两道题，没怎么想明白，大家议一下哈

wynyy2000 · 发表于 2011-3-24 22:49:08

If S is a set of four numbers w, x, y and z, is the range of the numbers in S greater than 2?
1.w-z>2
2. z is the least number in S 答案A
我的疑问是：w,x,y,z 又不是按大小顺序排的，为什么w-z>2 就可以判断S的值域？

Can the positive integer p be expressed as the product of two integers, each of which is greater than 1?
1.31<p<37 2. p is odd 答案A
in statement 1 , 32 33 34 35 36 could be expressed as two numbers that are greater than 1, however, all of these numbers can also be expressed as 1* itself, 所以也不对啊？！

甜你一口 · 发表于 2011-3-25 00:02:39

第一个不懂
第二个，题目是问p能不能拆成两个数的乘积，32 33 34 35 36 都可以，那就是p能被拆成两个数乘积
B的条件只要是质数就会不满足，不是质数就满足所以不能确定

carypig · 发表于 2011-3-25 01:22:01

1. 既然w-Z>2, 那不管X，Y是什么，S的值域都大于2.
如果x，y都小于w,那值域就是w-z, 根据条件it is greater than 2
如果x,y中都大于或等于w,那值域就是最大的数减去z，其值仍然greater than2
如果x,y一个大于w,一个小于w,那值域就是大于w的数减去z,其值照样great than 2

只有上面三种情况了。。所以值域永远大于2

2. "integers, each of which is GREATER THAN 1"....

If S is a set of four numbers w, x, y and z, is the range of the numbers in S greater than 2?
1.w-z>2
2. z is the least number in S 答案A
我的疑问是：w,x,y,z 又不是按大小顺序排的，为什么w-z>2 就可以判断S的值域？

Can the positive integer p be expressed as the product of two integers, each of which is greater than 1?
1.31<p<37 2. p is odd 答案A
in statement 1 , 32 33 34 35 36 could be expressed as two numbers that are greater than 1, however, all of these numbers can also be expressed as 1* itself, 所以也不对啊？！

-- by 会员 wynyy2000 (2011/3/24 22:49:08)

两道题，没怎么想明白，大家议一下哈

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