Răspunsuri

2014-08-20T17:20:48+03:00
-5 ≤ 2x+1  < 108 | -1

-6 ≤ 2x < 107  |:2

-3 ≤ x < 53,5

x∈N          => A={0,1,2,3,4,5,6,7.....,53}


suma elementelor multimii A este 

S=(0+53)*54/2

S=53*27

S=1431