要解决同类二级根式的识别问题，理解同类二次根式的概念和掌握识别同类二次根式的方法和步骤是首先要解决的两个问题．几个二次根式化成最简二次根式以后，如果它们的被开方数相同，那么这几个二次根式叫做同类二次根式．这就是同类二次根式的定义．由此定义不难知道识别同类? To solve the identification problem of the same two-level roots, understanding the concept of the same secondary roots and grasping the methods and steps of identifying the secondary roots of the same type are the two problems to be solved first. After several secondary roots are converted into the simplest secondary roots, if they have the same number of square roots, then these secondary roots are called secondary roots of the same type. This is the definition of the same quadratic root. This definition is not difficult to know to identify the same class?