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)
One-k th of a circular pie has been served->剩下1-1/k 的pie
divided into n equal servings->每個serving為(1-1/k)/n
the whole pie 為 1
所求為(1-1/k)/n除以 1 =(1-1/k)/n
分子分母同乘k->(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)
由題目 1秒->1/3 個人生出
1秒->1/10個人死亡
->1秒有1/3-1/10=7/30個人生出
->1個人生出需要30/7秒(7/30 * "30/"7 =1)
大概是這樣吧XD
--
※ 發信站: 批踢踢實業坊(ptt.cc)
◆ From: 140.112.243.79
→
10/07 13:48, , 1F
10/07 13:48, 1F
推
10/07 13:53, , 2F
10/07 13:53, 2F
討論串 (同標題文章)
GRE 近期熱門文章
PTT職涯區 即時熱門文章