刹犊寄每缸峨疯尚粒陕趟庙畴
对应课程:点击查看
起止时间:2021-03-01到2021-06-30
更新状态:每5天更新一次
Chapter 1 Systems of Linear Equations unit test 1
1、 
A:
B:
C:
D:
答案:
2、
In the following matrices, ( ) is not elementary matrices.
A:
B:
C:
D:
答案:
3、 
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 interchang-
ing the first and second columns.
D:
the elementary column operation of interchang-
ing the second and third columns.
答案:
the elementary row operation of interchanging
the second and third rows.
4、 If A is nonsingular, then A can be factored into a product of elementary matrices.
A:正确
B:错误
答案: 正确
5、
If A is a 3×3 matrix and a1 +2a2 −a3 = 0, then A must be singular.
A:正确
B:错误
答案: 正确
6、
If A and B are n×n matrices, then (A−B)2 =A2−2AB+B2.
A:正确
B:错误
答案: 正确
7、
Use back substitution to solve the following systems
of equations:
<img src="http://edu-image.nosdn.127.net/3C4C3AE6C1AB2BC14E8AAF46F9DEF525.jpg?imageView&thumbnail=890x0&quality=100" />
答案: 4, 1, 3
8、 
答案: -2/3
9、 
答案: 5 -10 15
5 -1 4
8 -9 6
10、 
答案: 1 2 -3
-1 1 -1
0 -2 3
Chapter 2 Determinants unit test 2
1、 
A:1.
B:6.
C:-6.
D:0.
答案: -6.
2、
Let A be a n×n matrix, then ( ).
A:
AAT =ATA.
B:
det(AAT ) = det(AT A).
C:
if det(A) = 0, then A is invertible.
D:
if det(A) = 0, then AT is invertible.
答案:
det(AAT ) = det(AT A).</span>
3、 
A:
B:
C:
D:
答案:
4、
det(A+B)=det(A)+det(B).
A:正确
B:错误
答案: 错误
5、
A triangular matrix is nonsingular if and only if its
diagonal entries are all nonzero.
A:正确
B:错误
答案: 正确
6、
If A and B are row equivalent matrices, then their
determinants are equal.
A:正确
B:错误
答案: 错误
7、 
答案: -8 8
8、 
答案: -1 6
9、
Let A and B be 3×3 matrices with det(A) = 4 and det(B) = 5. Find the value of det (A−1 B) = .
如需购买完整答案，请点击下方红字：
获取更多中国大学慕课答案，请点击这里，进入mooc.mengmianren.com
轨藏旁疾博类芍薯葛醋苔方湿