The first volume of eighth grade mathematics Qingdao electronic textbook

The first volume of Qingdao electronic textbook for eighth grade mathematics is as follows:

In life, you have seen all kinds of people. Do you know what orthomorphism is? Congruence is the basis for further study of graphs and their properties. You will go through the process of observation, experiment, induction, conjecture and exploration, master the nature and conditions of triangle congruence, and begin to draw with a ruler. Axisymmetric graphics and phenomena can be seen everywhere, which brings us the enjoyment of beauty.

Do you know the properties of axisymmetric figures? Can you use a ruler to make the angle between the bisector of the middle vertical line and the line segment? This book will help you answer these questions. On the basis of the plane graphics you have learned, you will begin to learn reasoning and proof. Based on several basic facts, this paper proves the properties and judgment methods of some simple geometric figures such as angles, parallel lines and triangles, further learns logical thinking, understands the necessity of proof, and is justified.

Do you know how to describe the concentration trend of a set of data? Can the average, median and mode be used to explain practical problems? How to describe the dispersion of a set of data? In this book, you will use variance to judge the fluctuation of data, which will help you master this knowledge and initially form the concept of statistics.

Expand knowledge:

After entering junior high school, why do some students say that mathematics is more difficult, and some students say that it is useless to learn mathematics badly. Mathematics is useless if you don't engage in mathematics in the future. In fact, it is useless to learn math well in life. Mathematics can exercise people's thinking ability and flexibility. Is it useless to learn math well? What is mathematics like in life?

What are the advantages of learning math well? Calculate the income. I am good at math, and I can do oral and mental arithmetic quickly in my daily life. Logical thinking is meticulous and scientific. People who are good at mathematics will generally improve their brain intelligence and logical thinking ability. If they are serious and scientific, they will get full marks without making mistakes.

It is suggested that being a man should be scientific and meticulous, not necessarily being a man. I summed up a sentence: To be a man in Fiona Fang, you should do things with your heart. Being a man and doing things should be wise and coordinated. If you have a good IQ, you should learn to have a high EQ.