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題目列表(包括答案和解析)

一、選擇題(每小題5分,共50分)

    1.C  2.B  3.D  4.A  5.C  6.B  7.A  8.C  9.B  10.D

二、填空題(每小題4分,共24分)

11.84  12.(3,6ec8aac122bd4f6e) 13.6ec8aac122bd4f6e 14.±2  15.1:2  16.4

三、解答題(本大題共6小題,共76分)

17.(本題12分)

解:(Ⅰ)∵6ec8aac122bd4f6e,

6ec8aac122bd4f6e          ………………………(2分)

6ec8aac122bd4f6e    ………………………(3分)

6ec8aac122bd4f6e              ……………………(4分)

∵在6ec8aac122bd4f6e中,6ec8aac122bd4f6e

6ec8aac122bd4f6e                             ………………………(5分)

(Ⅱ)設(shè)6ec8aac122bd4f6e分別是6ec8aac122bd4f6e6ec8aac122bd4f6e的對(duì)邊,

∵?6ec8aac122bd4f6e

6ec8aac122bd4f6e

6ec8aac122bd4f6e    ①                                          ……………………(6分)

由正弦定理:6ec8aac122bd4f6e,得 6ec8aac122bd4f6e             ……………………(7分)

6ec8aac122bd4f6e

6ec8aac122bd4f6e    ②                                          ……………………(8分)

由①②解得6ec8aac122bd4f6e                                    ……………………(9分)

由余弦定理,得6ec8aac122bd4f6e                       ………………(10分)

                 6ec8aac122bd4f6e

                 6ec8aac122bd4f6e                                       ………………(11分)

6ec8aac122bd4f6e,即邊6ec8aac122bd4f6e的長(zhǎng)為6ec8aac122bd4f6e。                              ……………………(12分)

 

18.(本題12分)

解:(Ⅰ)記“甲投籃1次投進(jìn)”為事件6ec8aac122bd4f6e,“乙投籃1次投進(jìn)”為事件6ec8aac122bd4f6e, “丙投籃1次投進(jìn)”為事件6ec8aac122bd4f6e,“3人都沒(méi)有投進(jìn)”為事件6ec8aac122bd4f6e,

6ec8aac122bd4f6e6ec8aac122bd4f6e,6ec8aac122bd4f6e

6ec8aac122bd4f6e                ………………………(2分)

       6ec8aac122bd4f6e

       6ec8aac122bd4f6e                     …………………………(4分)

∴3人都沒(méi)有投進(jìn)的概率為6ec8aac122bd4f6e                           …………………………(5分)

(Ⅱ)6ec8aac122bd4f6e的可能取值為6ec8aac122bd4f6e6ec8aac122bd4f6e,故:

6ec8aac122bd4f6e,                           …………………(6分)

6ec8aac122bd4f6e,                           …………………(7分)

6ec8aac122bd4f6e,                       ………………………(8分)

6ec8aac122bd4f6e,                          …………………(9分)

6ec8aac122bd4f6e的分布列為:

6ec8aac122bd4f6e

0

1

2

3

6ec8aac122bd4f6e

6ec8aac122bd4f6e

6ec8aac122bd4f6e

6ec8aac122bd4f6e

6ec8aac122bd4f6e

6ec8aac122bd4f6e的數(shù)學(xué)期望:

6ec8aac122bd4f6e,                 ……………(12分)

 

19.(本題12分)

解:以6ec8aac122bd4f6e為坐標(biāo)原點(diǎn),射線6ec8aac122bd4f6e分別為6ec8aac122bd4f6e軸,6ec8aac122bd4f6e軸,軸的正半軸建立如圖所示的空間直角坐標(biāo)系.                                      ………………………(1分)

設(shè)6ec8aac122bd4f6e,由已知得:

6ec8aac122bd4f6e,                   ……………(2分)

(Ⅰ)當(dāng)6ec8aac122bd4f6e時(shí),6ec8aac122bd4f6e6ec8aac122bd4f6e,  

6ec8aac122bd4f6e, =6ec8aac122bd4f6e, 6ec8aac122bd4f6e,                  ……………(3分)

?=6ec8aac122bd4f6e,?=6ec8aac122bd4f6e,                                    ……………………(4分)

6ec8aac122bd4f6e。                         …………………………………(5分)

6ec8aac122bd4f6e,

6ec8aac122bd4f6e平面6ec8aac122bd4f6e

∴平面6ec8aac122bd4f6e6ec8aac122bd4f6e平面6ec8aac122bd4f6e。                       …………………………………(6分)

6ec8aac122bd4f6e(Ⅱ)∵6ec8aac122bd4f6e,

6ec8aac122bd4f6e,

6ec8aac122bd4f6e6ec8aac122bd4f6e,6ec8aac122bd4f6e

設(shè)6ec8aac122bd4f6e6ec8aac122bd4f6e平面6ec8aac122bd4f6e,

6ec8aac122bd4f6e6ec8aac122bd4f6e?=6ec8aac122bd4f6e,6ec8aac122bd4f6e?=6ec8aac122bd4f6e

6ec8aac122bd4f6e                  

6ec8aac122bd4f6e6ec8aac122bd4f6e                  設(shè)6ec8aac122bd4f6e6ec8aac122bd4f6e…(8分)

設(shè)6ec8aac122bd4f6e6ec8aac122bd4f6e平面6ec8aac122bd4f6e,

6ec8aac122bd4f6e6ec8aac122bd4f6e?=6ec8aac122bd4f6e,6ec8aac122bd4f6e?=6ec8aac122bd4f6e,

6ec8aac122bd4f6e                       

6ec8aac122bd4f6e6ec8aac122bd4f6e                       設(shè)6ec8aac122bd4f6e6ec8aac122bd4f6e,                      ……(9分)

6ec8aac122bd4f6e,

∵二面角6ec8aac122bd4f6e小于6ec8aac122bd4f6e,                        …………………………(11分)

∴二面角6ec8aac122bd4f6e余弦值為6ec8aac122bd4f6e,

∴二面角B-PD-C大小為6ec8aac122bd4f6e。                          …………………………(12分)

 

20.(本題12分)

解:(Ⅰ) ∵6ec8aac122bd4f6e

6ec8aac122bd4f6e                           ………………………………(2分)

6ec8aac122bd4f6e在區(qū)間6ec8aac122bd4f6e上為減函數(shù)

6ec8aac122bd4f6e≤O在區(qū)間6ec8aac122bd4f6e上恒成立                       …………………………(3分)

6ec8aac122bd4f6e是開口向上的拋物線

6ec8aac122bd4f6e6ec8aac122bd4f6e        6ec8aac122bd4f6e6ec8aac122bd4f6e      6ec8aac122bd4f6e6ec8aac122bd4f6e

∴只需              即                               …………………………(5分)

        6ec8aac122bd4f6e6ec8aac122bd4f6e       6ec8aac122bd4f6e6ec8aac122bd4f6e

6ec8aac122bd4f6e6ec8aac122bd4f6e6ec8aac122bd4f6e                             ………………………………………(6分)

6ec8aac122bd4f6e6ec8aac122bd4f6e                                      

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

                                      

∴存在6ec8aac122bd4f6e,使得6ec8aac122bd4f6e

6ec8aac122bd4f6e在區(qū)間6ec8aac122bd4f6e內(nèi)有且只有一個(gè)極小值點(diǎn)                      ……………(8分)

6ec8aac122bd4f6e6ec8aac122bd4f6e                    

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

 

∴存在6ec8aac122bd4f6e,使得6ec8aac122bd4f6e

6ec8aac122bd4f6e在區(qū)間6ec8aac122bd4f6e內(nèi)有且只有一個(gè)極大值點(diǎn)                     ……………(10分)

當(dāng)6ec8aac122bd4f6e6ec8aac122bd4f6e6ec8aac122bd4f6e時(shí),由(Ⅰ)可知6ec8aac122bd4f6e在區(qū)間6ec8aac122bd4f6e上為減函數(shù)

6ec8aac122bd4f6e在區(qū)間6ec8aac122bd4f6e內(nèi)沒(méi)有極值點(diǎn).

綜上可知,當(dāng)6ec8aac122bd4f6e6ec8aac122bd4f6e時(shí),6ec8aac122bd4f6e在區(qū)間6ec8aac122bd4f6e內(nèi)的極值點(diǎn)個(gè)數(shù)為6ec8aac122bd4f6e

當(dāng)6ec8aac122bd4f6e6ec8aac122bd4f6e6ec8aac122bd4f6e時(shí),6ec8aac122bd4f6e在區(qū)間6ec8aac122bd4f6e內(nèi)的極值點(diǎn)個(gè)數(shù)為6ec8aac122bd4f6e          ………(12分)

 

21.(本題14分)

解:(Ⅰ)∵橢圓6ec8aac122bd4f6e中,6ec8aac122bd4f6e,                  ……………………………(1分)

6ec8aac122bd4f6e,                         ……………………………(2分)

∴橢圓6ec8aac122bd4f6e的標(biāo)準(zhǔn)方程為6ec8aac122bd4f6e。                  ……………………………(3分)

∵在拋物線6ec8aac122bd4f6e中,6ec8aac122bd4f6e,                           ……………………………(4分)

∴拋物線6ec8aac122bd4f6e的標(biāo)準(zhǔn)方程為:6ec8aac122bd4f6e。                     ………………………(5分)

 (Ⅱ)設(shè)直線

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