(1)-(5) .
n x 1, , xn n - .
n - .
.
, 1 2 12 (. 2), .. = λ 1 + (1-λ) 2, 0 ≤ λ ≤ 1, . . 1 2 .
2
2. .
.. .
, >0, , , │ │≤ .
.
.. ( , . 3, ) ( , . 3, ), .. (. 3, ) (. 3, ), , .
3
( 1, , n), 1 1++ nxn = a, .
(1) 1 1++ nxn = f , , f (. 5).
5
= ( 1; ; n), , f.
f ( ), .
:
* = ( *1; ; * n) , (2)-(5), (1), () f.
, n = 2 - :
(31)-(33) :
* = ( *1, * 2) ( ) , (32)-(33), (31), () f (. 6).
f = const .
6
, (31)-(33) (. 7):
1) ( ) ;
2) = ( 1, 2) f= const, f = 0;
3) f = 0 (- ) max (B min), f ();
|
|
4) , , , f max (f min).
7
( ) (. 8).
8, , ; . 8, , (f →-∞); . 8, (f →+∞) (f →-∞).
8
: , .
.
f = 1 + 3 2
.
. , .
.
, , 1 2, , - , .
, , ; , .
1 3 1 + 2 2 = 6, 3 1 + 2 2 ≤ 6 , , (0; 0): 30+20≤6 0<6.
, (0; 0) .
, , .
2 3 1=0,5 2 = 1, , , D, .
= ( 1; 2) = (1; 3) f = 0, .
f = 0 (1/2; 0) (. f min), f min = 0,5, (4/3; 1) (. f max), f f max = 4,33.
end.
2.
f = 1 + 2
1 + 2 ≤ -1;
1 ≥ 0;
2 ≥ 0;
:
, .
1 + 2 ≤ -1 , , 1 + 2 ≤ -1.
( ), , .
3.
f = 1 + 2
1 - 2 ≤ 1;
1 ≥ 0;
2 ≥ 0;
4.
f = 1 + 2
|
|
1 + 2 2 ≤ 1;
2 1 + 2 ≤ 1;
1 ≥ 0;
2 ≥ 0;
:
, , 1 + 2 2 ≤ 1; 2 1 + 2 ≤ 1; ()
. . , , .
1 + 2 0 1 + 0 2 = 1/3.
.
5.
f = 1 + 2
1 + 2 2 ≤ 1;
2 1 + 2 ≤ 1;
1 + 2 ≤ 3/5;
1 ≥ 0;
2 ≥ 0;
:
[ , ], .