设该æ°ä¸ºn, åå¢å äº 10n + 3 - n = 9n + 3,
12345A (Aä»0è¯å°9) å¯ä¸å¯ä½¿
12345A = 9n + 3 ä¸nææ´æ°è§£çæ¯(æ¢å¥è¯è¯´, 12345A - 3è½è¢«9æ´é¤)
123456, å³ A æ¯6, è¿ä¸ªæ°æ¯ (123456 - 3)/9 = 13717
137173 - 13717 = 123456
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