Close? Keys? Words: 400 words in the fourth grade of mathematics primary school

Words: 400 words composition

This article applies to: the fourth grade of primary school.

Composition source:

This composition is about 400 words in the fourth grade of primary school. The topic is "Mysteries in Mathematics". Welcome to contribute. Mathematics is a profound and simple word. Some people think that mathematics is a problem composed of many numbers and words, which is very boring. But some people will find the answer from this string of numbers, and some people will find new problems from it, so as to explore and verify until they find the answer and find the mystery. I remember a few days ago, when the teacher commented on "learning and training activities", he talked about a topic: As shown in Figure 7.2-5, the bisector BP and CD of the two outer corners of the triangle ABC intersect at point P, and the known angle A = 80 degrees, and the degree of angle P is found. This question is accompanied by a picture. As the teacher wrote, he said, "As we all know, the sum of the inner angles of a triangle is 180 degrees. If you ask the degree of the third angle, you must know the degree of the other two angles. But now, the title only gives the degree of an angle. It is difficult to add up the angles that are not given. " This problem seems difficult, but as long as you are willing to use your head, you will find that it is not as difficult as you think. Nothing is difficult in the world, as long as you are willing to climb!

When you work out the answer, you will find that there is so much knowledge in a small book of more than ten words, and you can't help but sigh: how wonderful and interesting mathematics is!

In ancient Zu Chongzhi, pi was accurate to the seventh place after the decimal point. But without the help of advanced technologies such as computers, we can imagine how much perseverance is needed behind this success. You don't need perseverance if you want to explore the mysteries in the kingdom of mathematics. Only with this perseverance can you find the truth of mathematics and realize the mystery of mathematics. Seeking truth in complex mathematics is also the most interesting thing in life.