求解一道GMAT OG if r and s are positive integers,can the fraction r/s be expressed as a decimal with only a finite number of nonzero digits?(1) s is a factor of 100(2) r is a factor of 100

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求解一道GMATOGifrandsarepositiveintegers,canthefractionr/sbeexpressedasadecimalwithonlyafinitenumberofno

求解一道GMAT OG if r and s are positive integers,can the fraction r/s be expressed as a decimal with only a finite number of nonzero digits?(1) s is a factor of 100(2) r is a factor of 100
求解一道GMAT OG
if r and s are positive integers,can the fraction r/s be expressed as a decimal with only a finite number of nonzero digits?
(1) s is a factor of 100
(2) r is a factor of 100

求解一道GMAT OG if r and s are positive integers,can the fraction r/s be expressed as a decimal with only a finite number of nonzero digits?(1) s is a factor of 100(2) r is a factor of 100
既然是100的因数就不用一般证明了咯,因为100的因数就只有1,2,4,5,10,20,25,50,100这几个,两个一除剩下的顶多是1/100也就是0.01,其它都是0.01的倍数.
等等.我们看到的是同一道题目吗?为什么其他人的答案都.而且还是选择题?

选E吧都不成立

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应该这样翻：
有一些人，每人写下前30个正整数中的一个（应该是1-30）。问：是否有任何一个数字被一个以上的人写下？（是否有两个或两个以上的人写下同样的数字？）
1.有超过40个人写这些数字
2.有少于70个人写这些数字
题目问的是，有没有任何数字被2个或者以上的人写下？只要1到30的任何一个数字满足这个条件，就可以了。所以，如果有30个人，恰巧这些人写的数字不同，那就不满足题目的问题。但是，如果有31个或以上的人，肯定会有两个人写了同样的数字.对吧？
所以，条件1肯定能满足问题，是正确的
条件2存在两个情况，当人数大于30小于70时，回答是肯定的；当人数小于30时，回答是否定的。所以2是不能回答题目的问题。
因此，条件1本身是充分的，选A
以上回答你满意么？

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