亚洲人成影院在线播放高清|久久精品视频免费播放国产|日本亂倫近親相姦在线播放|国产九九免费观看思思

    • 

  • 

    <td id="rjvax"><strong id="rjvax"></strong></td>
    


    
	
    
		
	
    
	
    
		
    
			
		
    
		
    
	
    

    



    

    

    

	
    
	

    

    
	
    
				
    

			
				若輸出的值是4.			【查看更多】
			


		
     
    


		
    
		
    題目列表(包括答案和解析)
    

		
		
    

    


    
	
    						
    
		
    1-10．CDBBA   CACBD
    11．6ec8aac122bd4f6e 12. ①③④  
13.-2或1 
14. 6ec8aac122bd4f6e、6ec8aac122bd4f6e 
15.2  16. 6ec8aac122bd4f6e 17.6ec8aac122bd4f6e.
    18．
    解：（1）由已知6ec8aac122bd4f6e6ec8aac122bd4f6e          7分
    （2）由6ec8aac122bd4f6e                                                                   10分
    由余弦定理得6ec8aac122bd4f6e                          14分
     
    19.（1）證明：∵PA⊥底面ABCD，BC6ec8aac122bd4f6e平面AC，∴PA⊥BC,                                  3分
    ∵∠ACB=90°，∴BC⊥AC，又PA∩AC=A，∴BC⊥平面PAC.                             5分
    （2）解：過C作CE⊥AB于E，連接PE，
    ∵PA⊥底面ABCD，∴CE⊥面PAB，
    ∴直線PC與平面PAB所成的角為6ec8aac122bd4f6e，                                                     10分
    ∵AD=CD=1，∠ADC=60°，∴AC=1，PC=2,
    6ec8aac122bd4f6e中求得CE=6ec8aac122bd4f6e，∴6ec8aac122bd4f6e.                                                  14分
     
    6ec8aac122bd4f6e20．解：（1）由6ec8aac122bd4f6e①，得6ec8aac122bd4f6e②，
    ②-①得：6ec8aac122bd4f6e.                              4分
    （2）由6ec8aac122bd4f6e求得6ec8aac122bd4f6e.          7分
    ∴6ec8aac122bd4f6e，6ec8aac122bd4f6e   11分
    6ec8aac122bd4f6e
    ∴6ec8aac122bd4f6e.                  
                                              14分
     
    21．解：
    （1）由6ec8aac122bd4f6e得c=1                                                                                       1分
    6ec8aac122bd4f6e，                                                         4分
    6ec8aac122bd4f6e得6ec8aac122bd4f6e
    ∴6ec8aac122bd4f6e                                                                                        5分
    （2）6ec8aac122bd4f6e得6ec8aac122bd4f6e，6ec8aac122bd4f6e時(shí)取得極值.由6ec8aac122bd4f6e，6ec8aac122bd4f6e 得6ec8aac122bd4f6e∴6ec8aac122bd4f6e.                                                                                          8分
    6ec8aac122bd4f6e，6ec8aac122bd4f6e，∴當(dāng)6ec8aac122bd4f6e時(shí)，6ec8aac122bd4f6e， 
    ∴6ec8aac122bd4f6e在6ec8aac122bd4f6e上遞減.                                                                                       12分
    又6ec8aac122bd4f6e∴函數(shù)6ec8aac122bd4f6e的零點(diǎn)有且僅有1個(gè)     15分
     
    22．解：(1) 設(shè)6ec8aac122bd4f6e，由已知6ec8aac122bd4f6e，
    6ec8aac122bd4f6e，                                        2分
    設(shè)直線PB與圓M切于點(diǎn)A，6ec8aac122bd4f6e
    又6ec8aac122bd4f6e，
    6ec8aac122bd4f6e6ec8aac122bd4f6e                                                 6分
    (2) 6ec8aac122bd4f6e點(diǎn) B（0，t），點(diǎn)6ec8aac122bd4f6e，                                                                7分
    進(jìn)一步可得兩條切線方程為：
    6ec8aac122bd4f6e，                                   9分
    6ec8aac122bd4f6e6ec8aac122bd4f6e，6ec8aac122bd4f6e，
    6ec8aac122bd4f6e，6ec8aac122bd4f6e，                                          13分
    6ec8aac122bd4f6e，又6ec8aac122bd4f6e時(shí)，6ec8aac122bd4f6e，
    6ec8aac122bd4f6e6ec8aac122bd4f6e面積的最小值為6ec8aac122bd4f6e                                                                            15分
     
     
    		
    
	
    
	
    
		
    


    同步練習(xí)冊答案