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标题: one question for a september math problem? [打印本页]

作者: gmat2002 时间: 2002-9-16 12:07 标题: one question for a september math problem?

DS m的个位数＝？（1）m+2个位数为9 (2) 2m 个位数为 4
【确定】 A

I have some questions about this one. If a number is -11, his unit m is -1 or 1??

Thanks!

作者: tongxun 时间: 2002-9-16 12:20

题目问的是m的个位数啊。7+2=9。能将你的问题写的更明确一些吗？

作者: gansen 时间: 2002-9-16 17:04

hi, gmat2002
i think if the number m=-11, its digit number is 1, so it doen't fit for the first condition. so the answer of this question should be A

tongxue, am i right?

作者: tongxun 时间: 2002-9-16 17:25

yes，you are definately right， gansen。
-11， the digit of it is 1。

作者: gmat2002 时间: 2002-9-17 09:01

so it means for condition one
m + 2 unit is 9. m can be -11 or 7. So we can not confirm its unit number???

作者: tongxun 时间: 2002-9-17 10:48

-9 的个位是9吗？我有点糊涂了。那位帮忙回答以下。

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