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标题: jj Question. [打印本页]

作者: skycrash 时间: 2002-11-9 15:03 标题: jj Question.

just see jj
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"天道酬勤,第一次,轻松过关."
6.有个数列，特征是：若T在此数列，则T+2必定在此数列。已知-1在此数列。则必有：
1）1在此数列
2）-3在此数列
3）5在此数列
My answer: 1+2+3
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but I think it should be 1+3,
if -1 is the first one, -3 won't in it.
Who can confirm it?

作者: sandwolf 时间: 2002-11-9 15:06

逻辑思维：有Ｔ必有Ｔ+２，但是未必有Ｔ+２就有Ｔ。
因而有-1并不见得非得有-3。

[em09][em09][em09][em09][em09][em09]

作者: skycrash 时间: 2002-11-9 15:10

Thank you for your formal explanation.
I think he made a mistake here. That's probably why he only get 49 in math.

作者: yiyuan05 时间: 2002-11-9 16:16

这题应该是1，3正确。

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