二次根式有意义的条件是（　　）                                       ...

问题详情：

二次根式有意义的条件是（　　）                                                

A．x＞2                       B．x＜2                       C．x≥2                       D．x≤2

【回答】

C【分析】根据被开方数大于等于0列式计算即可得解．                                

【解答】解：由题意得，x﹣2≥0，                                                         

解得x≥2．                                                                                       

故选C．                                                                                            

【点评】本题考查的知识点为：二次根式的被开方数是非负数．                    

知识点：二次根式

题型：选择题