MIME-Version: 1.0 Content-Type: multipart/related; boundary="----=_NextPart_01C3A471.6BFDCA00" 此文档为“单个文件网页”,也称为“Web 档案”文件。如果您看到此消息,但是您的浏览器或编辑器不支持“Web 档案”文件。请下载支持“Web 档案”的浏览器,如 Microsoft Internet Explorer。 ------=_NextPart_01C3A471.6BFDCA00 Content-Location: file:///C:/A718D1D1/2003-1.htm Content-Transfer-Encoding: quoted-printable Content-Type: text/html; charset="us-ascii" 2000年试题分析、详解= 和评注

2003年考研数学(一)İ= 95;题评注

一、填空题(本题共6小题,每&#= 23567;题4分,满分24= . 把答案填在题中= 横线上)

1<= /b>  =3D .

分析 型未= 定式,化为指数函数= 5110;利用公式=3D进行= 计算求极限均可.

详解1 =3D,

=   <= /p>

原式=3D

详解2 因为=     <= /p>

所以    原式=3D

评注 本题属常规题型= ,完全类似例题见《= 5968;学复习指南》P.24-25 Ë= 63;1.30-31<= span lang=3DEN-US>.

2<= /b> 曲面与平= 面平行= 的切平面的方程是<= span lang=3DEN-US>.

分析 待求平面&#= 30340;法矢量为,因= 此只需确定切点坐标= 1363;可求出平面方程, 而切点坐&#= 26631;可根据曲面切平= 面的法矢量与平行= 确定.

详解 ,则=

<= span lang=3DEN-US> = .

设切点坐&#= 26631;为,则= 切平面的法矢量为 ,其= 与已知平面平行= ,因此有

        <= /p>

可解得   ,相= 应地有  

故所求的&#= 20999;平面方程为

    ,即= .

评注  本题属基本题型= ,完全类似例题见《= 5968;学复习指南》P.279 10.2= 8】和

《数学题&#= 22411;集粹和练习题集》P.112 Ë= 63;8.13<= span lang=3DEN-US>.

3 ,则= =3D   =   1      .

分析 = 展开= 为余弦级数,其= 系数计算公式为.

详解 根据余弦级数的= 定义,有

        

        =     =3D

        =     =3D

        =     =3D1.

评注  本题属基本题型= ,主要考查傅里叶级= 5968;的展开公式,本质ߍ= 8;转化为定积分的计算<= /span>. 完全类似&#= 20363;题见《文登数学全İ= 95;模拟试卷》数学一<= span lang=3DEN-US>P.62第一= 大题第(6)小题和&#= 12298;数学复习指南》P.240 Ë= 63;8.37<= span lang=3DEN-US>.

4<= /b>的基= 到基= 的过= 渡矩阵为   .

分析 n维向量空&#= 38388;中,从基到基= 的过= 渡矩阵P满足

[]=3D[]P,因= 此过渡矩阵P为:P=3D[[.

详解】根据&= #23450;义,从的基= 到基= 的过= 渡矩阵为

P=3D[= [.

 =3D

评注 本题属基本题型= ,完全类似例题见《= 5968;学复习指南》P.429 Ë= 63;3.35<= span lang=3DEN-US>.

5设二维随机变量(X,Y)的概= 率密度为

    

=  .

分析 已知二维随机变= 量(X,Y)的概= 率密度f(x,y),求= 满足一定条件的概率,一= 般可转化为二重积分=3D进行= 计算.

详解 由题设,有

 

        =       =3D

        =          y

 

        =     1

<= ![endif]>        =     

<= ![endif]>        =         D

 

<= ![endif]>        =      O     &nbs= p;      1        =    x

 

评注 本题属基本题型= ,但在计算二重积分= 6102;,应注意找出概率भ= 4;度不为零与满足不等&= #24335;的公= 共部分D,再在其&#= 19978;积分即可. 完全类似&#= 20363;题见《文登数学全İ= 95;模拟试卷》数学一<= span lang=3DEN-US>P.14第一= 大题第(5)小题.

6已知一批零件的长ò= 30;X (单位= :cm)服从= 正态分布,从= 中随机地抽取16个零件,&#= 24471;到长度的平均值为40 (cm),则= 的置= 信度为0.95的置= 信区间是 .

(<= /b>:标准正态分布= 函数值

分析 已知方差,对= 正态总体的数学期望进行= 估计,可根据,由= 确定= 临界值,进= 而确定相应的置信区= 8388;.

详解 由题设,,可= 见 于是= 查标准正态分布表知本题= n=3D16, , 因此= ,根据 ,有=

,即= ,故= 的置= 信度为0.95的置= 信区间是 .

评注 本题属基本题型= ,完全类似例题见《= 5968;学复习指南》P.608 Ë= 63;6.16<= span lang=3DEN-US>.

 

二、= 选择题(本题共6小题,每小题<= span lang=3DEN-US>4分,满分24= . 每小题给出的四= 个选项中,只有一项= 1526;合题目要求,把所๧= 3;项前的字母填在题后&= #30340;括号内)

1设函数f(x)<= span lang=3DEN-US>内连= 续,其导函数的图形= 2914;图所示,则f(x)<= /p>

(A)    一个极小值点和两È= 10;极大值点.   <= /p>

(B)    两个极小值点和一È= 10;极大值点.    

(C)    两个极小值点和两È= 10;极大值点.

      (D)  三个极小值点和一È= 10;极大值点.          =             &nb= sp;           [  C   ]

<= ![endif]>        =             &nb= sp;     y

 

 

 


<= ![endif]>        =           O        =          x

 

 分析 答案与极值点个= 数有关,而可能的极= 0540;点应是导数为零或ल= 8;数不存在的点,共4个,是极&#= 22823;值点还是极小值可Ű= 27;一步由取极值的第一= 或第二充分条件判定.

详解 根据导函数的图= 形可知,一阶导数为= 8646;的点有3个,而 x=3D0 则是= 导数不存在的点. 三个一阶&#= 23548;数为零的点左右两Ë= 91;导数符号不一致,必= 为极值点,且两个极= 3567;值点,一个极大值୅= 7;;在x=3D0左侧= 一阶导数为正,右侧= 9968;阶导数为负,可见x=3D0为极= 大值点,故f(x)共有= 两个极小值点和两个= 6497;大值点,应选(C).

评注 本题属新题型,= 类似考题2001年数= 学一、二中曾出现过= 5292;当时考查的是已知f(x)的图= 象去推导的图= 象,本题是其逆问题. 完全类似&#= 20363;题在文登学校经济ľ= 67;串讲班上介绍过.

2<= /b>均为= 非负数列,且,,,则必= 有

(A) <= sub>对任= 意n成立.        =     (B) 对任= 意n成立.

(C)  极限不存= 在.        =      (D) 极限不存= 在.    &nbs= p;  [  D  ]

分析 本题考查极限概= 念,极限值与数列前= 8754;有限项的大小无关ᦁ= 2;可立即排除(A),(B) = 而极限<= !--[if gte vml 1]> <= span lang=3DEN-US>型未= 定式,可能存在也可= 3021;不存在,举反例说਴= 6;即可;极限<= span lang=3DEN-US>型,= 必为无穷大量,即不= 3384;在.

详解 用举反例法,取= <= span lang=3DEN-US><= span lang=3DEN-US>,则= 可立即排除(A),(B),(C),因= 此正确选项为(D).

评注 对于不便直接证= 明的问题,经常可考= 4385;用反例,通过排除ૢ= 1;找到正确选项. 完全类似&#= 26041;法见《数学最后冲Ò= 50;》P.179.

3<= /b>已知函数f(x,y)在点(0,0)的某个邻域内连= 续,且,则=

(A)  (0,0)不是= f(x,y)的极= 值点.

(B)  (0,0)<= span lang=3DEN-US>f(x,y)的极= 大值点.

(C)  (0,0)<= span lang=3DEN-US>f(x,y)的极= 小值点.

(D)  根据所给条件无法Ò= 28;断点(0,0)是否= 为f(x,y)的极= 值点.        =       [  A  ]

分析 由题设,容易推= 知f(0,0)=3D0,因= 此点(0,0)是否= 为f(x,y)的极= 值,关键看在点(0,0)的充= 分小的邻域内f(x,y)是恒= 大于零、恒小于零还= 6159;变号.

详解 知,= 分子的极限必为零,= 0174;而有f(0,0)=3D0, <= /p>

 充分= 小时),于是

可见当y=3Dx<= span lang=3DEN-US>充分= 小时,<= /b>而当y=3D -x= 充分= 小时,. 故点= (0,0)不是= f(x,y)的极= 值点,应选(A).

评注 本题综合考查了= 多元函数的极限、连= 2493;和多元函数的极值ઍ= 0;念,题型比较新,有&= #19968;定难度. 将极限表&#= 31034;式转化为极限值加Ą= 80;穷小量,是有关极限= 分析过程中常用的思= 4819;,类似分析思想的ߴ= 3;题见《数学复习指南&= #12299;P.43 Ë= 63;1.71.

4设向量组I可由= 向量组II线性= 表示,则

   (A) 时,= 向量组II必线性相关.  (B) 时,= 向量组II必线性相关.

    (C) 时,= 向量组I必线性相关.   (D) 时,= 向量组I必线性相关.

        =             &nb= sp;                 =             &nb= sp;            =        [  D=   ]

分析 本题为一般教材= 上均有的比较两组向= 7327;个数的定理:若向ດ= 7;组I可由= 向量组II线性= 表示,则当时,= 向量组I必线性相关. 或其逆否&#= 21629;题:若向量组I可由= 向量组II线性= 表示,且向量组I线性无关,则必有. 可见= 正确选项为(D). 本题= 也可通过举反例用排= 8500;法找到答案.

详解 用排除法:如<= span lang=3DEN-US>,则= ,但= 线性= 无关,排除(A)<= span lang=3DEN-US>,则= 可由= 线性= 表示,但线性= 无关,排除(B)<= span lang=3DEN-US><= span lang=3DEN-US>可由= 线性= 表示,但线性= 无关,排除(C). 故正= 确选项为(D).

评注 本题将一已知定= 理改造成选择题,如= 6524;考生熟知此定理应෽= 3;可直接找到答案,若&= #35760;不清楚,也可通过= 500;造适当的反例找到正= ;确选项。此定理见《&#= 25968;学复习指南》P.409 定理= 11.

5设有齐次线性方程ń= 52;Ax=3D0<= span lang=3DEN-US>Bx=3D0, 其中= A,B均为= 矩阵= ,现有4个命题:

Ax=3D0的解= 均是Bx=3D0的解= ,则秩(A)<= span lang=3DEN-US>(B)<= /p>

若秩(A)<= span lang=3DEN-US>(B),则= Ax=3D0的解= 均是Bx=3D0的解= ;

Ax=3D0<= span lang=3DEN-US>Bx=3D0同解= ,则秩(A)=3D<= span lang=3DEN-US>(B)<= /p>

若秩(A)=3D<= span lang=3DEN-US>(B) = Ax=3D0Bx=3D0同解.

以上命题中正确= 的是

(A)  &nb= sp; .        =             &nb= sp; (B)    .

(C)  &nb= sp; .           =            (D= )    .        =            [  B  ]

分析 本题也可找反例= 用排除法进行分析,= 0294;&nb= sp; 两个命题的反例比ů= 39;复杂一些,关键是抓= 住 ,迅速排除不正= 确的选项.

详解 Ax=3D0Bx=3D0同解,则n-(A)=3Dn - (B), 即秩(A)=3D<= span style=3D'font-family:SimSun;mso-ascii-font-family:"Times New Roman";mso-han= si-font-family: "Times New Roman"'>秩(B),命题成立,可排除(A),(C);但= 反过来,若秩(A)=3D<= span lang=3DEN-US>(B) = 则不能推出Ax=3D0<= span lang=3DEN-US>Bx=3D0同解= ,如<= span lang=3DEN-US>,则= 秩(A)=3D<= span lang=3DEN-US>(B)=3D1,但= Ax=3D0<= span lang=3DEN-US>Bx=3D0不同= 解,可见命题不成立,排除(D),故正= 确选项为(B).

评注 文登学校数学辅= 导班上曾介绍过这样= 9968;个例题:

  齐次线性方程组Ax=3D0<= span lang=3DEN-US>Bx=3D0同解= 的充要条件

(A)  r(A)=3Dr(B).=           =             &nb= sp;   (B)  A,B为相似矩阵.

(C)  A, B<= span style=3D'font-family:SimSun;mso-ascii-font-family:"Times New Roman";mso-han= si-font-family: "Times New Roman"'>的行向量组等价= .        =        (D)  A,B的列向量组等价= .    &nbs= p;  [  C  ]

有此例题&#= 20026;基础,相信考生能Ű= 05;速找到答案.

6设随机变量,则=

 (A)  .        =      (B) .

 (C) .        =       (D) .        =             &nb= sp; [  C  ]

分析 先由分布= 的定义知,其= 中,再= 将其代入,然= 后利用F分布的定&#= 20041;即可.

详解 由题设知,,其= 中,于= 是

=3D,这= 里,根= 据F分布的定&#= 20041;知故应= 选(C).

评注 本题综合考查了= t分布、分布= 和F分布的概&#= 24565;,要求熟练掌握此Ç= 77;类常用统计量分布的= 定义, 见《文登&#= 25968;学全真模拟试卷》ă= 68;学一P.57第二= 大题第(6)小题(&#= 20107;实上完全相当于原Ɔ= 64;)和《数学复习指南= 》P.592的定= 义和P.595的【= 解题提示.

 

、(本题满分10分)=

过坐标原点作曲线y=3Dlnx的切= 线,该切线与曲线y=3Dlnx<= span lang=3DEN-US>x轴围成平&#= 38754;图形D.

(1)    D的面积A;

(2)    D绕直线x=3De<= /span>旋转一周所得旋= 转体的体积V.

分析 先求出切点坐标= 及切线方程,再用定= 1215;分求面积A; 旋转= 体体积可用一大立体= 5288;圆锥)体积减去一ऴ= 7;立体体积进行计算,&= #20026;了帮助理解,可画= 968;草图.

详解 (1)  设切点的横坐标= 为,则= 曲线y=3Dlnx在点= 处的= 切线方程是

           =       

由该切线过原点= 知 ,从= 而 所以= 该切线的方程为

        =         

平面图形D的面积

     = ; 

2 切线= <= span lang=3DEN-US>x轴及直线x=3De所围= 成的三角形绕直线x=3De旋转= 所得的圆锥体积为     = ;     

曲线y=3Dlnx= x轴及直线x=3De所围成的图形绕= 直线x=3De旋转= 所得的旋转体体积为

        <= /p>

因此所求&#= 26059;转体的体积为

        

 


        =             &nb= sp;   y

<= ![endif]>        =             1

 

 


<= ![endif]>        =             &nb= sp;      D

<= ![endif]>        =                O     1     e         x

 

评注 本题不是求绕坐= 标轴旋转的体积,因= 7492;不能直接套用现有ࠤ= 4;式. 也可考虑&#= 29992;微元法分析,完全ľ= 67;似例题见《数学复习= 指南》P.197的【= 7.34】和= P.201的【= 7.42<= span lang=3DEN-US>.

 

、(本题满分12分)=

将函数展开= 成x的幂级数&#= 65292;并求级数的和= .

分析 幂级数展开有直= 接法与间接法,一般= 2771;查间接法展开,即๩= 0;过适当的恒等变形、&= #27714;导或积分等,转化= 026;可利用已知幂级数展= ;开的情形。本题可先&#= 27714;导,再利用函数

的幂级数&#= 23637;开即可= ,然后取x为某特殊&#= 20540;,得所求级数的和.

详解 因为

= f(0)=3D, 所以=

=

     =3D

因为级数收敛= ,函数f(x)<= span lang=3DEN-US>处连= 续,所以

       

= ,得=

        ,

再由,得=

      

评注 完全类似例题见= 《数学复习指南》P.228的【= 8.25<= span lang=3DEN-US>.

 

、(本题满分10分)=

已知平面区域<= span lang=3DEN-US>L= D的正向边界. 试证:

(1) <= sub>;

(2) <= sub>

分析 本题边界曲线为= 折线段,可将曲线积= 0998;直接化为定积分证਴= 6;,或曲线为封闭正向&= #26354;线,自然可想到用= 684;林公式;(2)的证= 明应注意用(1)的结= 果.

详解 方法一

(1)  左边=3D

        =3D<= /p>

    右边=3D

        =3D<= /p>

所以    .

(2) <= /span>由于,故= 由(1)得

    

方法二:

1 根据格林公式,= 得

 

<= !--[if gte vml 1]> <= /p>

<= !--[if gte vml 1]> .

因为D 具有轮换&#= 23545;称性,所以

        =3D<= /p>

=   .

    (2) (1)

=

        =             =3D

        =             =3D (利= 用轮换对称性)

        =             &nb= sp;    =3D

评注 本题方法一与方= 法二中的定积分与二= 7325;积分是很难直接计౛= 9;出来的,因此期望通&= #36807;计算出结果去证明= 658;等式与不等式是困难= ;的. 另外,一&#= 20010;题由两部分构成时ʌ= 92;求证第二部分时应首= 先想到利用第一部分= 0340;结果,事实上,第ߌ= 8;部分往往是起桥梁作&= #29992;的.

本题完全类似例题Š= 65;《数学复习指南》<= span lang=3DEN-US>P.325的【= 12.15<= span lang=3DEN-US>, 相当于此&#= 20363;题中取,也= 就是说,本题是【例= 12.15】的= 特殊情形.

=  

、(本题满分10分)=

某建筑工程打地基ą= 02;,需用汽锤将桩打进= 土层. 汽锤每次&#= 20987;打,都将克服土层ë= 45;桩的阻力而作功. 设土层对&#= 26729;的阻力的大小与桩ŝ= 87;打进地下的深度成正= 比(比例系数为k,k>0<= span lang=3DEN-US>.汽锤第一&#= 27425;击打将桩打进地下a m. 根据= 设计方案,要求汽锤= 7599;次击打桩时所作的ࡃ= 1;与前一次击打时所作&= #30340;功之比为常数r(0<r<1). <= /p>

(1) <= /span>汽锤击打桩3次后,可&#= 23558;桩打进地下多深?

(2) <= /span>若击打次数不限= ,汽锤至多能将桩打= 6827;地下多深?

m表示长度&#= 21333;位米.

分析 本题属变力做功= 问题,可用定积分进= 4892;计算,而击打次数ߎ= 1;限,相当于求数列的&= #26497;限.

详解 (1) 设第= n次击打后&#= 65292;桩被打进地下,第= n次击打时&#= 65292;汽锤所作的功为. 由题= 设,当桩被打进地下= 0340;深度为x时,土层&#= 23545;桩的阻力的大小为,所= 以

    <= /p>

   

可得=

     

=     

       

可得=

    <= /p>

从而    <= /p>

即汽锤击&#= 25171;3次后,可&#= 23558;桩打进地下.

2 由归纳法,设<= span lang=3DEN-US>,则=

        =       =3D

由于,故= 得

        ,

从而   

于是    <= /p>

即若击打&#= 27425;数不限,汽锤至多Ŋ= 21;将桩打进地下 m.

评注 本题巧妙地将变= 力作功与数列极限两= 0010;知识点综合起来了ᦁ= 2;有一定难度。但用定&= #31215;分求变力做功并不= 159;什么新问题,何况本= ;题的变力十分简单,&#= 21464;力更复杂的情形可Ö= 42;见《数学复习指南》= P.202的【= 7.44-45<= span lang=3DEN-US>.

 

、(本题满分12分)=

设函数y=3Dy(= x)内具= 有二阶导数,且<= span lang=3DEN-US>y=3Dy(x)的反= 函数.

(1)  试将x=3Dx(y)所满足的微分方= 程变换= 为y=3Dy(x)满足= 的微分方程;

(2) 求变= 换后的微分方程满足= 1021;始条件的解= .

分析 转化= 为比较= 简单,=3D,关= 键是应注意:

=3D

     =3D.

然后再代&#= 20837;原方程化简即可.

详解 (1) 由反= 函数的求导公式知 ,于= 是有

=3D=3D.

代入原微&#= 20998;方程得

                 =             &nb= sp;            =           (  *  )

(2) <= /span>方程( * )所对应的齐次方= 程的通= 解为

        =  

设方程( * )的特解为

     = ;  <= /p>

代入方程( * ),求得,故= ,从= 而的通= 解是

        =  

,得= . 故所= 求初值问题的解为

     

评注 本题的核心是第= 一步方程变换,完全= 1867;似例题见《数学复ߖ= 4;指南》P.53的【= 2.8<= span lang=3DEN-US>.

 

、(本题满分12分)=

设函数f(x)连续且恒大于零= ,

   <= span lang=3DEN-US><= /p>

其中<= span lang=3DEN-US>

(1) <= /span>讨论F(t)在区间<= !--[if gte vml 1]> 内的= 单调性.

(2) <= /span>证明当t>0= 时,

分析 (1) 先分= 别在球面坐标下计算= 0998;子的三重积分和在ਖ਼= 7;坐标下计算分母的重&= #31215;分,再根据导函数的符= 号确定单调性;(2) 将待= 证的不等式作适当的= 4658;等变形后,构造辅ࡄ= 1;函数,再用单调性进&= #34892;证明即可.

详解 (1)  因为

     <= /p>

    <= /p>

所以在<= span lang=3DEN-US>,故= F(t) <= span lang=3DEN-US>内单= 调增加.

2

        <= /p>

要证明t>0<= span lang=3DEN-US>,只= 需证明t>0时,= ,即=

        

=     <= /p>

=     ,故= g(t)<= span lang=3DEN-US>内单= 调增加.

因为g(t)<= span lang=3DEN-US>t=3D0处连= 续,所以当t>0时,= 有g(t)>g(0).

g(0)=3D0, 故当= t>0时,= g(t)>0,

因此,当t>0时,=

评注 本题将定积分、= 二重积分和三重积分= 1561;多个知识点结合起੖= 9;了,但难点是证明(<= /span>2)中的不&#= 31561;式,事实上,这里È= 63;可用柯西积分不等式= 证明:

         <= /p>

在上式中&#= 21462;f(x)<= span lang=3DEN-US><= span lang=3DEN-US>g(x)<= span lang=3DEN-US>即可= .

 完全类似例题见= 《数学题型集粹与练= 0064;题集》P.129Ë= 63;9.21】、= 【9.24】和= 《数学复习指南》P.305的【= 11.26<= span lang=3DEN-US>.

 

、(本题满分10分)=

设矩阵<= span lang=3DEN-US><= span lang=3DEN-US>,求= B+2E的特= 征值与特征向量,其= 0013;<= span lang=3DEN-US>A的伴随矩&#= 38453;,E= 3阶单位矩阵.

分析 可先求出,进= 而确定<= span lang=3DEN-US>B+2E,再= 按通常方法确定其特= 4449;值和特征向量;或ࠠ= 8;求出A的特征值&#= 19982;特征向量,再相应ß= 20;确定A*的特征值&#= 19982;特征向量,最终根þ= 54;B+2E<= span lang=3DEN-US>A*+2E相似= 求出其特征值与特征= 1521;量.

详解 方法一:

经计算可得

        = <= /p>

        =3D.

从而

        <= /p>

<= /p>

= B+2E的特征值为

时,= 解,得= 线性无关的特征向量= 0026;

       =

所以属于&#= 29305;征值的所= 有特征向量为

        ,其= 中是不= 全为零的任意常数.

时,= 解,得= 线性无关的特征向量= 0026;

    <= /p>

所以属于&#= 29305;征值的所= 有特征向量为,其= 中为任= 意常数.

方法二:设A的特征值&#= 20026;,对= 应特征向量为,即= . 由于= ,所= 以

 又因 ,故= 有

于是有   <= /p>

        

因此,<= span lang=3DEN-US>B+2E的特= 征值,对应的特征向= 7327;为

由于 <= /p>

= A的特征值为

时,= 对应的线性无关特征= 1521;量可取为<= span lang=3DEN-US> 

时,= 对应的一个特征向量= 0026;

,得= <= span lang=3DEN-US><= span lang=3DEN-US>.

因此,B+2E的三= 个特征值分别为9= 93.

对应于特征值9的全部特&#= 24449;向量为

    ,其= 中是不= 全为零的任意常数;

对应于特征值3的全部特&#= 24449;向量为

    ,其= 中是不= 为零的任意常数.

评注 ,若= <= span lang=3DEN-US>A的特征值&#= 65292;对应特征向量为,则= B= A有相同的特征值= ,但对应特征向量不= 1516;,B对应特征&#= 20540;的特= 征向量为

本题计算量大,= 但方法思路都是常规= 1644;熟悉的,主要是考੣= 7;考生的计算能力。不&= #36807;利用相似矩阵有相= 516;的特征值以及A= A*的特征值之间的= 关系讨论,可适当降= 0302;计算量,这方面可ࡠ= 2;见类似例题《考研数&= #23398;大串讲》P.214Ë= 63;5】,= 《数学最后冲刺》P.136Ë= 63;3<= span lang=3DEN-US>.

=  

、(本题满分8分)=

已知平面上三条不×= 16;直线的方程分别为<= /p>

        = <= /p>

        = <= /p>

        = .

试证这三&#= 26465;直线交于一点的充Ñ= 98;必要条件为

分析 三条直线相交于= 一点,相当于对应线= 4615;方程组有唯一解,๢= 7;而转化为系数矩阵与&= #22686;广矩阵的秩均为2.

详解 方法一:必要性

设三条直线交于= 一点,则线性方程组

        =             &nb= sp;       (*)

有唯= 9968;解,故系数矩阵与增广矩阵的秩均为2,于是=

由于

        =3D,

但根= 5454;题设 ,故

        =     

充分性:由,则从必要性的&= #35777;明可知,,故秩

由于

       

        =        =3D

故秩(A)=3D2. 于是,

        =    秩(A)=3D秩=3D2.

    因此ਬ= 1;程组(*)= 377;唯一解,即三直线= 交于= 一点.<= /o:p>

方法二:必要性

设三直线交于一= 点,则= <= span lang=3DEN-US>Ax=3D0的非= 零解,其中

       

于是  .

        

        =3D,

但根= 5454;题设 ,故

        =     

充分性:考虑线性= 方程组

                 =             &nb= sp;       (*)

将方= 1243;组(*)= 340;三个方程相加,并由= ;a+b+c=3D0可知,方程组(*)= 561;价于方程组

        =              =             &nb= sp;       (* *)

因为 

        =        =3D-,

故方= 1243;组(* *)&#= 26377;唯一解,所以方程ń= 52;(*)= 377;唯一解,即三直线= 交于= 一点.<= /o:p>

评注】本题&= #23558;三条直线的位置关= 995;转化为方程组的解的= ;判定,而解的判定问&#= 39064;又可转化为矩阵的ĸ= 09;计算,进而转化为行= 列式的计算,综合考= 6597;了多个知识点.

完全类似例题见= 《数学最后冲刺》P.196Ë= 63;5<= span lang=3DEN-US>.

 

十一 、(本题满分10分)=

已知甲、乙两箱= 中装有同种产品,其= 0013;甲箱中装有3件合格品&#= 21644;3件次品,&#= 20057;箱中仅装有3件合格品. 从甲箱中&#= 20219;取3件产品放&#= 20837;乙箱后,求:

(1) 乙箱= 中次品件数的数学期= 6395;;

(2) 从乙= 箱中任取一件产品是= 7425;品的概率.

分析 乙箱中可能的次= 品件数为0= 123,分别求出其概= 率,再按定义求数学= 6399;望即可;而求从乙౞= 5;中任取一件产品是次&= #21697;的概率,涉及到两= 425;试验,是典型的用全= ;概率公式的情形,第&#= 19968;次试验的各种可能ń= 67;果(取到的次品数)= 就是要找的完备事件= 2452;.

详解 (1) X的可= 能取值为0= 123X的概率分布为<= /p>

         <= span lang=3DEN-US> k=3D0,1,2,3.

        =     X     &nbs= p; 0     &nbs= p; 1        2        3

        =       P     &nbs= p;           =      

因此

        

(2) 设A表示事件&= #8220;从乙箱中任取一件= 产品是次品”,由于<= span lang=3DEN-US><= span lang=3DEN-US><= span lang=3DEN-US>构成= 完备事件组,因此根= 5454;全概率公式,有

  &= nbsp;

         =3D

         =3D

评注】本题&= #23545;数学期望的计算也= 487;用分解法:

 

       

= 的概= 率分布为

              0       1

<= ![endif]>     P                       =     

 因为,所= 以

    

完全类似例题见= 《考研数学大串讲》P.256Ë= 63;20】,= 利用分解法求数字特= 4449;的思想见《数学题ࣁ= 1;集粹与练习题集》P.280Ë= 63;3.18-21<= span lang=3DEN-US>.

 

十二 、(本题满分8分)=

设总体X的概率密度为<= /p>

       

其中是未= 知参数. 从总体X中抽取简&#= 21333;随机样本,记=

(1)    求总体X的分布函数F(x);

(2)    求统计量的分= 布函数<= /p>

(3)    如果用<= !--[if gte vml 1]> 作为= 的估= 计量,讨论它是否具= 6377;无偏性.

分析 求分布函数F(x)是基= 本题型;求统计量的分= 布函数,可= 作为多维相互独立且= 1516;分布的随机变量函ਤ= 8;求分布函数,直接用&= #23450;义即可;是否具有= 080;偏性,只需检验是否= 成立.

详解 (1)

 

(2) 

        =3D

        =3D

        =3D

        =3D

(3) <= sub>概率= 密度为

      

因为  

        =    =3D<= /p>

所以作为= 的估= 计量不具有无偏性.

评注】本题&= #34920;面上是一数理统计&= 382;题,实际上考查了求= ;分布函数、随机变量&#= 30340;函数求分布和概率ê= 94;度以及数学期望的计= 算等多个知识点. 将数理统&#= 35745;的概念与随机变量ĕ= 14;分布与数字特征结合= 起来是一种典型的命= 9064;形式.

完全类似例题见= 《文登数学全真模拟= 5797;卷》试卷(七)第ࡓ= 3;二题(从题型到求解&= #26041;法完全一致),《数学题&#= 22411;集粹与练习题集》P.292Ë= 63;5.8<= span lang=3DEN-US>,在文登学&#= 26657;辅导班上也介绍过Ñ= 60;乎完全一致的例题(= 参加过辅导班的同学= 1487;查看笔记).

 

注&#= 65306; 1.《数学复习指南= 2299; (2003版,理工类)世&= #30028;图书出版公司

主编: = 陈文灯、黄先开<= /span>

2.《数学题= 2411;集粹与练习题集》ᦀ= 8;2003版,理工类)世界Þ= 70;书出版公司

主编: = 陈文灯、黄先开<= /span>

3.《文登数= 3398;全真模拟试卷》(2003&#= 29256;,理工类)世界图È= 70;出版公司

主编: = 陈文灯、黄先开<= /span>

4.《数学最= 1518;冲刺》(2003版,理工&#= 31867;)世界图书出版公Ö= 96;

主编: = 陈文灯、黄先开<= /span>

5.《考ం= 0;数学大串讲》(2002版ʌ= 92;理工类)世界图书出= 版公司

主编: = 黄先开、曹显兵、施= 6126;存

 

(文登学校= 379;稿)

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