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2022-05-11 20:02:51
2022-05-11 15:41:48
Trung bình 3 số là số ở giữa . Vậy số thứ 2 là :
84 ÷ 3 = 28
Số thứ 1 là :
28 - 1 = 27
Số thứ 3 là :
28+1 = 29
Đáp số : .......