- 2


:

 

 

 

 

 

 

:

1.

2.

3.

= ? <N>

 

 


n =1 n = 2 n = 3

 


 

 

 

 

 


­ :

 

_

( :)

(1. ) (150,50)-(100,100)

(2. ) (150,50)-(200,100)

(3. ) (100,100)-(200,100)

(=, )

 

_

= 1 _

_

= 2 (50,50)-(150,100)

_

= 3

_ _

( ) ( 100,100),20

(100,100),50

 

­ , ­ - .




- -  - -  - -