有理數﹣3的倒數是（　　）                                          ...

問題詳情：

有理數﹣3的倒數是（　　）                                                                   

A．                           B．3                            C．﹣                       D．﹣3

【回答】

C

【考點】倒數．                                                                                 

【分析】兩個數的乘積為1，那麼這兩個數互為倒數．                                   

【解答】解：（﹣3）×（﹣）=1．                                                     

所以有理數﹣3的倒數是﹣．                                                               

故選C．                                                                                            

【點評】本題考查倒數的定義：若兩個數的乘積是1，我們就稱這兩個數互為倒數．   

知識點：有理數

題型：選擇題