, :
= .
-:
= , X = .
, , :
= = .
.
. (D ≠ 0), -1. ,
-1() = -1.
,
(-1) = -1.
-1 = = ,
= -1.
, , :
1. -1.
2. -1 - , . . -1.
3. , .
1. . 10. -1. : D = ≠ 0. : 11 = 4; 12 = - 3; 21 = - 2; 22 = 1. , : . , 1/ D = - 1 / 2, : -1 = . 20. -1 : = -1 = . 30. , 1 = 3, 2 = 2. |