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。

推荐阅读：
Million-Dollar Bloggers Share Their Secrets For Success　 3 Things Your Small Business Blog Needs To Be Successful　 Content Creation Startup, Presto Media Sees Incredible Success W　 These Nightmare Stories Will Remind You How Important It Is To B　 Your Blog as an ROI Generator　 How Blogging Has Become An Important Tool In Schools　 5 Of The World’s Greatest Marketing Blog Posts And What We Can L　 3 Ways to Create a Killer Blog　 How the Bitcoin Market is Recovering from the Bitfinex Hack　 Singaporean Blogger Amos Yee Pleads Guilty to More Charges; Goin