u = u(x), v = v(x) .
.
, :
- .
: 2 u dv. , , , : , .
:
I. ; ; ( m =const). u , dv (u = x).
II. ; ; ; ; ( m =const). xdx = dv.
4. .
I- , u 5 2: u = 5 2, dv = e 3 x ∙ dx.
= =
( ) = =
= .
: = .
4.
.1 -.
. .
-
- :
1. .
2. .
1:
.2.
.
.
, , .
:
: .
2:
, :
- :
5. ()
. 1.
.: : F(x, y, y, y, , y(n)) = 0, = (), .
, , .
n- , : (n) = f(x, y, y, , y(n-1)).
n- = φ(, 1, 2, , n) ( Ci ), . .
: (, ,1,2, ,n) = 0, , .
|
|
.
.2. I
I : F(x, y, y) = 0.
: y = f(x, y)
(, )dx + Q(x, y)dy = 0.
.: y = f(x, y), y(x0) = y0, .
I = φ(, ) ( = const), . :
1) ;
2) y(x0) = y0, =0, . = φ(, 0) .
, . I.