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2014-04-22T02:01:39+03:00
Ma=a+b+c/3=   12,803+9,508+6,307/3=  28,618/3=9,539 (3)
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2014-04-22T07:26:42+03:00

ma=a+b+c:3=  ( 12,803+9,508+6,307):3=  28,618:3=9,539 (3)