1. Contents and texts of the fourth-grade mathematics handwritten newspaper.
The problem of trains running in opposite directions Two trains are running in opposite directions along the same track, and each train runs at a speed of 50 miles per hour. When the distance between two carriages is 100 mile, a fly flies from train A to train B at the speed of 60 miles per hour. When it meets the train B, it immediately turns around and flies to the train A, and so on until the two trains collide and crush the fly into pieces. How far did the fly fly before it was crushed to death?
We know that the distance between two cars is 100 miles, and the speed of each car is 50 miles per hour. This means that each car has traveled 50 miles, that is, two cars collided one hour later. During the short time from the train to the collision, the fly kept flying at 60 miles per hour, so when the two cars collided, the fly flew 60 miles. Whether the fly flies in a straight line, in a "Z" shape or tumbling in the air, the result is the same.
2. The fourth grade primary school mathematics handwritten newspaper content text
Euler, Swiss mathematician, member of the Royal Society. Euler was fascinated by mathematics since he was a child, and he was an out-and-out mathematical genius. /kloc-became a student in university of basel at the age of 0/3,/kloc-obtained a master's degree at the age of 0/6, and was promoted to a professor at the age of 23. 1727 was invited to work in the Academy of Sciences in St. Petersburg, Russia. Overwork blinded him. However, this did not affect his work. Euler has an amazing memory. Hydrogen theory 177 1 a fire in St. Petersburg reduced his large collection of books and manuscripts to ashes. With his amazing memory, he dictated and published more than 400 papers and many works. Euler, a mathematical superstar in18th century, has made great contributions in the fields of calculus, differential equations, geometry, number theory, variational science and so on, thus establishing the position of the founder of variational method and the pioneer of complex variable function. At the same time, he is also an excellent popular science writer, and his popular science books have been reprinted for 90 years. Euler is the most prolific mathematician ever. It is said that his precious cultural heritage was enough for all the printing presses in St. Petersburg to be busy for several years at the same time. As one of the four mathematicians who contributed to mathematics (the other three are Archimedes, Newton and Gauss), Euler is known as "Shakespeare in mathematics".
3. The fourth grade primary school mathematics handwritten newspaper content text
How many socks can you make a pair? The answer to the question how many pairs of socks can be paired is not two. And not just in my house. Why is this happening? That's because I can guarantee that if I take out two socks, black and blue, from the drawer on a dark winter morning, they may never be a pair. Although I am not very lucky, if I take out three socks from the drawer, I will definitely have a pair of socks of the same color. Whether the socks are black or blue, there will be a pair of the same color in the end. In this way, with the help of one more sock, the mathematical rules can overcome Murphy's law. From the above situation, it can be concluded that the answer to "how many socks can make a pair" is three.
Of course, this is only true if the socks are two colors. If there are blue, black and white socks in the drawer, take out a pair of socks with the same color, at least four pairs. If there are 10 pairs of socks with different colors in the drawer, you must take out 1 1 pairs of socks. According to the above situation, the mathematical rule is: If you have n kinds of socks, you must take out N+ 1 to ensure that you have an identical one in Shuang Yi.
4. The fourth grade primary school mathematics handwritten newspaper content text
There is a treasure on an island. You see three islanders, big, medium and small. You know the big islander knows whether the treasure is on the mountain or under the mountain, but sometimes he tells the truth and sometimes he lies. Only the Chinese islanders know whether the big islanders are telling the truth or not, but the Chinese islanders themselves tell the truth when the previous person tells the truth and tell lies when the previous person tells lies. Two islanders raised their left or right hands to show whether they want it or not, but you don't know which hand said yes and which hand said no, only the island. But he always tells the truth or lies, and you don't know which of these two types he is. Can you ask whether the treasure is on the mountain or under the mountain with the least number of questions? Tip: If you ask an islander where the treasure is, he will ask how you know where it is. Equal to asking in vain)
answer
For convenience, we call the large, medium and small islanders ABC (in fact, we don't use C). The first question is A: Is the treasure on the mountain? The second question is B: Is A correct? The third question is B: 1+ 1 = 2, right? Ok, now the first question is, we don't know whether A answered "yes" or "no" or whether A answered "yes" or "no". We only know whether A raises his hand with his left hand or his right hand, so we leave him alone. Look at the second question. No matter whether A's answer is "yes" or "no", as long as A's answer is correct and B is correct in the second question, then he should answer "yes" (if he can speak Chinese). Still the same. Whether A's answer means "yes" or "no", as long as A's answer is wrong and B's answer is wrong on the second question, he should still answer "yes". So anyway, B's raised hand means "yes"; The third question: since we know what the right hand means, we can determine whether A is true or false as long as we know whether B's answer just now is true or false, because the truth of both must be the same. So just ask a question, like 1+ 1=2, right? There is another way: First, ask a random person: Are you telling the truth? That person will definitely raise his hand for yes, because if he is telling the truth, he will raise his hand for yes, and if he is lying, he will also raise his hand for yes, so it can be concluded that the hand represents yes and then ask the China islanders: Did the big islanders say that the treasure is on the mountain? China islanders must have answered correctly, which means the treasure is where China islanders said.
Because if the China islanders say, if the big islanders are telling the truth, then the China islanders are telling the truth, then the treasure must be on the mountain. If the big islanders are telling lies, then the China islanders are telling lies. In fact, the big islanders mean that the treasure is under the mountain, but because it is fake, the treasure is still on the mountain.
5. The fourth grade primary school mathematics handwritten newspaper content text
In our concept, "1" is the smallest number, the first number of an integer, and the first number of ten thousand. Yes, "1" is the first number of ten thousand, and its position is also the most special. Let's meet this magic number with me. First, the smallest number.
The ancient and huge family of natural numbers consists of all natural numbers 1, 2, 3, 4, 5, 6, 7, 8, 9, 10. The smallest one is "1", which cannot be found. You can look for it if you are interested.
Second, there are no natural numbers.
Maybe you think you can find a natural number (n), but you will immediately find another natural number (n+ 1), which is greater than n, which means that you will never find a natural number in the family of natural numbers.
Third, "1" is indeed the smallest in the family of natural numbers.
The natural number is infinite, and "1" is the smallest of the natural numbers. Some people disagree that "1" is the smallest natural number, saying that "0" is smaller than "1" and "0" should be the smallest natural number. This is wrong, because natural numbers refer to positive integers, and "0" is a non-positive and non-negative integer, so "0" does not belong to the family of natural numbers. "1" is indeed the smallest in the family of natural numbers.
Don't underestimate the smallest "1", which is the unit of natural numbers and the first generation of natural numbers. Humans first recognized "1", and only by using "1" can we get 1, 2,3,4. ...
I told you the special status of "1", which is the first in a thousand miles. Don't underestimate it.