1, skillfully solve the problem of "eggs"

On Saturday afternoon, my mother and I went to visit my kind grandmother. My uncle gave me a question: Grandma now has 12 eggs and 1 chicken, an old hen that lays an egg every day. Then think about it. If Grandma eats two eggs a day, how many days can she eat them continuously?

Without thinking, I replied, "You can eat 12÷2=6 days." At this time, my mother reminded me: "I just got 12, and I can eat eggs for a few days." But in these six days, the hen laid a few eggs. How many days can these eggs last? " I quickly replied: "6÷2=3 days. In these three days, the hen has laid three more eggs, and she can still eat 1 day, and there is one left. In this 1 day, the hen laid 1 egg,1+1= 2,2 ÷ 2 =1day. Therefore, * * * can eat 6+3+1+1=1day. Right? " My uncle gave me a thumbs-up sign, and my mother and grandmother showed a gratified smile.

After explaining the questions raised by my uncle, I realized a moral problem: everything should be good at thinking and constantly pursuing perfection.

Tuesday, April 65438 +00 Weather: sunny

The problem of "discount" in life

In life, everything is inseparable from mathematics, which is closely related to our lives. If we can't learn math well, you will be cheated if you live in this ever-changing society. If you buy clothes in the market, the clothes are just 75% off, but you didn't learn math well and didn't even notice the 15% off. You will regret it afterwards.

In mathematics, there will inevitably be some problems. In fact, these problems are not very difficult, just adding a little "seasoning" on the original basis to make it very flexible. Such as this question: "A commodity is sold after the cost price is increased by 30%. Later, due to seasonal reasons, it was sold at a 20% discount. After the price reduction, the price of each product is 104 yuan. Is it a loss or a profit to sell a commodity? What is your salary or income? " In fact, this question is flexible, but as long as you clear your mind and think carefully, you will certainly be able to work it out. To solve this problem, first of all, we must find out whether the "ten" units sold at a 30% price increase are the same as those sold at a 20% discount. What is their unit "ten"? When you find out which of these two units "1" is, you will start to calculate the price before the price reduction by reverse strategy, and then calculate the cost price, and then compare it with the goods after the price reduction. If it is earned, it is the cost price 104, and if it is lost, it is-104 yuan. The correct expression of this question is as follows:

104/80% = 130 yuan

130 ÷ (160%) =100 yuan

100 yuan < 104 yuan

104- 100=4 yuan

Therefore, the sale of this commodity is profitable, earning 4 yuan.

You see, this question is simple! In fact, as long as you are good at thinking, there is no problem you can't overcome. Isn't this the saying "where there is a will, there is a way"? Therefore, in the face of difficulties, we should try our best to overcome them instead of running away when we see them.

Thursday, April 12 is cloudy and sunny.

The application of mathematical knowledge in life is everywhere, and so is mathematical knowledge in life.

I remember when I was a child, whenever I saw the "discount" problem in front of the supermarket or store, I couldn't help asking my mother, "Mom, how much did I lose after this discount?" And my mother always speaks very briefly, and my mind is still in a mess. It was not until I learned the knowledge of "discount" this year that I solved my doubts.

Just the other day, I helped my mother solve a discount problem in the supermarket. That day, my mother and I went to Yonghui Supermarket to play. As soon as I entered the supermarket, there were countless people in the supermarket. My mother and I pushed the shopping cart out of the door first. The first place we came to was the clothing area. When I got there, I saw all kinds of clothes "squeezing" into my eyes. After repeated selection, my mother took a fancy to a dress with an original price of 235 yuan. On this day, there was an activity in the supermarket, and all the clothes were 15% off. I watched another issue on sale and thought, it's time for me to show my talents. "The heart is not as good as action." I looked at the price on the clothing label and then at the discount. I immediately figured it out in my mind, but I still worked out such a large number by mouth, so I had to borrow my mother's mobile phone. After the calculation of the mobile phone, the number finally came out. I was ecstatic and said to my mother, "I worked it out!" " I figured it out! The current price is 223.25 yuan! "My mother gave me an approving look.

Time flies. It's time for us to go home. On the way, even now, I still have a sweet taste of success in my heart.

April 10 Tuesday is fine.

Students, when you do math application problems, can't you tell the meaning of the terms in the application problems? Do you often misunderstand the meaning of the terms in the title? Today I summed up the characteristics of terms from the book, and I'll tell you.

Let me tell you the difference between the words "increase, increase, increase to". "Increase" and "improvement" are actually the same, both of which mean more than the original figure. And "increasing to" refers to increasing the original number to get a certain number. For example, the price of "Olympiad Star" rose from 15 yuan to 16 yuan. How much did the price increase? At this time, if the formula is "16 ÷15x100%", it is wrong. The correct formula should be "(16-15) ÷15x100". Then, the same is true of "restore, restore, restore to".

Easy to remember! Next, I want to talk about the difference between the two predicates of "increasing several times" and "expanding several times". "Multiplication" means that the part that is more (increased) than the original number is several times the original number, while "multiplication" means that the "new number" (that is, the extension number) is several times the original number. Let me give you an example: the turnover of a shopping mall in March was 6.5438+0 million yuan, and the turnover in April was twice that in March. What's the turnover in April? The formula of this problem should be: 100+ 100X2. If the word "increase" in the title is changed to "expand". That formula should be: 100X2. The same is true of "reducing several times and reducing several times".

Finally, let me talk to you about "shrinking". "Reduce", "reduce to" and "reduce by one point" all mean to reduce. But they are different. "Shrinking" refers to the reduced part: "Shrinking to" refers to the result of shrinking, such as a rectangle of 3 square centimeters, which is reduced to one third of the original. How many square meters and centimeters is the reduced area? The correct formula is 3 times 1/3. If it is "minus one third", it is three times (1- one third). The same is true of "expansion".

Speaking of which, I'll send you a sentence: "The small clause is not simple. Once you want to make a mistake on the whole problem, just distinguish the differences and solve the problem later. "