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7.二元函數(shù)的定義域記為,則函數(shù)=[xlin(y-x)]

   的定義域D所表示的平面區(qū)域?yàn)?nbsp;                                                                      (    )

試題詳情

       A.                 B.                 C.                   D.

試題詳情

   率為,則的值為                                                                                      (    )

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6.橢圓與直線交于A、B兩點(diǎn),過原點(diǎn)與線段AB中點(diǎn)的直線的斜

試題詳情

       C.奇函數(shù)且它的圖象關(guān)于點(diǎn)(,0)對(duì)稱

       D.奇函數(shù)且它的圖象關(guān)于點(diǎn)(π,0)對(duì)稱

 

 

試題詳情

       B.偶函數(shù)且它的圖象關(guān)于點(diǎn)(,0)對(duì)稱

試題詳情

   則函數(shù)是                                                                                   (    )

       A.偶函數(shù)且它的圖象關(guān)于點(diǎn)(π,0)對(duì)稱

試題詳情

5.已知函數(shù)(a、b為常數(shù)a≠0,x∈R)在處取得最小值,

試題詳情

4.設(shè)Sn為數(shù)列{an}前n項(xiàng)和,且an=-2n+1,則數(shù)列的前11項(xiàng)和為            (    )

       A.-45                    B.-50                     C.-55                    D.-66

試題詳情

   相切,則實(shí)數(shù)的值為                                                                                      (    )

       A.0或10              B.-2或8                C.-3或7               D.1或11

試題詳情


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