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    若a∶3 =b∶4 =c∶5 , 且a+b-c=6, 则a= .b= .c= . 【查看更多】

     

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    若,且,则（    ）

    A、7         B、－1       C、 7，－1     D、7，－7                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               

     

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    若,且,则（   ）
    A．7B．－1C．7，－1D．7，－7

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    若,且,则
    [     ]
    A、7        
    B、－1      
    C、 7，－1    
    D、7，－7

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    若,且,则（   ）

    A．7B．－1C．7，－1D．7，－7

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    若且，，则=       ，     

     

     

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