809*??=800*??+9*??+1 其中??代表的两位数,8*??的结果为两位数，9*??的结果为3位数。求??代表的两位数，及809*??后的结果。-809*?? = 800*??+9*??+1 Where?? Representative of double-digit, 8*?? The results of double-digit, 9*?? The result is 3 digits. Requirements?? Representatives of double-digit, and 809*?? After the results.