, .
,
, (3)
.
. ( ) ( , ) .
,
,
,
k ≤ n, aii ≠ 0, . aii .
( ) .
: 1. , . . k = n, . n, xn-1, , (xn-2,..., x1).
2. (3), , . , 11 1 ( , a11 ≠ 1).
. :
,
,
.
: :
~ ~ ~
x1 + x2 + x3 = 3,
x2 = 1,
x3 = 1.
, = 1, 2 = 1, 1 = 1.
.
,
,
.
, (r() = r()), () 1 = 2 =... = n = 0.
?
4. , , , r , . . r < .
5. , , , Δ , . . Δ = 0.
, Δ = 0. Δ ≠ 0 , . Δ = 0, r , . . r < n. , , () .
.
x1 2x2 + 4x3 = 0,
2x1 3x2 + 5x3 = 0.
: , r(A) = 2 (), n = 3.
r < n, .
.
x1 2x2 = 4x3,
2x1 3x2 = 5x3.
, . ,
, .
x3 = 0, : x1 = 0, 2 =0, x3 = 0. 3 = 1, : x1 = 2, 2 = 3, x3 = 1 . .
|
|