二次根式有意義的條件是（　　）                                       ...

問題詳情：

二次根式有意義的條件是（　　）                                                

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

【回答】

C【分析】根據被開方數大於等於0列式計算即可得解．                                

【解答】解：由題意得，x﹣2≥0，                                                         

解得x≥2．                                                                                       

故選C．                                                                                            

【點評】本題考查的知識點為：二次根式的被開方數是非負數．                    

知識點：二次根式

題型：選擇題