已知是定義在上的奇函數(shù).且.若將的圖象向右平移一個(gè)單位后.則得到一個(gè)偶函數(shù)的圖象.則 查看更多

 

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已知是定義在上的奇函數(shù),且,若、,,有

(1)判斷函數(shù)上的單調(diào)性,并證明你的結(jié)論;

(2)若對(duì)所有的恒成立,求實(shí)數(shù)的取值范圍。

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已知是定義在上的奇函數(shù),且,若,,有,判斷函數(shù)上是增函數(shù)還是減函數(shù),并證明你的結(jié)論.

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已知是定義在上的奇函數(shù),且,若,恒成立.

(1)判斷上是增函數(shù)還是減函數(shù),并證明你的結(jié)論;

(2)若對(duì)所有恒成立,求實(shí)數(shù)的取值范圍。

 

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已知是定義在上的奇函數(shù),且,若恒成立.

(1)判斷上是增函數(shù)還是減函數(shù),并證明你的結(jié)論;

(2)若對(duì)所有恒成立,求實(shí)數(shù)的取值范圍。

 

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已知是定義在上的奇函數(shù),且,若時(shí),有成立.

(1)判斷上的單調(diào)性,并證明;

(2)解不等式:;

(3)若當(dāng)時(shí),對(duì)所有的恒成立,求實(shí)數(shù)的取值范圍.

 

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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

6ec8aac122bd4f6e6ec8aac122bd4f6e   11分

6ec8aac122bd4f6e

6ec8aac122bd4f6e.                                                                 14分

 

21.解:

(1)由6ec8aac122bd4f6e得c=1                                                                                       1分

6ec8aac122bd4f6e,                                                         4分

6ec8aac122bd4f6e6ec8aac122bd4f6e

6ec8aac122bd4f6e                                                                                        5分

(2)6ec8aac122bd4f6e6ec8aac122bd4f6e,6ec8aac122bd4f6e時(shí)取得極值.由6ec8aac122bd4f6e6ec8aac122bd4f6e6ec8aac122bd4f6e6ec8aac122bd4f6e.                                                                                          8分

6ec8aac122bd4f6e,6ec8aac122bd4f6e,∴當(dāng)6ec8aac122bd4f6e時(shí),6ec8aac122bd4f6e,

6ec8aac122bd4f6e6ec8aac122bd4f6e上遞減.                                                                                       12分

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

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

6ec8aac122bd4f6e6ec8aac122bd4f6e6ec8aac122bd4f6e,

6ec8aac122bd4f6e6ec8aac122bd4f6e,                                          13分

6ec8aac122bd4f6e,又6ec8aac122bd4f6e時(shí),6ec8aac122bd4f6e

6ec8aac122bd4f6e6ec8aac122bd4f6e面積的最小值為6ec8aac122bd4f6e                                                                            15分

 

 


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