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: , , ( , , , , ), , .: , , , , .: , , .
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-, , , , .
( - ), 580 . . .
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S = 1/2 abS = a2
:
aaaabbbbcccc
a+b:
:
:
9 12 ?
:
( )PuZZle:
aaabbbccc
PuZZle:
)
MN = CD = 12 = BN = (AB MN)/2 = 4 ADM:
: ABCD ;AC = 16 ; BD = 12 ;: . ODOAT9001010
16
: 9 11 133; 486 , 488 ; ;
:5
!