Hurry! A beautiful math diary!!!! 15

Moore Manor (Math Diary).

Saturday, July 10th.

"Moore Manor" is a very popular game among our elementary school students, and I found that "Moore Manor" also contains a lot of math knowledge, which can also improve our math level in addition to the game.

I don't have furniture in my home in the game, in the "magazine" of the game, I found a beautiful set of small furniture worth 5100 mole beans, however, I only have a deposit of 4300 mole beans, what should I do to buy this set of furniture?

So I used my brain and found that there is interest on moore beans deposited in the bank, the interest rate is 3% per day, and my 4300 mole beans are deposited in the bank, and the interest per day is: 4300 * 3% = 129 mole beans.

A day later, my deposit became: 4300 + 129 4429 moles of beans;

Two days later, my deposit became: 4300+129 2 8858 mole beans;

In two days, my deposit will be able to pay for the furniture!

How much more? 8858-5100=3758 moles of beans, and I can buy another dress to dress up my moles. "I think.

I think there is mathematics everywhere in life, including games, as long as we use our brains, many small problems in life can be solved with mathematics!

Math diary. August 12 Sunny.

Our country has a population of about 1.3 billion, and if we save 1 dime per person per day, then we will save about 13 million yuan in the whole country. Wouldn't it be great if elementary school students saved about 10,000 yuan from the first grade of primary school to university, and then this money could be provided to 1,805 children who were out of school and had no money to go to school. ”

After reading the above information, I thought, "That's a lot of power. Suddenly I remembered, there is great power in numbers?

And what about the other way around? Because I thought about it: if all of the 1.3 billion people waste 1 drop of water, then a total of about 1.3 billion drops of water are wasted, then think about how much 1.3 billion drops of water weigh?

I did a little experiment: I put 1000 drops of water under the faucet, weighed it with a scale, 1000 drops of water weighed 200 grams, and I did the math again:

1300000000 1000 200 = 2600000000 (grams).

260000000 grams = 260 tons.

It's really not that I don't know, but I'm shocked: if each person uses one ton of water a month, then 260 tons of water can be used for two years. I'm going to ask my dad:

How many kilowatt-hours of electricity can be generated from 1 ton of water? Dad said, "One ton of water can generate 100 kilowatt-hours of electricity."

That means that 260 tons of water can generate 26,000 kilowatt-hours of electricity.

Wow! I was stunned that 260 tons of water could play so many roles! So now we have to save all the water and not waste a drop of water. It seems that the word "saving" is so significant!

In the case of a math diary, it means that you have done something related to math today, such as going grocery shopping or shopping, or doing some math homework.

1.Simplifying calculations.

2.Ask how much it costs to buy 4 pairs of candles, 3 cards, and 5 colored labels = 4*

USD).

It's not a math problem.

It's an English question.

Math and diaries... I was passing by.

I'm stupid... You can see it at a glance. The math teacher's math is taught by the Chinese teacher.。。。 Wowhaha.

Math diary: What is it?

Geometry in life.

In this era of rapid development of science and technology, geometric figures have become a "frequent visitor" in life, and there are geometric figures everywhere, such as: triangular bicycle racks, round manhole covers and car wheels, cylindrical flower pots, etc., which show that geometric shapes are closely related to our lives and are inseparable.

Round manhole cover (subheading, if you are an elementary school, you don't need this subheading).

A lot of mathematics has been applied to the round manhole cover:

1.We have learned that in the case of equal circumference, the area of the circle is the largest, so the manhole cover also uses this principle, so the material used in the round manhole cover is the least.

2.The circle has a center of a circle, and within the circle, the diameters are all equal, while the diagonal of the square is not equal to the length of the sides, so the bearing force of the circle is the largest.

3.The round manhole cover also has the advantage of being easy to transport.

It seems that there are many benefits to round manhole covers, which is why people do it.

People everywhere take advantage of the various properties of geometry to facilitate our lives. As Rodin said, "Life is not without beauty, but the lack of eyes to find beauty." So, it's not that there is no math in life, it's up to you to discover it.

In elementary school, the above is enough. It's still a masterpiece.

Junior high school, the following continues.

Triangle bike rack.

Why are bike racks triangular? In fact, there are many mysteries in it:

1.One of the characteristics of triangles is triangular stability.

If you take two sides of a triangle, the non-common endpoints of the two edges are connected by a third edge.

The third edge cannot be retracted or bent.

The distance between the two endpoints is fixed.

The angle between these two sides is fixed.

These two sides are optional.

The three corners of the triangle are fixed, which in turn holds the triangle in place.

The triangle has stability.

If you take two adjacent edges of the n-sided (n 4), the non-common endpoints of the two edges are connected by more than one edge.

The distance between the two endpoints is not fixed.

The angle between these two sides is not fixed.

The n-sided (n 4) is not fixed at each corner, so the n-sided (n 4) has no stability.

Therefore, using a triangular bicycle rack can play a stabilizing role.

A trademark made up of geometric figures.

In life, there are also many trademarks made up of geometric figures. For example, Audi, Chevrolet, BMW, etc. It seems that the application of geometry in life is really ubiquitous.

People use the properties of geometry to facilitate our lives. As Rodin said, "Life is not without beauty, but the lack of eyes to find beauty." So, it's not that there is no math in life, it's up to you to discover it.

The composition varies from person to person, so revise it yourself.

First, summarize what you have learned this semester, the difficulties you encountered in writing homework, and how you solved them. Finally, I would like to briefly describe my plans for the next semester.

Once, my aunt's family was renovating a new house, and they were going to buy some light bulbs, and the light bulbs were different for different rooms. My uncle made a list, 16 40W ordinary bulbs, 4 50W cold reflection directional lighting tungsten halogen bulbs (installed in the living room), 30 25W ordinary bulbs, and 6 energy-saving 11W bulbs (installed in the kitchen and bathroom), these bulbs have different functions and are also very different. My uncle asked me and my grandfather to buy it and gave him 400 yuan.

We went to the lighting market, where there are many varieties of bulbs, and the ** of various brands is also very different, I really don't know what to buy. Grandpa said to me, "You come to help me with ideas, how do I buy it?"

I said to my grandfather, "That has to be distributed." "Let's buy ordinary bulbs first, fancy 40W ordinary bulbs and 25W ordinary bulbs ** the same, 4 yuan each, so it cost 46 4 = 184 (yuan), energy-saving 11w bulb ** in 12 yuan a, so that 12 6 = 72 (yuan), in this way, we have used 184 + 72 = 256 (yuan), the rest can be used to buy the most expensive cold reflection directional lighting halotungsten lamp.

In this way, 4x+256=400, then 4x=144, x=36. According to this calculation, we have a goal, to find a similar halogen tungsten lamp to buy, and the money brought is enough.

This won't help you, because I don't know what your class content is, and if you tell me the content of your course, maybe I can write it for you.