Is our math books have appeared appropriate and desirable?

These days, we see many mistakes in mathematical textbooks of high school from many wrong shapes and misprints to many other flaws. Unfortunately, not only these mistakes have not been corrected but also have increased because the textbooks have been written and changed quickly and carelessly. Furthermore, the authors are not familiar with students and high schools well enough. So, they bring some questions up which are puzzling for students and their teachers. Sometimes these mistakes cause bad education in other aspect of student’s lives. We want to indicate some of these mistakes in textbooks of high schools. Teachers have to spend more power to understand textbooks and author’s purposes instead of teaching. Therefore, they prefer to leave textbooks and use their notes and other books. Consequently, it increases expenses for society and family. In this decade that students can easily draw and analyze the chart of complicated functions by their mobiles, existence of error in charts of textbooks is not accepted. The authors can bring any subject up as mathematical questions in any field because the only department which analyzes textbooks is ministry of education. Should not the authors be responsible for the result of their work? Is it true that anyone who has higher education can be the author of mathematical textbooks without any experience in teaching at high schools?