2009.09-10 数学寂静讨论贴 76-100题

catfightcat

onedayling  我80的这个变体也是 ，算出来始终是A先着地的~~~ 是不是答案给错了呀？！

金布布

89题我也算的得4/9

jiangdacool

顶

doctortt

79 Version 2 - do you think it's below?

有一道是个数列题，告诉你一个数列，S1=S2=3，Sn=（S(n-1)/S(n-2))^2，求S5

选项A。1/81，B。1/9，C。1 ，D。9，E。81

我选的是A

doctortt

謝謝你們回答89v1 and 2

[此贴子已经被作者于2009/10/9 11:53:49编辑过]

转转陀螺

78题JJ中答案是对的，不过公式是错的。

1/3x*0.04+2/3x*0.06=320 解出x=6000

keren0916

94.这三个数中 我选21. 因为平行四边形的面积肯定小于矩形，就是小于42.

想請問定義上，矩形是否包含在平行四邊形裡呢?

 

jasminexie

85:还有一道 43个人排的队  J排在B的前面 J后面有20人 B前面30人  问他俩中间的人数  选7

怎么算的，想不明白，请指点

iris1989

我下周二早场杀G，能不能麻烦你所说的那位大牛赶紧把总结贴写出来啊，很多题讨论不出来结果，多谢啦~

doctortt

83.一個考生found the original GWD問題, 謝謝他/她

Four extra-large sandwiches of exactly the same size were ordered for m students, where m > 4.  Three of the sandwiches were evenly divided among the students.  Since 4 students did not want any of the fourth sandwich, it was evenly divided among the remaining students.  If Carol ate one piece from each of the four sandwiches, the amount of sandwich that she ate would be what fraction of a whole extra-large sandwich?

答案是E ( 4M-12)/M(M-4)