Re: [計量] 兩題數學
※ 引述《sabinayang (Sabina)》之銘言：
: 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)
[1-(1/k)]/n = [(k-1)/k]/n = (k-1)/nk
: 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)
1/(1/3-1/10) = 1/(7/30)
: 麻煩大家瞜
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