, 20 2015 . 13:30
+
--
1.
500 -600 =10
2.
(200 ):
1 80 500
, 40-50 , 10-15
,
(80 ) . , , (, 3)
20 1 ² .
30
15 1 ².
( ) - 10 1 ² 15 1 ².
20 1 ².
- 5 () 1 ², 25 , 20 .
(5:1) (12:1) .
"" , .
, "" "" (3 10 , 1 1 ).
"":
1 -
2 - .
3 -
4 -
5 -
6 -
...
21 - -
22 -
23 -
