Li Bai’s buying wine is both a poem and a math problem： a 92-year-old teacher published a book that made people fall in love with math.

　　361 cylinders

　　How many ships are you divided into?

　　No more than one ship

　　There is no room for a ship without a cylinder.

　　Wine is the source of Li Bai’s poetic prosperity, and later generations used the mathematical poem "Li Bai Drunk" to describe Li Bai’s heroic spirit of drinking and writing poems. The full text of the poem is: Li Bai walks down the street, carries a pot to buy wine, doubles it when he meets a shop, drinks a bucket when he sees flowers, meets shops and flowers three times, and drinks all the wine in the pot. How many buckets is there in the pot? Can you work out this problem? Teng Yaoyun, a 92-year-old math teacher, used backward calculation, and the answer was 7/8 (7/8).

　　Is math really boring? In order to refute this idea, Teng Yaoyun began to write a book when he was in his 80s. It took more than five years, and more than 400,000 words of "Mathematical Beauty and Mathematical Thinking Method" was finally published before the Teachers’ Day this year.

　　In order to make more people love mathematics, she wrote books in her 80 s.

　　Teng Yaoyun, who graduated from the Mathematics Department of National Women’s Teachers College in 1949, has been teaching mathematics for 36 years, but found that many people are afraid of difficulties in mathematics. Teng Yaoyun’s son, Zhao Yousheng, a professor at the School of Public Administration of Chongqing University, told the chongqing morning post reporter: "My mother told us that many people find mathematics difficult, but it is actually beautiful. The reason why my mother wrote this book is mainly to make the study and teaching of mathematics no longer boring, to help students find beauty in mathematics, to cultivate their interest in learning in the feeling of beauty, to master the thinking method of learning mathematics in interest, and to turn the headache mathematics into a favorite mathematics. "

　　Teng Yaoyun’s "Mathematical Beauty and Mathematical Thinking Method" is just such a book that people no longer feel "horrible" about mathematics. In order to make mathematics more attractive, Teng Yaoyun also asked his wife to join in. Zhao Yousheng said: "My father Zhao Jiayi is an old teacher of Southwest University, and in the book ‘ Mathematics and Poetry ’ In part, there is a palindrome poem by my father, "I have a scene."

　　The golden section can be so interesting.

　　In Teng Yaoyun’s view, mathematics can explain many problems in the real world. For example, the golden section (0.618) is closely related to the magnetic field, human body structure, architectural monuments and even military affairs on the stage. In "Mathematical Beauty and Mathematical Thinking Method", the old man Teng Yaoyun wrote: During the period of War of Resistance against Japanese Aggression, some theatrical troupes were stationed in Jiangjin, and there would be some lectures. I was most interested in the magnetic field on the stage. The announcer had to announce the curtain in the magnetic field, and the wonderful performances had to be performed in the magnetic field to attract the audience to the maximum extent. In the teacher’s explanation, this magnetic field was the golden section of mathematics of 0.618. "

　　For example, in the military, the value of 0.618 is also very useful. "When the rifle was first manufactured, the ratio of the length of the gun body to the handle was very unreasonable, so it was not convenient to aim. In 1918, Alvin, a corporal of the American Expeditionary Force, reformed this rifle, and the ratio of the reformed rifle type to the gun body was just 0.618."

　　The mystery in traditional poetry is originally a mathematical answer.

　　Professor Zhao Yousheng said that a poem circulated among the people can actually be analyzed by mathematics. This poem is: 361 tanks, which can be divided into several ships at your disposal. No more than one ship is allowed, and no one tank is allowed to be missing. After mathematical analysis, the answer to this poem is 19 ships, each with 19 cylinders. "My mother explained it with the square root of." Zhao Yousheng said. Our reporter Luo Xuemei