tim trung binh cong cua day so sau 1,3,5,7...,2009,2011.
minh cho dong ma viet
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trun g bình cộng là:
( 2011+1 ) : 2 = 1006
Dễ ợt . Em đang học lớp 3 mà đã làm rùi nè . Trung bình cộng của dãy đó là (2011+ 1) : 2 = 1006
