求助og 绿皮DS41

sunnysunny11 · 发表于 2010-7-26 11:54:58

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
这个题的答案是A，但我有几点不明白。首先值域是因变量的取值范围吧，这个题里就没有因变量，答案给的值域解释是the range of numbers w, x, y, and z is equal to the greatest of those numbers minus the least of those numbers,不明白。再就是答案解释第一个条件sufficent时说this reveals that the difference between two of the numbers in the set is greater than 2, which means that the range of the four numbers must also be greater than 2, 解释的感觉不对吧。望牛人指点谢谢。

sunnysunny11 · 发表于 2010-7-26 19:02:03

麻烦大家回答一下啊

zhuazizhang · 发表于 2010-7-26 19:19:05

它问的是range 就是维度
条件1 已经说明了维度肯定大于2 所以就有A
条件2 知道最小值还是不知道维度也不能推出维度

所以选A

求助og 绿皮DS41

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