标题: 求教一道数学题 [打印本页] 作者: 尛尛 时间: 2011-9-4 20:07 标题: 求教一道数学题 Aset of numbers has the property that for any number t in the set, t + 2 is inthe set. If –1 is in the set, which ofthe following must also be in the set?
I. -3 II. 1 III. 5
A. Ionly B. IIonly C. Iand II only D. IIand III only E. I,II, and III 这道题为什么选D 而不选 E呢作者: 尛尛 时间: 2011-9-4 22:00
？