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2014-09-29T11:50:12+03:00
S = !+2+3+..........+199 = 199×200 /2 = 19900 ⇒ A= 199 +200·199 = 199·200 ⇒√A =√39999 =√(3,9999×10000) =1,999975×100 = 199,9975∈Q