矩阵的题,能帮做出个答案么?括号外面是-1次幂
问题描述:
矩阵的题,能帮做出个答案么?括号外面是-1次幂
1 5 -1
( )
2 -3
答
lAl=-13,A可逆
(A l I)=(1 5 l 1 0 )-L ( 1 5 l1 0)-L(1 5 l1 0 )
(2 -3 l 0 1 ) ( 0 -13 l2 1) ( 0 1 l-2/13 -1/13)
-L(1 0 l 3/13 -5/13 ) (1 5)-1 (3/13 -5/13)
(0 1 l-2/13 -1/13 ) (2 -3) =(2/13 1/13)