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				(6)在等比數(shù)列的值為    (A)  9        (B) 1            (C)2                (D)3			【查看更多】
			


		
           
          


		
          
		
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           在等比數(shù)列的值為（  ） 
          


          A．1     
    B．2            C．3            D． 9 
          


           
          

			
          
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          在等比數(shù)列的值為（    ）                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                
          


              A.9          
B．1  C．2    
D．3
          


           
          

			
          
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          在等比數(shù)列的值為（    ）                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                
          


              A.9          
B．1  C．2    
D．3
          


           
          

			
          
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          在等比數(shù)列的值為 （   ） 
          


              A．1            B．2              
  C．3    
           D． 9   
          


           
          

			
          
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          在等比數(shù)列的值為  （    ）
            
                 A．9                B．1                 C．2         D．3
          

			
          
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              2009.3
          一、選擇題
          （1）B  （2）A  （3）B （4）C （5）B （6）D
          （7）D   （8）C  （9）C （10）B （11）A （12）C
          二、填空題
          


            1. 
 
              
  
  
              
   
              
    
    
              
    
              1,3,5
              三、解答題
              （17）解:（Ⅰ）-            
---------------------------2分
              高三年級(jí)人數(shù)為-------------------------3分
              現(xiàn)用分層抽樣的方法在全校抽取48名學(xué)生，應(yīng)在高三年級(jí)抽取的人數(shù)為
              (人).                      
--------------------------------------6分
              （Ⅱ）設(shè)“高三年級(jí)女生比男生多”為事件，高三年級(jí)女生、男生數(shù)記為.
              由（Ⅰ）知且
              則基本事件空間包含的基本事件有
              共11個(gè),    
------------------------------9分
              事件包含的基本事件有
              共5個(gè)    
                             
--------------------------------------------------------------11分
              答：高三年級(jí)女生比男生多的概率為.  …………………………………………12分
              （18）解：（Ⅰ）  …………2分
              在中，由于，
                                                      …………3分
              又，
                                      
              又，所以，而，因此.…………6分
                 （Ⅱ）由，
              由正弦定理得                                …………8分
              ，
              即，由（Ⅰ）知，所以    …………10分
              由余弦弦定理得 ，     …………11分
              ，
                          
                                  …………12分
              （19）（Ⅰ）證明：∵、分別為、的中點(diǎn)，∴.
                   又∵平面平面
              ∴平面                                        
…………4分
              （Ⅱ）∵，，∴平面.
              又∵，∴平面.
              ∵平面,∴平面平面.              
…………8分
              （Ⅲ）∵平面，∴是三棱錐的高.
              在Rt△中，.
                  在Rt△中，.
               ∵，是的中點(diǎn)，
              ∴,
              故.        ………………12分
              （20）解：（Ⅰ）依題意得
                                          
…………2分 
               解得，                                            
…………4分
              .       …………6分
                 （Ⅱ）由已知得，                 
…………8分
                                                                      
………………12分
              （21）解：（Ⅰ）
                    令=0,得                       
………2分
              因?yàn)?sub>，所以可得下表：
              0
              +
              0
              -
              ㄊ
              極大
              ㄋ
                       
                                                ………………4分
              因此必為最大值,∴，因此， 
                   ，
                  即，∴，
               ∴                                       ……………6分
              （Ⅱ）∵，∴等價(jià)于， ………8分
               令，則問題就是在上恒成立時(shí)，求實(shí)數(shù)的取值范圍，為此只需，即，                
…………10分
              解得，所以所求實(shí)數(shù)的取值范圍是[0，1].           
………………12分
              （22）解:（Ⅰ）由得，，
              所以直線過定點(diǎn)（3，0），即.                      
…………………2分
               設(shè)橢圓的方程為, 
              則,解得，
              所以橢圓的方程為.                   
……………………5分
              （Ⅱ）因?yàn)辄c(diǎn)在橢圓上運(yùn)動(dòng),所以，      ………………6分
              從而圓心到直線的距離
              所以直線與圓恒相交.                            
……………………9分
              又直線被圓截得的弦長(zhǎng)
              ，      
…………12分
              由于,所以,則,
              即直線被圓截得的弦長(zhǎng)的取值范圍是.  …………………14分
               
               
               
              		
              
	
	

              
	



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