作者sabinayang (Sabina)
看板GRE_Verbal
标题[计量] 两题数学
时间Sun Oct 7 13:20:30 2007
One-k th of a circular pie has been served. If the rest of the pie is divided
into n equal servings, then each of these servings is what fraction of the
whole pie?
(A)1/nk (B)(k-n)/nk (C)1/(n-k) (D)(k-1)/nk (E)(k-1)/n
ans:(D)
In a certain country, a perspn is born every 3 seconds and a person dies every
10 seconds. Therefore, the birth and death rates account for a population
growth rate of one person every
(A)10/3sec (B)30/7sec (C)7sec (D)35/3sec (E)13sec
ans:(B)
麻烦大家瞜
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1F：推 BlueKidds:(1)1/k吃完了 剩下k-1/k 123.204.8.187 10/07 13:30
2F：推 BlueKidds:(2)一秒出生1/3 死1/10 一秒人口成长率 123.204.8.187 10/07 13:32
3F：→ BlueKidds:为 1 /(1/3)-(1/10) = 30/7 123.204.8.187 10/07 13:33