( 11475 )
↓
.
2 (4, 6, 8, 10) = =52,5 (56, 61, 66, 70) / =21 (23, 25, 27, 28)
. , . : 4 (6; 8-10; 12; 14-16 )
: 4 (6; 8-10; 12; 14-16 )
, , )