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erping999 - July 20, 2021 @ 10:22 am · Filed under Erping’s Reading Notes

奥数题：小明一生中经历了——2次千年一遇的地震，7次500年一遇的大水和泥石流，20次100年一遇的大雨。
问：小明今年多少岁？

（轉自網路）

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