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2014-07-01T15:09:21+03:00
A=8-3√7 +1/2 *(9+6√7+7)

a=8-3√7+1/2 * (16+6√7)

a=8-3√7 +1/2 *2(8+3√7)

a=8-3√7+8+3√7

a=8+8=16

ma=(a+b)/2=  (16+24)/2=  40/2=20