2xn nx2 .
1. , () .
2. () , , () . () .
3. , () .
4. , , . XY A1A2 ( 5.1). U = (u1, u2). U u1 A1, - u2 A2. 1 1, 2 2.
1 2 . ( OY) 1, A2. A1, B1 B 2, B2 5. 2 5 OY B1 B2. B'1 B'2 ( 6 4).
B1 B'1, B2 B'2, , OX .
, B1B'1 OX A A1 A2( u1 u2) B1 B.
5.1 5.3 ( )
, B1MB'2 A . , , U* = (, ), v.
M , B1B'1 B2B'2.
. , , :
.
B1B'1:
= y = 4x + 2. |
B2B'2:
= y = -x + 5. |
:
|
:
4x + 2 = -x + 5, 5x = 3, x = 3/5, y = -3/5 + 5 = 22/5. |
, U* = (2/5, 3/5), v = 22/5.
B. , , , 5.2 A2MA'1.
|
|
5.2 5.3 ( B)
.