[計量] pp2某一題

看板GRE作者 (shadywheat)時間14年前 (2011/09/02 21:41), 編輯推噓4(4推 0噓 6→)
留言10則, 5人參與, 最新討論串1/1
做過兩次了 可是每次都還是想不出個所以然...orz 還請大家幫忙解惑>"< 謝謝!!! 10. A rectangular game board is composed of identical squares arranged in a rectangular array of r rows and r+1 columns. The r rows are numbered from 1 through r and the r+1 columns are numbered from 1 through r+1. If r>10, which of the following represents the number of squares on the board that are neither in the 4th row nor in the 7th column? ^^^^^^^ ^^^ 選項: r^2 - r r^2 - 1 r^2 r^2 + 1 r^2 + r -- ※ 發信站: 批踢踢實業坊(ptt.cc) ◆ From: 111.249.94.100
推
09/02 21:43, , 1F
r(r+1) - r - (r+1) + 1 = r^2 - r
09/02 21:43, 1F
推
09/02 21:43, , 2F
下面neither nor的部份意思是把r(r+1)的這個矩陣拿掉
09/02 21:43, 2F
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09/02 21:44, , 3F
全部 - r那部分的 - r+1那部分的 + 重複算的那一個
09/02 21:44, 3F
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09/02 21:44, , 4F
其中一排和其中一列(哪一排哪一列不重要 所以4th和
09/02 21:44, 4F
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09/02 21:46, , 5F
7th只是用來混淆的)所以拿掉的部分是r+(r+1)-1(排和
09/02 21:46, 5F
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09/02 21:46, , 6F
列重疊的1要扣掉)
09/02 21:46, 6F
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09/02 21:53, , 7F
喔喔~豁然開朗! 我以為"number"是指正方形的編號orz
09/02 21:53, 7F
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09/02 21:53, , 8F
感謝大家的解說!
09/02 21:53, 8F
推
09/03 00:28, , 9F
謝謝大家 當初我做CD看不懂題目XD
09/03 00:28, 9F
推
10/22 12:47, , 10F
這一題我也看不懂題目@@
10/22 12:47, 10F
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