4 | ( | 2 3 |
) | + | ( | -1 1 |
) | - 3 | ( | 2 -1 |
) | + 2 | ( | 1 -2 |
) |
a = | ( | 3 4 |
) | , b = | ( | -5 2 |
) |
3 | ( | 1 3 |
-2 4 |
) | - 6 | ( | -2 -1 |
1 2 |
) |
( | 1 2 3 |
6 7 8 |
-1 4 -5 |
) |
( | 1 2 3 |
8 7 6 |
-7 -5 -3 |
) |
( | 2 1 -3 |
1 2 1 |
0 1 2 |
) |
{ |
3 x + 2 y + 7 z = 12
2 x + 4 y + 10 z = 16 x + 3 y + 7 z = 11 |
( | 2 -1 0 -1 |
-1 2 -1 0 |
0 -1 2 -1 |
-1 0 -1 2 |
) |
( | 3 4 |
2 3 |
) | ( | x y |
) | = | ( | 5 -7 |
) |
( | 1 4 7 |
2 5 8 |
3 6 9 |
) |
det | ( | ( | a c |
b d |
) | ( | e g |
f h |
) | ) | = | det | ( | a c |
b d |
) | det | ( | e g |
f h |
) |
( | 1 -2 1 |
-4 5 -3 |
3 -2 2 |
) |
A = | ( | a d g |
b e h |
c f i |
) |
A = | ( | 1 -1 2 |
-2 3 -3 |
4 2 -1 |
) |
A = | ( | a 0 0 |
b d 0 |
c e f |
) |
A = | ( | 0 0 1 |
0 2 0 |
1 0 0 |
) |
( | 1 2 3 |
) | × | ( | -1 4 -2 |
) |