1、工程数学(本)期末复习指导(文本)工程数学(本)综合练习一、单项选择题1设 均为 阶可逆矩阵,则下列等式成立的是( ) BA,nA B111BAC D11 11正确答案:A2方程组 相容的充分必要条件是( ),其中 , 31221ax 0ia)3,21(iA B032a321aC D 1 0正确答案:B3设矩阵 的特征值为 0,2,则 3A 的特征值为 ( ) 1AA0,2 B0,6 C0,0 D2,6正确答案:B 4. 设 A, B 是两事件,则下列等式中( )是不正确的A. ,其中 A, B 相互独立)()(PB. ,其中 0)(C. ,其中 A, B 互不相容)()(ABD. ,其中P)
2、(正确答案:C5若随机变量 X 与 Y 相互独立,则方差 =( ) )32(YXDA B)(3(2D(C D 94 )94正确答案:D6设 A 是 矩阵, 是 矩阵,且 有意义,则 是( )矩阵nmBtsBCAA B C Dsmt正确答案:B7若 X1、 X2是线性方程组 AX=B 的解,而 是方程组 AX = O 的解,则( )是 AX=B 的解21、A B C D 3321X21X正确答案:A8设矩阵 ,则 A 的对应于特征值 的一个特征向量 =( ) 210A B C D 1001正确答案:C9. 下列事件运算关系正确的是( ) A B C DABAABB1正确答案:A 10若随机变量
3、,则随机变量 ( ) )1,0(NX23XYA B C D)3,2(3,4),4(N)3,2(N正确答案:D11设 是来自正态总体 的样本,则( )是 的无偏估计321,x),(2A B 5321xC D321xx 5正确答案:C12对给定的正态总体 的一个样本 , 未知,求 的置信区间,选用的样本函数服从),(2N),(21nx 2( ) A 分布 B t 分布 C指数分布 D正态分布2正确答案:B二、填空题1 设 ,则 的根是 应该填写:4122)(xf 0)(xf 2,12 设向量 可由向量组 线性表示,则表示方法唯一的充分必要条件是 n,2 n,21应该填写:线性无关3 若事件 A,
4、B 满足 ,则 P( A - B)= 应该填写: )(BPA4 设随机变量的概率密度函数为 ,则常数 k = 应该填写:其 它,011)(2xkxf 45 若样本 来自总体 ,且 ,则 ,应该填写:nx,21 ),(NXnix1)1,0(nN6行列式 的元素 的代数余子式 的值为= 应该填写-56701568321a21A7设三阶矩阵 的行列式 ,则 = 应该填写:2A18若向量组: , , ,能构成 R3一个基,则数 k 213020k应该填写: 9设 4 元线性方程组 AX=B 有解且 r( A)=1,那么 AX=B 的相应齐次方程组的基础解系含有个解向量应该填写:310设 互不相容,且
5、,则 应该填写:0 A,P()0()11若随机变量 X ,则 应该填写:2,UXD3112设 是未知参数 的一个估计,且满足 ,则 称为 的 估计 )(E应该填写:无偏三、计算题1设矩阵 ,求:(1) ;(2) 203,1032BAAB1解:(1)因为 1210213B所以 A(2)因为 100132IA12/31013所以 02/1A2求齐次线性方程组 的通解02359625214xx解: A= 360103159121一般解为 ,其中 x2, x4 是自由元 035421x令 x2 = 1, x4 = 0,得 X1 = ;)0,(x2 = 0, x4 = 3,得 X2 = 3所以原方程组的
6、一个基础解系为 X1, X2 原方程组的通解为: ,其中 k1, k2 是任意常数 k3设随机变量 (1)求 ;(2)若 ,求 k 的值 (已知),4(N)4(P932.0)(kXP) 93.0)583.0,975.0)2( 解:(1) 1)2(XP(X= 1 1( ))4)2(= 2(1 )0.045 )((2) )4()(kXPk1 1 )5.1(932.0)(k(5)4(k即 k4 = -1.5, k2.5 4某切割机在正常工作时,切割的每段金属棒长服从正态分布,且其平均长度为 10.5 cm,标准差为 0.15cm.从一批产品中随机地抽取 4 段进行测量,测得的结果如下:(单位:cm)
7、10.4,10.6,10.1,10.4问:该机工作是否正常( , )?05.96.17.u解:零假设 .由于已知 ,故选取样本函数1:0H50 nxU),(N经计算得 , ,375.10x075.41.6.1075.3nx由已知条件 ,且 96.12u 219x故接受零假设,即该机工作正常. 5已知矩阵方程 ,其中 , ,求 BAX30135021BX解:因为 ,且I)( 102100211)(IA10即 102)(1AI所以 342150)(1BIX6设向量组 , , , ,求),42(1,),1684(2,)2,51(,)1,3(4,这个向量组的秩以及它的一个极大线性无关组解:因为( )=
8、1234 12156310750024所以, r( ) = 3 4321,它的一个极大线性无关组是 (或 ) 41,432,7设齐次线性方程组 , 为何值时方程组有非零解?在有非零解时,求出通解08352321xx解:因为 A = 83561023501时, ,所以方程组有非零解 05即当 )(r方程组的一般解为: ,其中 为自由元321x3令 =1 得 X1= ,则方程组的基础解系为 X13x),(通解为 k1X1,其中 k1为任意常数 8罐中有 12 颗围棋子,其中 8 颗白子,4 颗黑子若从中任取 3 颗,求:(1)取到 3 颗棋子中至少有一颗黑子的概率;(2)取到 3 颗棋子颜色相同的
9、概率解:设 =“取到 3 颗棋子中至少有一颗黑子” , =“取到的都是白子” , =“取到的都是黑子” , B =“取到 3 颗1A2A3A棋子颜色相同” ,则(1) )(1)()(21APAP745.02.1328C(2) = )()() 3232B 273.0185.031249设随机变量 X N(3,4) 求:(1) P(1 X 7) ;(2)使 P( X a)=0.9 成立的常数 a (, , ) 81.0)(9.0).(9.)(解:(1) P(1 X 7)= 232= = )3()1(= 0.9973 + 0.8413 1 = 0.8386 (2)因为 P( X a)= = = 0.
10、9)2(a)3(所以 , a = 3 + = 5.56 8.13a8.10从正态总体 N( ,9)中抽取容量为 64 的样本,计算样本均值得 = 21,求 的置信度为 95%的置信区x间(已知 )6.975.0u解:已知 , n = 64,且 3nxu)1,0(N因为 = 21, ,且 x96.12 735.649.21所以,置信度为 95%的 的置信区间为:.1,5.0,2121nuxnux四、证明题1设 是 n 阶矩阵,若 = 0,则 A32)(AII证明:因为 = = = )(2AI3II所以 1(I2设 n 阶矩阵 A 满足 ,则 A 为可逆矩阵0)(I证明: 因为 ,即 )(2I I
11、2所以, A 为可逆矩阵 3设向量组 线性无关,令 , , ,证明向量组321,2132134线性无关。321,证明:设 ,即0321kk0)4()2()( 1332 k2131kk因为 线性无关,所以 321,042321k解得 k1=0, k2=0, k3=0,从而 线性无关 31,4设 , 为随机事件,试证:ABPABPA()()证明:由事件的关系可知 UBAB()而 ,故由概率的性质可知 ()()内部资料,请勿外传!#XuyUP2kNXpRWXmA&UE9aQGn8xp$R#͑GxGjqv$UE9wEwZ#QcUE%&qYpEh5pDx2zVkum&gTXRm6X4NGpP$v
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