Mathematics is full of mysteries, waiting for us to explore. The following is a complete diary of mathematical practice, welcome to read!
On Wednesday morning, the sun was shining, the weather was clear and the air was fresh. What a beautiful day! I went to the supermarket for a big purchase!
I skipped all the way, like a happy bird. I was dazzled by all kinds of things in the supermarket, including red apples, green watermelons and yellow bananas.
I have a shopping list prepared in advance, looking for one? I found the towel first, and then the toothpaste. The hardest thing to find is cigarettes. I've been looking for it and finally found it!
Another interesting thing happened while paying the bill. The towel I took, the cashier aunt said that the bar code could not be brushed, so I took another one and wanted to give it up, but I insisted on it until my father was going on a business trip soon. Do you think it's funny?
After buying the bill, start counting when you get home. Towels 15 yuan, two toothpastes 3 1 Yuan. A * * * is 174 yuan 60 points.
This is really a meaningful math practice, which not only exercises my courage, but also enhances my application of math knowledge.
Mathematics is everywhere in life. Learning math well makes life better!
Every time I walk into the campus, there will be a very eye-catching sign with a sentence written on it, that is? Learn mathematics in life and use mathematics in life. ? Yes! We can't live without mathematics. If we don't study math, we will make a lot of jokes. Take an incident that happened to me a few years ago. That day, I got up early, and my mother asked me to help her go downstairs and buy some breakfast. Then I went downstairs with five dollars.
Go downstairs, buy breakfast, pay the money. The boss said: These come to * * * two dollars and fifty cents. I'll give you two dollars and fifty cents. ?
After that, he gave me money. As soon as I saw it, I quickly said: No, no! You gave me one yuan less, so you should give me three yuan and fifty cents! ? The boss listened, stupidly, hesitated for a while, and said to me, little friend, your calculation is wrong, that is, your change is 2.50 yuan! ? As soon as I heard this, I was in a hurry to defend myself: Uncle, you have miscalculated. It's obviously three yuan and fifty cents! ? The proprietress on the side saw it and called me in an angry dialect. Look at this child, he is not young, how come he doesn't even understand the most basic arithmetic! ? Did the people who ate there listen? Ha ha ha? Smiling happily, I looked at it and ran home sadly, telling my parents the whole story. Mom and dad laughed so hard, I said angrily. Even you laugh at me! ? Dad quickly explained:? It's not that we love to laugh at you, but because you don't understand and think about mathematics? Jiao yuanfen? . Then let me ask you how much two fifties are. One yuan. How much are those two dollars?
? Four dollars, of course! ? Finally, I finally understood that my father's explanation was not serious. Since then, I have never made the same mistake again. I will never forget this joke. It taught me a lesson, which will be imprinted on my mind forever. Students, you must study math seriously. Mathematics is not that simple. After learning, you must remember: learn mathematics in your life and use it in your life.
After school in the afternoon, the math teacher gave us an assignment, asking everyone to find a way to measure the volume of disposable chopsticks and record the measurement process in the form of math diary. On the surface, this assignment is a mathematical practice, but in fact it may have a deeper meaning, because the use of disposable chopsticks is related to environmental protection. As soon as I got home, I sat quietly at my desk and thought about it. Disposable chopsticks are irregular three-dimensional figures. How can I calculate its volume? I thought about it, scratching my head for a while, shaking my head for a while, and finally, I got something. I can put disposable chopsticks in a container full of water, so that the water in the container will overflow. Isn't the amount of splashing water as big as chopsticks? But chopsticks are lighter than water and will float on the water. What should we do?
Can you fix chopsticks with stones or plastic sheets? I think it should be possible, but these methods are too troublesome to measure. If only there were a simpler way! After thinking hard, I finally smiled proudly. At noon today, I was doing my math summer homework.
I wrote and wrote, but unfortunately I met a very difficult problem. I've thought about it for a long time, and I can't figure out why. The problem is this: there is a cuboid, the product of the front and the upper two areas is 209 square centimeters, and its length, width and height are prime numbers. Find its volume. After reading it, I thought: this question is really difficult!
Only knowing the product of two surface areas, the volume must also know the length, width and height, but there is no hint at all. How does this start? Just as I was scratching my head, a colleague of my mother came. He taught me to use the idea of equation to solve it first, but I am not very familiar with this method of equation.
So, he taught me another way: list the numbers first, and then exclude them one by one. First, we listed a lot of numbers according to the requirements of the topic, such as: 3, 5, 7, 1 1, and then we began to exclude them, and then we found that only1and 19 were left. At this time, I thought: one of these two numbers is the length of the common side of the front of the cuboid in the question; One is the front of the cuboid, divided by the sum of the lengths of the other side (both lengths are prime numbers). So, I began to tell which number these two numbers were. The final result is 374 cubic centimeters.
My formula is: 209= 1 1? 19 19=2+ 17 1 1? 2? 17=374 (cubic centimeter) Later, I checked this problem with what I learned this semester: prime factor decomposition, and the results were exactly the same. I am happier than anyone to solve this problem. I also understand the truth that mathematics is full of mysteries, waiting for us to explore.
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