MOOC Linear Algebra(西北工业大学)1207119809 最新慕课完整章节测试答案
Chapter 1 Systems of Linear Equations
文章目录
unit test 1
1、单选题：
选项：
A: 
B: 
C: 
D: 
答案: 【 】
2、单选题：
In the following matrices, ( ) is not elementary matrix.
选项：
A: 
B: 
C: 
D: 
答案: 【 】
3、单选题：
选项：
A:
the elementary row operation of interchanging
the first and second rows.
B:
the elementary row operation of interchanging
the second and third rows.
C:
the elementary column operation of interchanging the first and second columns.
D:
the elementary column operation of interchanging the second and third columns.
答案: 【
the elementary row operation of interchanging
the second and third rows.
】
4、判断题：
If 
is nonsingular, then can be factored into a
product of elementary matrices.
选项：
A: 正确
B: 错误
答案: 【 正确】
5、判断题：
If A is a 3×3 matrix and a1 +2a2 −a3 = 0, then A must be singular.
选项：
A: 正确
B: 错误
答案: 【 正确】
6、判断题：
If A and B are n×n matrices, then (A-B)2 = A2 −2AB+B2.
选项：
A: 正确
B: 错误
答案: 【 正确】
7、填空题：
Use back substitution to solve the following systems
of equations:
答案: 【 4,1,3】
8、填空题：
答案: 【 - 2/3】
9、填空题：
答案: 【 5 -10 15
5 -1 4
8 -9 6】
10、填空题：
答案: 【 1 2 -3
-1 1 -1
0 -2 3】
Chapter 2 Determinants
unit test 2
1、单选题：
选项：
A: 1
B: 6
C: -6
D: 0
答案: 【 -6】
2、单选题：
Let A be a n×n matrix, then ( )
选项：
A: 
B: 
C: If 
, then 
is in