:
* :
1) (Circle) .
2) ( Parabola).
3) ( Ellipse).
4) (Hyperbola ).
: ( M(x , y (F(p , 0 (p> 0) " D " . MF = MQ " O " ( v ) ( x ) . e = 1 e
y2 = 4px , p > 0
y2 = 4px
:
: y2 = 12 x
: y2 = 2px
4p = 12
3 = p
∴( F ( 3 , 0
x = p x = 3
x2 = 4py , p > 0
x2 = -4py
: ( V(0,0 (h) (x) (k) (y) :
( V ( h , k
( x ) ( y ) .
:
(y k )2 = 4p (x h ) .. (3)
(x h ) 2 = 4p (y k ) ..(4)
( 3 ) ( 4 ) ( V ( h , k
( )
:
( ) :
(V ( h , k
(F ( p + h , k
x = p + h :
y = k
( ) :
(V ( h , k
(F ( p + h , k
x = p + h :
y = k
: .
( y + 1 )2 = 4 ( x 4 )
( y k )2 = 4 p ( x h )
:
(V ( h , k ) = ( 4 , 1 , 4p = 4 p = 1
(F( p + h , k ) = ( 1 + 4 , 1 ) = ( 5 , 1
x = p + h :
x = 1 + 4 = 3
y = k y = 1
ȿ
: 1 (0 1 )
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