so he had to teach her multiplication, and after teaching for a while, he wrote the ninety-nine multiplication table to her and asked her to memorize it. Cao Xiancai reluctantly left, and the red carp was not interested in arithmetic, but after asking a few questions, he continued to help Liu Tong sew clothes.

Liu Tong was bored, and because of a night of insomnia, he soon fell asleep in bed. When the afternoon sun lazily passed through the window, reflected on his face, and woke himself up through his eyelids, Liu Tong heard a shout and heard the red carp whisper: "Childe is still resting." ”

"If you don't get up again, it'll be dark!"

Liu Tong heard the milky voice of Cao Jie, and after getting up, he wiped his face with a towel dipped in water, and saw that the red carp was sitting next to the outhouse and staring at the things on the plate, looking curiously.

"Sister, you can taste it first."

"Let's wait for Childe to wake up and taste it."

Apparently Cao Jie sent something to eat, and the red carp insisted on waiting for him to wake up before eating together.

"What's delicious?" Liu Tong walked over.

"Brother Luo, I'll give you Kunlun artifacts to eat, can you teach me arithmetic?" Cao Jie, seeing Liu Tong coming out, jumped up, grabbed Liu Tong's hand, and asked with a little face.

What kind of fetish? Liu Tong pulled Cao Jie to the side of the desk, only to see two lumps of yellow soft stuff on a plate on the desk, with darker skin crumbling on it. Liu Tongtong tugged at his hand, "This is a sweet potato, why is it so badly cooked?" ”

Cao Jie looked at Liu Tong in surprise, and saw Liu Tong wiping the sweet potato paste on his fingers on the plate, shaking his head disdainfully, so he asked, "Brother Luo, this is a Kunlun artifact!" In the whole of Shinno, there is no one except my family. Cao Jie saw that Liu Tong recognized the sweet potato at a glance, and was a little disappointed, and immediately weakened his mind to show off

Yes, this is the Han Dynasty, and the sweet potatoes were brought from the Americas in later generations, how could the Cao Cao family have it? Liu Tong wondered in his heart, staring at the sweet potato, what was the chance that Cao Cao obtained this thing, listening to Cao Jie's meaning, this thing should not be promoted, and it is not easy for Cao Cao's family to dare to eat it.

"Childe, you can taste it." Red carp is very rare.

"Miss Cao, although this sweet potato is delicious, it is not boiled directly in water, and if you cook it like this, it will make it messy, not only not good-looking, not easy to take, and not delicious."

"Oh, what should I do?"

"Eating raw, steaming, and roasting is better than boiling. I haven't eaten sweet potatoes for a long time, if there are any raw ones at home, bring a few, and I'll teach you to roast and eat them! ”

When Cao Jie heard this, it turned out that he had eaten illegally before, so he ran out of the smoke.