Textbooks play an important part in teaching and developing students’ learning orientation. Basing on the study of the Theorem 3 cited in Algebraic and Analysis Textbook of current grade 11, our goal is to focus on the importance of teaching implementation in order to faclitate students to comprehend knowledge mentioned in textbooks and to apply such basic knowledge into doing related exercises or topics. By that means, it is expected to improve students not only mathematics understanding but also general intellectual development.