二次根式运算容易出错,其主要原因就是忽视了题目中的隐含条件.所以,在解决有关根式的一些题目时,要认真审题,注意挖掘与二次根式定义、性质、运算法则等有关的隐含条件.1.从定义中挖掘隐含条件二次根式的定义是:一般地,式子a~(1/2)(a≥0)叫做二次根式,其中条件a≥0常作为隐含条件放置在题目中.若不注意挖掘,要么对问题一筹莫展,要么导致错误的结论. It is easy to make mistakes because the root-mean-square problem is easy to make mistakes. Therefore, we should seriously examine the problems in resolving some problems related to the root, and pay attention to mining related to the definitions of quadratic roots, properties, algorithms, etc. Implicit conditions .1. Mining from the definition of implicit conditions Quadratic root definition is: In general, the formula a ~ (1/2) (a ≥ 0) is called the quadratic root, where the condition a ≥ 0 often as a hidden Containing conditions placed in the title.If you do not pay attention to mining, either to help the problem, or lead to wrong conclusions.