The first chapter of the seventh grade book of Shandong Education Press The knowledge points in the first chapter of the seventh grade volume of Shandong Education Press 2. Organize the wonderful questions 3. Collect historical stories, mathematicians and interesting stories related to the content of this chapter Write 4 Essays (at least 300 words) to talk about harvest, feeling, experience, discovery, thinking, perception, etc

The first chapter of the seventh grade book of Shandong Education Press The knowledge points in the first chapter of the seventh grade volume of Shandong Education Press 2. Organize the wonderful questions 3. Collect historical stories, mathematicians and interesting stories related to the content of this chapter Write 4 Essays (at least 300 words) to talk about harvest, feeling, experience, discovery, thinking, perception, etc

Herman wail, a famous mathematician in the 20th century, said, "symmetry is an idea that people pursue all their lives and create order, beauty and perfection..."
There are too many small stories. If you think about it, you'd better not be limited to mathematics. You should think about the part of plane mirror imaging in physics
Like monkeys fishing for the moon or something
Two new residential areas have been built in a development zone: Area A and area B (as shown in the figure). Now we need to establish an interface from one place of the main gas pipeline to supply gas to these two areas at the same time. Excuse me, where should this interface be built to make the pipeline shortest? What is the problem of using symmetry to find the maximum value