Du Shenfei said: "Then have you ever studied arithmetic?"

Chang Qing said: "When I was a child, I also read with my husband for a few years, and I also know a little arithmetic, and I have also read three of the ten books of arithmetic, "Nine Chapters of Arithmetic", "Five Cao Suanjing" and "Zhou Ji Suanjing". Pen, fun, pavilion www. biquge。 infoI also learned addition, subtraction, multiplication and division, equations and Pythagorean. If you don't believe me, I can give you an arithmetic problem to do, and also test whether you have also studied arithmetic. ”

Du Shenfei said with a smile: "Arithmetic! Fang Tian, corn, difference, business merit, both losing, and winning are insufficient, I also know a little." Since you want to test me, then you can do it!"

Chang Qing said: "Then you listen well! Thirty-three Trojan horse benches, one hundred feet turned up, ask how many Trojan horses, how many benches?"

Du Shenfei laughed, touched his chin with one hand, shook his head, and said: "Four times thirty-three is one hundred and thirty-two, one hundred and thirty-two minus one hundred is thirty-two, thirty-two times three is ninety-six, and one hundred minus ninety-six is four." The bench has four legs, and the Trojan horse has three legs. There are thirty-two wooden horses, one bench. ”

Chang Qing also laughed and said, "You are so smart!"

Du Shenfei said: "You are too pediatric, I will do it when I am six years old, and it is much easier to use direct division, do you still have any difficult arithmetic problems?"

Chang Qing said: "Then I'll make it more difficult for you!"

Du Shenfei's eyes lit up, and he said, "Okay! Get out! I'm listening!"

Chang Qing said: "One hundred steamed buns and one hundred monks, the three big monks are even more indisputable, the three small monks are divided into one, and the big and small monks are how many dings each?"

Bai Zhu listened to this question, and also asked Du Shenfei, "Brother, what does this arithmetic problem mean?"

Du Shenfei said with a smile: "This arithmetic problem is to say that there are one hundred monks, divided into one hundred steamed buns, one big monk is divided into three, and three small monks are divided into one, just after the division." Ask the big monk and the little monk, how many people are there? Bai Zhu, you can also count. ”

Bai Zhu said: "Monk, is it Big Brother Po?"

Du Shenfei smiled: "Yes! It's almost the same as him." But he is not the only monk in this world. ”

Bai Zhu said: "Why can the big monk share so much, and the small monk so little? It's so unfair!"

Du Shenfei said: "Baizhu, this is not true, just hypothetical." We can also assume that there are three great monks and three small monks. ”

Bai Zhu thought about it, rolled his eyes, and suddenly covered his eyes with his hands, and said with a smile: "I don't know! Brother, you will also teach me arithmetic in the future. ”

Du Shenfei said: "Okay! I'll teach you when I go home!" and said to Chang Qing: "On this topic, there are twenty-five big monks and seventy-five small monks." ”

Chang Qing laughed and said, "That's right! You're right. Then I'll come up with another question, this one is much more difficult. This question is Han Xin's point soldier. It is said that Han Xin led more than a thousand soldiers to fight and killed hundreds of people. Han Xin wanted to quickly count how many people were left, so he ordered the soldiers who were still alive to stand in a row of three with two more, five in a row with four more, and seven in a row with six more. How many soldiers are still alive?"

Du Shenfei sat on the horse, didn't think about it, and said: "Well, I have also read the book "Sun Tzu's Sutra" There is a problem of 'things do not know the number', so he said: 'There are things that do not know the number, the remaining two of the three or three numbers, the remaining three of the five or five numbers, and the remaining two of the seven or seven numbers. 'The answer to your question is one thousand and forty-nine. ”

Chang Qing sighed and said, "You are indeed a smart person. I also have a problem that is related to numbers, but you may not be able to solve it. ”

Du Shenfei immediately laughed and said: "Haha! If you have any problems that I can't solve, just say it!"

Chang Qing said: "Let me ask you, from one to nine, which number is the most industrious and which number is the laziest?"

This time, Du Shenfei grabbed his head, thought about it for a long time, and didn't come up with it, so he had to ask Chang Qingdao: "This topic is indeed too difficult! Tell me, which number is hardworking and which number is lazy?"

When Chang Qing heard this, he laughed and said, "Haha! I'll tell you, if you can promise me one condition, I'll tell you. Otherwise, it's a no-brainer. ”

Du Shenfei asked, "Oh, what are the conditions?"

Chang Qing smiled: "My conditions, in fact, are very simple for you. That is, after catching up with Tang Huai, you must not come to hurt me. Can you say yes?"

Du Shenfei didn't even think about it, and said: "Okay! Since we chatted so happily all the way, as long as you don't think of ghost ideas to harm me, I promise not to harm you!"

As soon as Chang Qing heard this, she immediately laughed like a flower and said, "Okay! I believe in you! My answer to this question is, one is the laziest, and the other is the most diligent. ”

Du Shenfei pondered for a long time, but he still didn't understand, so he had to ask again: "Why is one the laziest and the second the most diligent?"

Chang Qing said: "Because 'one does not do two endlessly'." ”

Du Shenfei listened, laughed loudly, and said continuously: "Interesting! Interesting! Sure enough! It seems that you are also a very interesting person, if you don't follow Tang Huaihao to do this kind of dehumanizing thing, I may really consider thinking about marrying you as a wife." ”

Chang Qing immediately said: "Actually, I can change it, as long as you are willing, I will definitely change it quickly." ”

Du Shenfei also sighed lightly and said: "You can be unkind and unkind, but you must not always harbor malice, and don't hurt the happiness of others!"

Chang Qing seemed to nod her head slightly.

Du Shenfei said again: "Then I'll also give you a very simple arithmetic problem, okay?"

Chang Qing also smiled and said: "Okay! Since you have this Yaxing, it's boring to be in a hurry anyway, so I have to accompany you, so you can solve the problem!"

Du Shenfei said: "Okay! Listen well! Horses can travel 300 miles a day, and horse-drawn carriages can travel 150 miles a day. The horse and the carriage follow the same route from the same place, and the carriage travels first for two days, how many days does it take for the horse to catch up with the carriage?"

Chang Qing said slowly: "The horse can catch up with the carriage in two days." ”

Du Shenfei said: "Since the horse can catch up with the carriage in two days, why has our horse been walking for two days, but we haven't seen Tang Huai's carriage yet?"

Chang Qing said: "Presumably, Tang Huaihao is not far from here." Perhaps, they'll be staying at a nearby inn right now, and we'll be able to catch them tomorrow. ”

Du Shenfei said: "Okay! It's getting late today, let's go find a place to rest for the night, and we'll leave tomorrow!"

Several people were talking and hurrying away. Before I knew it, I had come to Dushan Town.

I saw that the streets of this town were very clean and tidy, and the streets were lined with red lanterns. At this time, although it was night, the stores had not yet closed, but there were many people, men, women and children, walking around, shopping at fruit shops, dim sum shops, and looking at silk shoe shops and pillow crown shops. The voice is loud and lively.