Today's math class, the teacher gave an example, the topic is:

The school organized teachers and students to visit the Science and Technology Museum. There are 100 students and 50 teachers. Admission to the Science and Technology Museum is for adults 10 yuan, with half price for children. Q: How much is the charge?

Xiaohong raised her hand, and the teacher ordered Xiaohong to answer on the blackboard. Xiaohong's formula is as follows:

10/2=5 (yuan)

100*5=500 (yuan)

50* 10=500 (yuan)

500+500= 1000 (yuan)

A: Its price is 1000 yuan.

The teacher said, "Well, is there any other way?" Xiaoyue raised her hand, and the teacher ordered Xiaoyue to answer on the blackboard. The formula for abortion is as follows:

( 100/2)+50

=50+50

= 100 (name)

100 *10 =1000 (yuan)

A: Its price is 1000 yuan.

The teacher said, "Very well, please come on stage and explain."

"I mean 100/2=50 (name) first. It means: because the adult fare is twice that of children, there are 100 children, and the required fare is equal to 50 adults. Add 50+50= 100 (name), that is, add teachers, one * * * has 100 "adults", and finally use100 *100 =1000 (. Abortion solution theory.

"Very well, thank you for your abortion, your explanation is very comprehensive. What we are learning today is' smart counting'. Ok, class is over. " The teacher said.

Mathematical paper

Mathematical paper

Mathematics is everywhere in the world. Really, as long as you pay attention to observation and be good at thinking, you will feel as if you are in the ocean of mathematics. Yes, mathematics is everywhere. This holiday, I deeply felt this.

There is a crazy song in my stomach for no reason. "I'm so hungry." I groaned. "Come on, have an apple!" It's better to be a mother, "but ..." "But what? Eat an apple, what's the buts? " I asked with a smile, reaching for a big red apple. Who knows, my mother grabbed the apple and took it away, mysteriously. I have a blank face. What medicine does mother sell? I am impatient. "Mom, stop it. Can people eat? " Mom still washes apples with a smile. "Come on, who said you wouldn't eat? Didn't I wash it? " "Oh!" I still look puzzled. "However, I still have a request." I knew something was wrong when I finally said it. "What requirements?" I'm a little angry. I just ate an apple. Why are there so many demands? "Don't you study volume?" "Yes, what's the matter?" Does this have anything to do with eating apples? I thought to myself. "Then can you bring mathematical knowledge into your life and calculate the volume of this apple?" Mom smiled again, as if she looked down on me, and a force rose in her heart. Well, I must show it to you! Sure!

So, I quickly took this mouth-watering red apple in my hand and wondered how to calculate the volume. Apple is neither a cuboid nor a cube, nor a cylinder. How to calculate its volume? I am vacillating and have no idea. At this time, my stomach is still growling. I can't keep my promise and eat it. I can't let my mother look down on me. Please, there must be a good way. So I summon up courage again, hold back my hunger, and continue to bury my head in thinking.

After a while, I finally realized that I couldn't use the cup. First, I put some water in it and recorded the water level. Then put the apple into the water. At this time, the water level has risen a lot. Then write down the rising water level. Finally, the size of the apple can be calculated by subtracting the previous water level from the rising water level. I was so happy that I reported the experimental results to my mother. My mother smiled with satisfaction this time.

I munch on apples, which is the sweetest food!

Mathematics is everywhere, don't you think?

Mathematical paper

Mathematical paper

"If you encounter a problem, you won't think about it yourself and ask again? ! "Mom flew into a rage. Oh, who told me this brain is not a math brain? Do a slightly more difficult question and start asking questions. Well, think for yourself!

I just read this math problem: if students plant trees, if each person plants 8 trees, there will be 7 fewer trees; If there are 7 trees for each race, there will be 8 more trees. How many students are there? How many trees are they going to plant? Damn, it's profit and loss problem again. Can't you think of some other problems in this happy Olympic training? But gas returns to gas, don't you still have to do it in the end? There are two solutions to this problem. Each person will plant 8 trees, and each person will plant 7 trees, so that each person will plant less 1 tree, and the original 7 trees will become a variety of 8 trees. The total difference between the two distributions is: 7+8 = 65,438+05 (tree). Eh, isn't this the same as the previous example? First, the individual differences are found according to the scheme, then the total differences are found according to the results, and then the number of individual differences contained in the total differences is found. Finally, the result is obtained according to the mathematical formula: total difference ÷ individual difference = number. This formula can also be used in this problem. Get:

Student: (7+8)÷(8-7)= 15 (a)

Tree: 8×15-7 =1kloc-0/3 (tree) or15× 7+8 =1kloc-0/3 (tree).

Didn't the answer come out? Students 15, one will plant 1 13 trees.

After careful thinking, I got my ideas and interests, so I went down to do it: the students of the drum team lined up, and if there were 8 people in each row, there would be 24 more; If there are 9 people in each row, there are 4 more. How many lines are there in one stop? How many students are there? Similarly, the total difference between the two distributions is 24-4=20 (person), and then the formula is obtained:

Rows: (24-4)÷(9-8)=20 (rows)

Student: 20×8+24= 184 or 20×9+4= 184 (person).

The more I do, the happier I am. I can solve so many difficult problems and get an important formula: total difference-individual difference = number, which can be better used to solve difficult problems in the future.

Doing it, I gradually realized that it is not difficult to do difficult problems.