X X = BY, , Y .
X = BY , Y. :
- 7:9, . , , Y. , : ;
- , . , . ;
- Y ( 17:19) 1 ( 17 19), Y ( 2:4) 2 (. 2);
- Ctrl+Shift+Enter. , (!), Ctrl+Shift+Enter.
7:9 .
5. xij
xij
xij = a ij xj,
a ij , 2:4, xj , . 4 7:9.
xij .
5.1. . - - . .
:
- 12:G12, ;
- , . , (. 3). ;
- ( 7:9) ( 7 9);
- Ctrl+Shift+Enter.
12:G12 .
5.2. xij. :
- 22, x11. =A2*E12, , x11 = a 11 x1.
- ( 22:22, 22 , 22. x12 = a 12 x2 x13 = a 13 x3.
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23 =A3*E12 , x21 = a 21 x1, x22 = a 22 x2 x23 = a 23 x3. 24:24.
22:24.