求教几个prep的数学题，NN们给指教一下啊，多谢啦

jrinbj · 发表于 2011-9-3 14:14:07

1. If 500 is the multiple of 100 that is closest to x and 400 is the multiple of 100 that is closest to y, which multiple of 100 is closest to x+y?
(1) x<500
(2)y<400

2. Is the interger n odd?
(1) n is divisble by 3
(2) 2n is divisible by twice as many possitive intergers as n

3. 说是有四封信，分别装进四个写有不同地址的信封里，问只有一封信放对信封的概率是多少？

jrinbj · 发表于 2011-9-3 14:44:27

补充下，第1题答案选E，第二题选B，第三题1/3,不明白为什么，恳求大牛指点

cecilia199004 · 发表于 2011-9-3 15:04:18

同问第一个啊~~~上午刚摸完~~~

angelcity · 发表于 2011-9-8 22:47:52

第二题我正好也有疑惑,搜到别的同学的翻译:
如果n可以被x个正整数整除的话,2n就可以被2x个正整数整除.
the number of cows is more than twice as many as that of pigs.
牛比猪的两倍还多.

求教几个prep的数学题，NN们给指教一下啊，多谢啦

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