一点１０．１１．ＪＪ

艾草

谢谢楼主！你真是个认真负责的人：）

shqco

thanks a lot .if i can reach the score like u i will feel happy ...

rainman714

不谢  愿大家好运.

米可可

６．问两条平行的线　上面５个点　下面那条４个点问多少个三角形可以连．　　答案是４０吧　如果没记错．

答案应该是70吧

C9,3-C5,3-C4,3或者C5,1*C4,2+C5,2*C4,1

米可可

LZ能否帮忙看一下是否类似下面这篇，我google下来的

This vigilance behaviour allows animals to improve their chances of detecting a predator. Because vigilance conflicts with other activities, animals must decide how to divide their time between those conflicting demands. Vigilance has become a central topic in behavioural ecology, providing a model system for investigating behavioural adaptation.

Many animals are gregarious and the reasons for, and consequences of, this behaviour continue to be the focus of considerable interest. It has been hypothesized that grouping should affect the balance between vigilance and other activities. Assuming that individuals scan independently and that the probability of at least one group member detecting a predator stays constant with increasing group size, individual vigilance rate should decline with increasing group size.

Such a relationship has been reported in species ranging from ostriches to parrots and kangaroos to wildebeeste. However, a common problem is to determine whether a correlation implies a causative effect. Variables which might confound a relationship between group size and vigilance include competition for food: if there is more competition in larger groups, a reduction in vigilance in larger groups may be a consequence of this rather than group size per se. The problem then is to provide a convincing demonstration of a direct effect of group size on vigilance.

Cantaloupe

搂住好恩啊！·

rainman714

15楼的朋友  我觉得很类似但是有些不一样

想桐桐的蝎子

３．Ｗ为员工总数，把员工分３组，然后会多出一个人来，问下面３组可能是各组员工人数选项的　　答案好象是Ｗ－１／３，Ｗ－１／３，Ｗ＋２／３． 这题是什么意思啊

[此贴子已经被作者于2006-10-12 18:05:21编辑过]

kangchia

Ｗ－１／３，Ｗ－１／３，Ｗ＋２／３  

i feel that this answer is incorrect

if Ｗ－１／３，Ｗ－１／３，Ｗ＋２／３  is answer

where is {多出一个人}

cornhusker

对阿，应该选三组人数相加为W-1的选项吧，以上选项中，(w-1/3)+(w-1/3)+(w+2/3)=w， 不对的。