大一线性代数练习题五套(带答案)(7)

1 a

05G n( 3) A a ... a a a a n 1, a. ......... aa...1 aa...1a...a1...

05H A 4 ,A* A , r[(A*)*].

05I A n ,B n m ,r(B) n AB O, :A O.05J

A BC.

05K

0111 1011 A ,1 10 1 1 1 10

** AXA 3XA 12E, E 4 ,A A , A n , B C( C2 C), X.

05L A

1/201 01/20*A 001/2

0000 2 , 0 1

1 1 X 3AXA XA 2E, E 4 . X.

05M

1 1A 0 0 0 0 ,2 0 10 230000

1* 1 1 B [(A)]BA 2AB 12E, E 4 . B.2

.17.