[轉錄] 奇怪的面積矛盾 by chenyusen
帕索註:此題原po並沒有很仔細說明題目
(也可能是原本就沒有)
問題一:假設此圖形「左右對稱」,那麼原po所做的二種算法似乎都是正確的。
但為何答案不一樣呢?問題出在哪裡?
問題二:如果沒有預設圖形左右對稱,原po的算法顯然是錯的。
那麼正確是算法是什麼?答案又應該是什麼呢?
※ [本文轉錄自 ask 看板 #1CqiI2rh ]
作者: chenyusen (FUTURE) 看板: ask
標題: [請問] 數學問題
時間: Thu Nov 4 22:34:39 2010
http://0rz.tw/UQCgL
上面是圖,要求塗顏色部份
只是發現一件詭異的事情:
算出來有兩種答案,
一個是8 另一個是7
(1) 長方形剪掉白色部份
8*4 - (3*8/2+3*4/2*2)
=32-24
=8
(2) 兩個鈍角三角形相加減掉重複的三角形
2*4/ 2*2 -2*1/2
=8-1
=7
有人知道哪個是正確答案嗎?
感謝大家
---
如果圖形是左右對稱的話,矛盾是有個合理的解釋...XDDD
如果圖形沒有預設圖形左右對稱,
那麼正確是算法是什麼?答案又應該是什麼呢?
推文中有答案.....
防雷
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◆ From: 218.174.27.161
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還有 42 則推文
還有 1 段內文
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真相大白XDDDD
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對不起,誤導大家。
因為原PO的矛盾是以「左右對稱」為前提,
所以我擅自把它加了進去,
目的是為了讓大家專注於兩次答案矛盾的原因。
現在我已經把題目改為兩個了,應該沒有疑義了吧?XDDDD
※ 編輯: puzzlez 來自: 123.194.21.120 (11/05 08:19)
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