A 300 word math journal is urgently needed

It's the weekend again, alas, the homework is done, it's a long day, how should I live? I was bored, so I grabbed a copy of "100,000 Whys" and picked it up to read. "Alas, it's a book I've read again. "I complained.

Click"The door opened, oh, it turned out to be Dad, just right, I want to be angry! "Dad, I'm so bored! ""Just read a book!

When you were a child, how did your dad and I have a computer or TV? ""But you won't let me go out to play ......""By the way, I recently saw a math problem, I'm afraid ......Our eldest lady of the Liao family can't be counted. "Obviously, Dad was hanging on my appetite.

However, I have always been competitive and strong, but I still can't stand this test, said"Let's get the question! "

Let me start with a story about the ancient Indian king, who was very fun-loving. At one time it was ordered that a job list be posted throughout the country: if anyone could find a wonderful game for the king, a great reward would be given. "

I waited impatiently and said:"Hurry up and get the question out! "Dad said:

Don't worry! Let's get to the point! A warlock unveiled the job list.

He invented a chess game that made the king reluctant to let go. The king asked the warlock happily:"What reward do you want?

The warlock hastened"King, I only ask you to put 1 grain of rice in the 1st square, 2 grains of rice in the 2nd square, 4 grains of rice in the 3rd square, and then put 1 times more rice than the first 1 square in each of the back squares, and 64 squares are full, which is the reward I requested. "The king agreed.

The question is, can the king give these rice prizes to the warlocks?

Isn't it easy? I secretly brought a computer, but my dad said:"You can't use a computer. "I was a little panicked because my dad wasn't joking.

Let's do the math, there is 1 grain of rice in the 1st grid, 2 grains in the 2nd grid, and 4 grains in the 3rd block......From the 1st to the 64th, 2 had to be multiplied 64 times, subtracted by 1, and after an hour of my calculations, the result was: 18446744073709551615.

Why is this number so staggering? It turns out that because this warlock cleverly uses 2 as the basic multiplier, and the number of squares on the board is 64 as the multiplier of this multiplier, then this 2 must be multiplied 64 times continuously, and as for why 1 is subtracted, it is because the first square is only 1 grain of rice. The number of 1 grain of rice and 2 grains of rice is indeed very small, but if this 2 is multiplied continuously, it will become a huge number.

How could a king who lacks knowledge know?

Our society, our lives are full of math problems, and people who are not high in math are indeed easy to suffer. I'm going to have to hurry up and study the math Olympiad.

Math Small**.

Math on the basketball court.

One Sunday morning, I went to play basketball with my friends.

After a while, the two of us got tired and went to the audience to rest. Suddenly, I thought of a question, and I couldn't help but say it: "Xiao Ming throws 8 balls a minute, Xiao Hong throws 6 balls a minute, after they shoot together for 8 minutes, Xiao Hong improves the shooting rate and throws 8 balls a minute, Xiao Ming only counts 6 balls a minute due to physical exhaustion, and asks how many minutes later Xiao Hong and Xiao Ming throw the same number of balls?"

Probably because my friend was too tired, he couldn't answer such a simple question, he thought about it for a while and didn't make it, and after a long time he still didn't come up with it. Time passed minute by minute, and he really couldn't think of it, so he had to say embarrassedly: "I can't do it without a sketchbook."

I know that even if he has a draft, he may not be able to make it.

I proudly said: "It turned out that Xiao Ming scored 2 more points than Xiao Hong, and he shot for a total of 8 minutes, that is, 8 2 = 16 (pieces), and then Xiao Hong in turn shot 4 more points than Xiao Ming per minute, so how many minutes more do you have to shoot 16 balls?" 16 4 = 4 (points), it takes 4 minutes to catch up.

He said, "You're amazing! "I'm a genius!

I joked. We both laughed.

Through this incident, I realized that mathematics is everywhere in life, in my studies, and in my work. Since then, I have enjoyed mathematics even more.

Mathematics is everywhere, there is a lot of mathematics around us, mathematics is indispensable, otherwise it will bring all kinds of things to life. Inconvenience, let's look for mathematics and explore mathematics together.

Circle", we can see it everywhere, isn't the bottom surface of the moon cake box, tea canister, and medicine box all round? However, they are called cylinders as a whole. Picking up these cylinders, you may think, why make the bottom surface round?

Why not make rectangles, squares? I used to doubt it, but now I can help you solve it!

If you make a box, a cube, and a cylinder with the same material, and then you calculate the volume, and we will find that the cylinder is the largest, the cube is the second, and the cuboid is the smallest. At this time, I understood, in order to save materials, I made these boxes round, so that the volume was also expanded.

That's the benefit of cylinders.

Today, my dad and I went to the bookstore to buy books.

We came to the bookstore. I picked out a book I had been looking forward to for a long time and went to the cash register. Dad said:

You are the yuan of this book, I am the yuan of this book, I take 3 more ballpoint pens, give 50 yuan and how many yuan is left? If you guess correctly, the rest of the money will buy you ice cream to eat. "I think:

The sum of 50 minus plus multiplying 3 is equal to yuan. I said, "Yuan."

Okay, I'll buy you ice cream for this yuan. Dad said cheerfully.

When I came to the ice cream shop, my father asked me again, "I bought 2 yuan of ice cream, I paid it, how much money is left?" "I think:

Simple, minus and multiply by 2, is equal to the yuan. I said, "There's still a dollar left."

Dad said, "Not bad! It's OK.

I said angrily, "You underestimate me, this is a two-year-old topic." If I don't know any of this, am I still a fifth-grader?

Mathematics is inseparable from life.

The math diary essay of about 300 words is as follows:

The first unit we learned this semester was cuboids and cubes, math diary composition. I learned this about the box: it has 12 edges, 6 faces, and 8 vertices;

The lengths of the three edges that intersect a vertex are the length, width, and height of the box, respectively. The length of each opposite edge is the same length, and the area of each opposite side is equal, if the area of one opposite side is square, the area of the remaining four faces is the same.

The formula for the surface area of a box is: length x width x2 length x height x2 width x height x2, and one is (length x width length x height width x height) x2. Its volume formula is: length x width x height.

The knowledge about the cube is that it has 12 edges of exactly the same length, 6 faces with a perfect area, and 8 vertices.

The formula for the surface area of the box is: edge length x edge length x6, and the volume formula is edge length x edge length x edge length. The formula for the unification of cubes and cuboids is: base area x height and cross-section area x length.

The thing about the volume is: the length of the volume is measured from the inside. 1 liter 1 cubic decimeter, 1 milliliter 1 cubic centimeter. The formula for calculating the volume is the same as for calculating the volume of a box.

If the problem asks you to find the volume unit, but the first step of the problem is to ask you to find the volume unit, you have to convert it from the volume unit to the volume unit. The near-green between volume units and volume units is 1000.