[計量] 請教數學印度機經

看板GRE作者 (cyndi)時間15年前 (2009/06/09 21:22), 編輯推噓3(305)
留言8則, 3人參與, 最新討論串1/1
5. A teacher teaches biology for a group of 53 students. She can divide them into two batches P and Q. If P has 7 batches of n students each and Q has x students of five batches; or six batches (with y students in 5 batches and (y+1) students in 6th batch), then Col A: x Col B: n 請問一下題問到底在問什麼?? 感恩 Given a circle which passes through the points (0, 6) and (8, 0), then Col A: Radius of the circle Col B: 10 -- ※ 發信站: 批踢踢實業坊(ptt.cc) ◆ From: 123.195.62.214

06/09 21:29, , 1F
通通都用batch用字還真是不清楚- -
06/09 21:29, 1F

06/09 21:30, , 2F
應該是53人分兩大組P跟Q,P可以分7組n個人的
06/09 21:30, 2F

06/09 21:30, , 3F
Q可以分成5組x人的,或6組其中每組y人第六組y+1人
06/09 21:30, 3F

06/09 21:31, , 4F
由題可知6y+1是5的倍數,故y為4,x為5,n為4
06/09 21:31, 4F

06/09 21:36, , 5F
6y+1是5的倍數.為啥??
06/09 21:36, 5F
※ 編輯: cyndilin 來自: 123.195.62.214 (06/09 21:53)

06/09 22:55, , 6F
因為5X=6Y+1
06/09 22:55, 6F

06/10 00:38, , 7F
有一個圓通過(0,6)跟(8,0) 故最小圓的直徑=兩點距離
06/10 00:38, 7F

06/10 00:39, , 8F
最大圓不受限,可得半徑>5 無法判斷跟10比誰大
06/10 00:39, 8F
文章代碼(AID): #1ABc7zWu (GRE)