, x, y .
:
F(x,y,y )=0, F(x,y,y )=0, F(x,y,y , , y( n))=0.
, .
( ), .
( ) , .
( ) , , . , .
, . .
.
() .
, ( ) .
.
:
:
.
1. x(1+ )dx=ydy.
* ,
xdx= .
:
= ; = ln(1+ )+ lnC.
, (1/2) In . ,
=ln[ C (1+ )].
. *
:
1)
dx= 3 dy;
dy= dx;
(1+ ) dx= (x- 1) dy.
2) , :
a) ydy=xdx; y=4 x =-2
b) xdy=ydx; y=6 x =2
3. , 5 , .