数学题：一个数的近似值是20万，这个数最大是多少？最小是多少？

数学题解答：首先要明确，是省略什么位后面的尾数？由于20万后面带了“万”字，可见是省略万位后面的尾数，所以原来这个数最大是204999，原来这个数最小是195000。

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