按你的思路
A^-1 = 2A*
|(2A)^(-1)-5A*|
= | (1/2)2A* - 5A*|
= | -4 A*|
= (-4)^3 |A*|
= (-4)^3 |A|^(3-1)
= (-4)^3 * (1/4)
= -16.
答案怎么会是 -2
按你的思路
A^-1 = 2A*
|(2A)^(-1)-5A*|
= | (1/2)2A* - 5A*|
= | -4 A*|
= (-4)^3 |A*|
= (-4)^3 |A|^(3-1)
= (-4)^3 * (1/4)
= -16.
答案怎么会是 -2