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作者 tera 在 PTT [ Math ] 看板的留言(推文), 共21則
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29F推:順序不管怎麼換當然都會是9因為你已經預設2(1+2)不為05/04 21:42
30F→:一體囉 用代數來看的話,(1+2)這項之係數為2 又會有另05/04 21:43
31F→:外的解讀方式05/04 21:43
32F推:搬搬樂 6÷2(1+2)=6(1+2)÷2(1+2)(1+2)05/04 21:54
33F→:=6(1+2)÷6(1+2) 然後答案為九 這樣似乎有點有趣XD05/04 21:55
35F推:我只是說 用代數來解讀看是一體 用純數來解讀非一體05/04 22:38
36F推:僅僅是把2作為"(1+2)"的係數 一定要把(1+2)當成X嗎?05/05 15:19
37F→:你把2(1+2)視為2乘上(1+2)這項數學運算,把2(1+2)視為05/05 15:21
38F→:一個具有2這個係數的值也是另外一種看法05/05 15:21
39F推:站在把2(1+2)等同於2乘上(1+2)的觀點時,當然怎麼搬都05/05 15:25
40F→:是9囉 我是認為兩種答案都可以合理解釋的 題目問題05/05 15:26
1F推:最大的問題就是原題目省略了乘號 純數運算中不能省略05/04 15:39
2F→:乘號05/04 15:39
3F→:只有在代數運算才會省略乘號 但是那樣2(1+2)前面的205/04 15:41
4F→:就變成(1+2)的係數了05/04 15:41
5F→:所以題目出的故意不清不楚玩弄答題者05/04 15:42
11F推:http://www.purplemath.com/modules/orderops2.htm05/04 17:09
12F→:有沒有省略乘號的差異 請直接看吧05/04 17:10
13F→:最後一個圖 我想很清楚了05/04 17:11
14F→:空白視同乘號是代數才教的規則喔05/04 17:13
19F推:樓上當你這樣寫的時候你已經寫成代數運算了05/04 20:40
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