C . , – . , , , . , 6, 7, 8, 9. , . , : – 6, – 7, – 8, – 9. . 66. .
. 44=16. , . 20. 20+16=36. 66=36
. , , .
, 10 0, , 11? :
( 52): 5_2
: 5_(5+2)_2
, : 572.
, , : 9_(9+9)_9 (9+1)_8_9 10_8_9 1089 – .
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