本章涉及的概念有:二次根式、最简二次根式、同类二次根式.深刻地理解这些概念可以帮助我们更好更快地进行二次根式的化简和运算.在课程标准中,二次根式属于“数与代数”领域,是对“实数”“代数式”等内容的延伸和补充,也是同学们后续学习的理论基础,在初中数学中具有重要的地位.1.二次根式 The concepts involved in this chapter are: the second root, the most simple root of the second radical, similar to the root of the root deep understanding of these concepts can help us better and faster quadratic root simplification and computing.In the course standard, two The secondary root belongs to the field of “number and algebra”, which is the extension and supplement of “real number ” “algebra ”, which is also the theoretical basis of the students’ follow-up study and plays an important role in the junior high school mathematics.1 Secondary root