! 11 , , , . .
* 2 = 2*
[] [] = [] [] = []
([] []) [] = [] (|] [])
[ ([] + [])= [] [] + [] []
, , * = *.
:
det (A ) = det A det - .
̳
, , :
,
(-1), , :
ij=(-1)i+j*Mij
.
, []. ij jjT. =.
fx - -()- - mxn - - [F2]-{Ctrl-Shift-Enter] ---- .
[] ,
: , []-1 , , , det ≠ 0.
det = 0, .
:
- (det ≠ 0);
- () ( );
- ;
- -1=1/detA *
: -1* = ( ) + [F2]-{Ctrl-Shift-Enter]
= / -1 = *
-1 = /
fx - () mxn - - [F2]-{Ctrl-Shift-Enter] ----
:
1) .
2) , . j :
11 12 1n
[ *] = 21 22 2n
m1 m2 mn
3)
11 12 1n
[ ] = 21 22 2n
m1 m2 mn
4) :
: -1* =