题目内容

设A与B是n阶可逆矩阵,则()。

A+B是可逆矩阵
B. A+B是不可逆矩阵
C. AB是可逆矩阵
D. AB是不可逆矩阵

查看答案
更多问题

The History of Eldertree CosmeticsEarly days1. The company was established in ______ by Olivia Jenkins.2. Her products sold well because of the ______ of natural products.3. In order to satisfy demand, the owners had to find ______ in 1977. The 1980s4. The introduction of new products resulted in the ______ of the business.5. By recruiting professional expertise, the company managed to secure ______ with major UK retailers.6. To support further growth, Eldertree needed both of a bigger ______ company.7. In 1987 the company was acquired by Greenaway, the UK’s largest ______.8. To improve productivity, Greenaway decided to build a ______ in 1988.9. Greenaway also decided to keep Eldertree’s ______ for its products.EIdertree Cosmetics today10. Greenaway has centralised functions such as its ______.11. In spite of its increased size, the company has kept a ______.12. In the last decade Eldertree has become a ______ both at home and abroad. 5()

The History of Eldertree CosmeticsEarly days1. The company was established in ______ by Olivia Jenkins.2. Her products sold well because of the ______ of natural products.3. In order to satisfy demand, the owners had to find ______ in 1977. The 1980s4. The introduction of new products resulted in the ______ of the business.5. By recruiting professional expertise, the company managed to secure ______ with major UK retailers.6. To support further growth, Eldertree needed both of a bigger ______ company.7. In 1987 the company was acquired by Greenaway, the UK’s largest ______.8. To improve productivity, Greenaway decided to build a ______ in 1988.9. Greenaway also decided to keep Eldertree’s ______ for its products.EIdertree Cosmetics today10. Greenaway has centralised functions such as its ______.11. In spite of its increased size, the company has kept a ______.12. In the last decade Eldertree has become a ______ both at home and abroad. 4()

The History of Eldertree CosmeticsEarly days1. The company was established in ______ by Olivia Jenkins.2. Her products sold well because of the ______ of natural products.3. In order to satisfy demand, the owners had to find ______ in 1977. The 1980s4. The introduction of new products resulted in the ______ of the business.5. By recruiting professional expertise, the company managed to secure ______ with major UK retailers.6. To support further growth, Eldertree needed both of a bigger ______ company.7. In 1987 the company was acquired by Greenaway, the UK’s largest ______.8. To improve productivity, Greenaway decided to build a ______ in 1988.9. Greenaway also decided to keep Eldertree’s ______ for its products.EIdertree Cosmetics today10. Greenaway has centralised functions such as its ______.11. In spite of its increased size, the company has kept a ______.12. In the last decade Eldertree has become a ______ both at home and abroad. 3()

已知α1,α2,β1,β2是3维列向量,设A=[α1,α2,β1],B=[α1,α2,β2],则|A+B|+|2A-5B|等于()。

A. 3|A|-4|B|
B. 9|A|-74|B|
C. 22|A|-41|B|
D. 3|A|-4|B

答案查题题库