函數(shù)的圖象大致是(  )

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向量,滿足的夾角為60°,則 (  )

      A.           B.             C.              D. 

 

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復(fù)數(shù)(i為虛數(shù)單位),則復(fù)數(shù)z的共軛復(fù)數(shù)為

    A.2- i        B.2+i             C.4- i            D.4+i

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  如圖:三棱柱

,,E是的中點.

  (Ⅰ)若,求證:平面平面;

   (Ⅱ)若,求二面角的余弦值;

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已知角的頂點與原點重合,始邊與x軸的正半軸重合,終邊在直線y =2 x上,則  (  。                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  

A.                B.               C.               D.

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 設(shè)是首項為1的正項數(shù)列,且1,2,3,…),則它的通項公式是=          。

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已知函數(shù)>0)的圖象在點(1,)處的切線方程為。

⑴用表示出;

⑵若上恒成立,求的取值范圍;

⑶證明:  。

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畫出函數(shù)的圖象。

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已知拋物線C:上一動點M,設(shè)M到拋物線C外一定點A(6,12)的距離為,M到定直線的距離為,若+的最小值為14,則拋物線C的方程為____________________.

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