5、矩阵 INCLUDEPICTURE ＼d "https://p.ananas.chaoxing.com/star3/origin/c26b036e12bc370ccac4c6ddc452f430.png" ＼* MERGEFORMATINET ,则 INCLUDEPICTURE ＼d "https://p.ananas.chaoxing.com/star3/origin/e17a3b2ad5a6d579639f5df659fad89a.png" ＼* MERGEFORMATINET
( )

6
第7空:

1/2

13、下列说法中错误的是( )
(1.0)

A. 　 反射变换,伸压变换,切变都是初等变换

B. 　 若M,N互为逆矩阵,则MN=E

C. 　 任何矩阵都有逆矩阵

D. 　 反射变换矩阵都是自己的逆矩阵

19、随机选取一个不超过100的正整数,能够被5或7整除的概率是_________.( )
( )

28、设 INCLUDEPICTURE ＼d "https://p.ananas.chaoxing.com/star3/origin/03dc2fa866de121c60079e7c3c0c1ec8.png" ＼* MERGEFORMATINET 为齐次线性方程组 INCLUDEPICTURE ＼d "http://mooc1-2.chaoxing.com/ananas/latex/p/181683" ＼* MERGEFORMATINET 的解, INCLUDEPICTURE ＼d "https://p.ananas.chaoxing.com/star3/origin/0ec1c289289586c124842686f7b692a5.png" ＼* MERGEFORMATINET 为非齐次线性方程组 INCLUDEPICTURE ＼d "http://mooc1-2.chaoxing.com/ananas/latex/p/23856" ＼* MERGEFORMATINET 的解,则( )
(1.0)

A. 　 INCLUDEPICTURE ＼d "https://p.ananas.chaoxing.com/star3/origin/25940044c519ca9424762cf1dcd641f4.png" ＼* MERGEFORMATINET

B. 　 INCLUDEPICTURE ＼d "https://p.ananas.chaoxing.com/star3/origin/c851e62c6efb84346fa3b8eb559eb305.png" ＼* MERGEFORMATINET

C. 　 INCLUDEPICTURE ＼d "https://p.ananas.chaoxing.com/star3/origin/c7da3295dfca86efa5d5a91715d20ee8.png" ＼* MERGEFORMATINET

D. 　 INCLUDEPICTURE ＼d "https://p.ananas.chaoxing.com/star3/origin/6edb0e5171891a2cea8111d1d377d535.png" ＼* MERGEFORMATINET

55、下列说法正确的是( )
(1.0)

A. 　 相似矩阵必有相同的特征值

B. 　 相似矩阵必有相同的特征向量

C. 　 矩阵A的两个特征向量之和仍是A的特征向量

D. 　 上三角矩阵A的特征值正好是矩阵A中主对角线的非零元素

80、在一个不透明的袋子中装有4个除颜色外完全相同的小球,其中白球1个,黄球1个,红球2个,摸出一个球不放回,再摸出一个球,两次都摸到红球的概率是( )
(1.0)

A. 　 1/2

B. 　 1/3

C. 　 1/4

D. 　 1/6

34、设A是 INCLUDEPICTURE ＼d "http://mooc1-2.chaoxing.com/ananas/latex/p/111984" ＼* MERGEFORMATINET 矩阵,如果 INCLUDEPICTURE ＼d "http://mooc1-2.chaoxing.com/ananas/latex/p/312248" ＼* MERGEFORMATINET ,则( )
(1.0)

A. 　 INCLUDEPICTURE ＼d "https://p.ananas.chaoxing.com/star3/origin/22036fe43827ed0db23d177e31c3a2b4.png" ＼* MERGEFORMATINET

B. 　 INCLUDEPICTURE ＼d "https://p.ananas.chaoxing.com/star3/origin/b2438085c7f52fc89bd82d931934be3d.png" ＼* MERGEFORMATINET

C. 　 INCLUDEPICTURE ＼d "https://p.ananas.chaoxing.com/star3/origin/5bfacced11915d1e48dda63d54b5fc24.png" ＼* MERGEFORMATINET

D. 　 INCLUDEPICTURE ＼d "https://p.ananas.chaoxing.com/star3/origin/33a779319651bcd1abbd76889f388a9f.png" ＼* MERGEFORMATINET

19、下面不是普通坐标(2,3)的齐次坐标的是( )
(1.0)

A. 　 (2,3,1)

B. 　 (-2,-3,1)

C. 　 (-2,-3,-1)

D. 　 (4,6,2)

3、数学递归式 INCLUDEPICTURE ＼d "http://mooc1-api.chaoxing.com/ananas/latex/p/809703" ＼* MERGEFORMATINET 表示下列哪个关系
(1.0)

A. 　 前n个奇数之和

B. 　 前n个偶数之和

C. 　 前n个正整数之和

D. 　 n的阶乘