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2014-03-20T21:02:18+02:00
A+ a+1+a+2. /3=17.5. .............3a+3=3•17.5.....3a=52.5-3......3a=49.5=> a= 49.5/3=16.5...........a+1=17.5......a+2 (ce iti trebuia tie)=18.5. DECI 18.5
Stai lasa credeam ca sunt 3 nr consecutive.... Dar intelegi metoda si formulele..