30- :
= 84 . 1 = 11 4 = 44 ().
1/3 1. 1/3 1 =44 . : 3 = 15 .
: 84 . : 2 = 42 .
1/3 1: 42 . : 3 = 14 .
1- , - . 14: 2- 7.
7 3 = 3 . + 4 .
В 1- 2 = 2 . + 2 . + 3 .
В = 14 .
3- . 14 : 3 = 4 3 2 . 3, 3, 4, 4.
В 1- , 4 "". . () , "".
, , . , . .
- , . , , . В ( 424).
, . 1x1, 2x2 "", .
425.