7.1. , , . (t) (t)
ì dx
ï dt
í dy
= a 11 x + a 12 y,
(7.1)
ï
î dt
= a 21
x + a 22 y.
7.2. (7.1) - . - t:
d x = a
dx + a
dy,
dt 2
11 dt
12 dt
dy -
dt
.
d x - a
dx - a
( +
) = 0
dt 2
11 dt
12 21 22
d
dt
= 1
æ dx - a
x ö. (7.2)
ç
12 è dt
11 ÷
ø
(t):
¢ - ( 11 + 22) ¢ + ( 11 × 22 - 12 × 21) = 0.
(t) , (7.2).
1. - ().
- .
2. - ,
.
3. -
.
4.
. . .
5. - .
. .
6.
. . .
7. . - . .
8. ?
9. - .
- .
10. -
¢ =
f (x). .
11. -
¢ =
f (x, y ¢). .
12. -
¢ =
f (, y ¢). .
|
|
13. ( ).
- .
14. - -
, - .
.
15. -
- , - . .
16. - - , - . .
17. - - ,
|
n (x)
n.
18. - - ,
α (A cosβ x + B sin β x).
19. - ?
20. -
- .