作者查詢 / IanHsia
作者 IanHsia 在 PTT [ Math ] 看板的留言(推文), 共95則
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1F→:如果你有看上面這串討論文 你也不會發這篇了04/13 22:03
2F→:你整串系列文看下來你就不會發這篇了...04/13 14:56
7F推:3.根據繁雜的配方後:(2x+y-3)^2+(2y-1/4)^2-73/804/13 08:15
8F→:所以最小值-73/8...有算錯請指正 一夜沒睡有點昏04/13 08:16
11F推:XDD我也配好幾次 且剛剛偏微後確認無誤..04/13 08:29
6F推:泡泡龍好可愛喔0.004/13 07:46
8F→:可以借來當簽名檔嗎0.004/13 07:47
15F推:我覺得28行有點出關鍵來了..04/13 07:50
16F→:感謝XD04/13 07:51
18F→:因為括號先做之後 原式變成 30÷2x5 ÷504/13 07:51
19F→:我覺得問題就在這裡欸... 君不見上幾篇大多人問題在.04/13 07:52
20F→:2(2+3) 到底怎麼看 前面的2是要當係數還是補乘號04/13 07:52
21F→:可是 這篇很簡單的指出說 括號做完後 原式變成..04/13 07:53
23F→:30÷2x5 ÷5 <=這樣一來就回歸原始了04/13 07:53
27F→:對 括號內先算這應該沒問題吧?04/13 07:54
28F→:所以做完後 會變成 30÷2x5 ÷504/13 07:54
30F→:而不是 30÷2(5) ÷5 因為這時候不需要括號阿...04/13 07:54
32F→:好吧 我懂你意思=.=04/13 07:56
9F推:你真的矛盾了...04/13 04:53
10F→:你原本"30÷2(2+3)÷5是多少？"的論點是 2(2+3)先算04/13 04:54
11F→:如今你這篇文章兩種狀況2(2+x)都沒有先算了04/13 04:54
2F推:說老實話 從學會使用括號後.. 為了避免誤會還的確都04/13 03:47
3F→:會加括號 以防這種情形發生= =04/13 03:48
5F→:即便那個誇號根本不需要..04/13 03:48
6F→:就像計算時 式子列到這 如果我想表示的是"15"的解04/13 03:49
7F→:我就會(30÷2)(2+3)÷5 多這個括號 如果是另一個04/13 03:50
8F→:就像這篇給的30÷[2(2+3)]÷5 ....=.=04/13 03:50
13F推:我也想看看國外會怎麼解XD04/13 03:08
2F推:所有:C52選5 同花順:C4花選1*C10種連五張選1種04/13 02:52
3F→:鐵支:C13種數字選1種來鐵支*C剩下48張選1來湊04/13 02:52
283F推:1/2/3=1/6左到右阿XD04/13 04:06
286F→:所以真的 避免誤會請善用括號.....04/13 04:07
20F推:這篇超清楚的阿 2x直接並著看的 是因為2x此項前後常04/13 01:17
21F→:為+-... 在處理未知數列式時 遇到除一定是寫成分式04/13 01:18
23F→:如果在列式時 2x是一起看的條件 則你會預設為(2x)04/13 01:19
26F推:2x/2x=1 答案不會變成x^2 是因為(2x)是一起看的04/13 01:27
27F→:且也只有在代數 才會有這種東西04/13 01:27
30F→:原題目很單純就是基本四則運算 根本就不用考慮啥係數04/13 01:28
37F推:對呀 所以我們會寫成1 除了直接使用分數來看04/13 01:36
38F→:在代數裡也有(2x)的意思 當然乘號寫出來就是x^204/13 01:37