Mathematics is an infinite science. In daily life, we can't do without mathematics, which is inseparable from life. Next, I sorted out the contents of the math handwritten newspaper in my life for you. Welcome to reading.
Mathematician's story: calculus on wrapping paper
Mathematician Hua dropped out of school when he was a teenager and helped his father run a small shop. In his spare time, Hua often uses wrapping paper to solve math problems.
One day, Hua was calculating on the counter, and his father asked him to clean the back room. After cleaning, he returned to the counter and couldn't help crying: "Where is the draft paper I calculated?"
Dad looked around but couldn't find it. Suddenly, he pointed to the back of a man in the distance and said, "I sold him cotton."
Hua caught up with the man and bowed to him. Then he took out his pen and copied the calculation questions written on cotton paper on the back of his hand.
Passers-by looked at Hua puzzled, shook his head and said, "What a strange child!" " "
Principle of complementary entry and exit
That is, 2ab+(b-a) 2 = c 2, which is simplified as a 2+b 2 = c 2. Its basic idea is that the area of a figure remains unchanged after cutting and repairing. When Liu Hui annotated "Nine Chapters Arithmetic", it was more clearly summarized as the principle of complementarity between entry and exit, which was the basis of later acting. In his notes, Zhao Shuang proved the Pythagorean Trilateral Theorem and 24 propositions of its sum-difference relationship. For example, √(2(c-a)(c-b))+(c-b) = a, √(2(c-a)(c-b))+(c-a) = b, √(2(c-a)(c-b))+ (. In addition, this method is applied to multiplication and division by using "homology", and the double difference technique is proved in Laogao Graph Theory. Zhao Shuang's mathematical thoughts and methods have a certain influence on the formation and development of China's ancient mathematical system.
Zhao Shuang claimed that he had to take a negative salary in his spare time, and studied Zhou Xie, so he made notes for it. It can be seen that he is a mathematician who has not been divorced from manual labor. It is generally believed that The Book of Zhou Bi suan Jing was written around 100 BC, and it is an astronomical work that uses mathematical methods such as fractional operation and Pythagorean theorem to explain the theory of Gaitian. Nine Chapters Arithmetic, written almost at the same time, clearly put forward Pythagorean theorem and some problems to solve Pythagorean form. Zhao Shuang's Jing Zhu of Zhou Chuanshu explains the scripture of Zhou Chuanshu paragraph by paragraph.
Wonderful "5"
I remember that I knew Arabic numerals, and when I first came into contact with 5, I had a strange feeling about 5. In the past few years, I feel more and more that 5 is a complete and wonderful number.
Friend! Do you know: "5 is a hand" and "5 is half the world", because ten is a symbol of perfection. If ten represents the universe, five should represent half the world. One hand has exactly five fingers, and two hands have ten fingers. Isn't five half the world?
In the observation, it is found that 5 is widely used in daily life, which can be said to be everywhere. As far as our human body is concerned, everyone has five fingers, five toes, five facial features and five internal organs in each hand. One less five and one more five are the greatest pains in life. Moreover, when the head and limbs stand apart, it shows the beauty of the human body. What's even more amazing is that when drinking and guessing boxing, people love to applaud the five champions, and the probability of winning is very high.
In daily life, people also have many beautiful descriptions of the May 4th Movement, such as "colorful, colorful and full of five flavors". What is even more surprising is that many great revolutionary movements and festivals are inseparable from this wonderful May 4th Movement, such as the famous May 4th Movement, May 1st International Labor Day and May 4th Youth Day.
These are just a drop in the ocean for the complete, wonderful and magical five people. In the profound and sacred field of mathematics, five is even more powerful and plays its unique role.
Among natural numbers, 5 is a prime number, which is the combination of the first negative number and the first positive number. So some people often use 5 to represent marriage, but 5 itself has many wonderful properties. There are also wonderful characteristics in the square operation of two-digit numbers with mantissa of 5, such as 152 = 225, 252 = 625,352 =1335.
It is observed that the last two digits are 5 and 2 in turn, and the top digit is the product of the first digit of the two digits and the sum of 1, so that the result can be known, which often excites the fast calculator.
When 5 is multiplied by any odd number, its last number is 5, and 5 is both self-complementary and self-complementary. 52=25, 5+5= 10 is called self-complementary, and the last digit of 52 produces 5 again, which is called self-complementary. There are many such numbers: for example, 5, 25, 625, 90625 are all self-generated numbers, while 5, 75, 375, 9375 are self-complementary numbers.
In complex and mysterious geometry, such as regular pentagons and pentagons are closely related to 5 and inseparable. In particular, the five-pointed star has stability, and its five angles are evenly distributed in five directions, two at the bottom, two at the left and right, and one at the top, giving people an absolute sense of harmony and beauty. Our national flag uses a five-pointed star as a pattern to form a beautiful figure. This is because there are many golden points in the five-pointed star, which shows the unity of change and the harmony of its internal point system.
A regular Pentagon also has many wonderful properties, all sides are equal, and the central angle of each side is 1/5× 360 degrees, and there is no remainder. Every two vertices of a pentagon form a pentagram. Therefore, it also contains many wonderful and incomparable beauty.
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