《二次根式》这一章是初中数学中的基础内容,在勾股定理、一元二次方程的求根公式及三角形的边角关系等内容的学习过程中,都会用到本章的相关内容,也是今后学习指数函数、对数函数、三角函数等数学知识的基础.熟练掌握前面我们学习的平方根、算术平方根的概念和利用平方运算求非负数的平方根、算术平方根的方法,对本章内容的学习与深化非常有利. The chapter “Secondary Roots” is the basic content of junior middle school mathematics. It will be used in the learning process of the Pythagorean theorem, the root formula of the quadratic equation and the corner relation of the triangle, It is also the basis for learning the exponential function, logarithmic function, trigonometric function, etc. Proficiency in the square root and arithmetical square root we studied in the past and the square root and non-negative square root of arithmetic, the square root of arithmetic, the learning of this chapter And very beneficial to deepen.