Mathematics is indispensable in our life. Everything has a mathematical component. The following are the contents of my collected mathematical manuscripts, hoping to help you!
Math Story (1)
198 1 One day in summer, India held a mental arithmetic competition. The performer is a 37-year-old woman from India. Her name is Shagongtana. On that day, she will compete with an advanced electronic computer with amazing mental arithmetic ability.
The staff wrote a long list of 20/kloc-0 bits, asking to find the 23rd root of this number. As a result, it took Shagongtana only 50 seconds to report the correct answer to the audience. In order to get the same answer, the computer must input 20,000 instructions, and then calculate, which takes much more time than Shagongtana.
This anecdote caused a sensation in the world, and Shagongtana was called a "mathematical magician".
Interesting Problems in Mathematics (2)
People call 12345679 "Leak 8". This "number without 8" has many surprising characteristics, such as multiplying by multiples of 9, and the product is actually composed of the same number. People call this "uniform". For example:
12345679*9= 1 1 1 1 1 1 1 1 1 ? 12345679* 18=222222222
12345679*27=333333333 …… 12345679*8 1=999999999
These are all 0 times to 9 times of 65438+9.
And 99, 108, 1 17 to 17 1. Finally, the answer is:
12345679*99= 122222222 1 ? 12345679* 108= 1333333332
12345679* 1 17= 1444444443 … … 12345679* 17 1=2 1 1 1 1 1 1 109
This is also called "uniform".
Mathematical jokes (3)
1, rounding
Zaizai came back from school in high spirits and asked his mother, "Where's Dad?"
Mother saw Zaizai's excitement and asked strangely, "Is Dad at home? What do you want with dad? " "I asked my father for fifty cents,
Interesting math jokes for primary school students. "
"Why?" Mom asked.
"Before taking the math test, my dad told me,' If I get a score of 100, I'll get 1 yuan, and 80 will be given to 8 cents.' Today, I got 45 points in math. "Aberdeen replied.
My mother was surprised and asked, "What! Mathematics is only 45 points? "
Zaizai proudly said, "Yes, it has to be rounded off mathematically, so Dad has to pay 50 cents."
2. Law of multiplication and distribution
The teacher found a student's name in the exercise book: Mu (1+2+3).
The teacher asked, "Whose exercise book is this?"
A student stood up and said, "It's mine!"
Teacher: "What's your name?"
Student: "Mulinsen!"
Teacher: "Then how did you write your name like this?"
Student: "I used multiplication and division!" " "
Mathematical Composition (4)
Mathematics is indispensable in our life. Everything has a mathematical component.
For example, when there is a discount in the mall, we can use math. A dress is 50% off. If the current price is 250 yuan, we can get the original price. Divide 250 by 65438+5/00 to get 500 yuan.
Decorate a house to buy floor tiles, and you can also use mathematics to calculate the most economical choice. If the house is 70 square meters, floor tiles should be laid. Now there are two choices: buy 5 square meters of floor tiles, each 20 yuan; Buy 10 square meter floor tiles, each 50 yuan. We can use mathematics to solve this problem. Find the first price first: 70 divided by 5 equals 14 to calculate a * * *, and then multiply 14 by 20 to calculate the total price in 280 yuan; Find the second price: 70 divided by 10, and so on. That is, seven dollars was spent, and then seven times 50 equals 350 yuan. Obviously, the first one is cheap.
For another example, we have to paint a wall of 57 square meters. How much does it cost to paint a square meter wall in 50 yuan? Multiply 57 by 50 to get 2850 yuan.
Mathematics has many, many uses ... just to be discovered.
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