1, Có bao nhiêu số có một chữ số: a, 10 b, 9 c, 8 d, 90 2, Số liền trước số lớn nhất có một chữ số là số: a, 8 b, 9 c, 10 d, 11 3, Số liền sau số lớn nhất có hai chữ số là số: a, 10 b, 9 c, 99 d, 100 4, Số ở giữa số 25 và 27 là số: a, 28 b, 24 c, 26

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