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2014-04-12T20:32:44+03:00
ΔABC, mas<A=90 ⇒TP ca BC²=AB²+AC²=5²+17²=25+289=314  ⇒BC=√314
AM-med ⇒AM=BC/2=√314/2    = (√314/2)²=314/4=78.5 ⇒AM=√78,5