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作者 C2C 在 PTT [ Math ] 看板的留言(推文), 共39則
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18F推:我比較好奇負一的三次根號09/26 12:46
2F→:讚嘆!好美的演算法!09/10 15:30
10F→:2r^3)/3 ,樓上兩位是正確答案09/10 15:27
15F→:數學永遠都能給我帶來新的感動!09/11 23:36
17F推:數論一向是理解題目很簡單,如何解卻很難06/27 13:15
9F→:是脖子,因為天鵝跟鴨子最明顯的分別。這題是考生物05/08 23:28
1F推:題目怪怪的,X^2+1怎麼是四次多項式? 沒抄錯?05/08 23:24
4F→:你第三行抄錯啦05/08 23:29
5F→:還有,F 與 f,到底是哪一個,一直改,怎麼解題?05/08 23:30
7F→:x 與X,到底是哪一個才對?05/08 23:30
8F→:連符號都沒辦法寫清楚嗎?05/08 23:31
10F→:按E修改題目吧05/08 23:40
11F→:第一行的f(x) 與第三行的 f(x)明顯不一樣,怎麼會寫05/08 23:54
12F→:在同一題。還有,第三行怎麼會是方程式,除非f(x)=005/08 23:54
13F→:喔,我誤解了,原來題目是四次多項式=x^2+1,抱歉05/08 23:55
14F推:已經知道兩個根,3+根號2,1+2i,因為是實係數方程式05/09 00:04
15F→:所以另外兩根就是3-根號2,1-2i05/09 00:05
17F推:喔 感謝05/09 00:09
21F推:哦,原po是想找f(x)=x^2+1 何時沒有實數解,對嗎?05/09 00:12
25F推:>LPH66,恩,謝謝05/09 00:22
1F推:(3x+2k+5)(3x+2k+1)=005/08 23:08
2F推:(2k+5)(2k+1)<005/08 23:10
3F→:-5/2 <k< -1/205/08 23:10
6F推:我算錯了,05/08 23:17
7F推:-(2k+5)/3 <0 , -(2k+1)/3 >105/08 23:20
8F→:-2.5<k<-205/08 23:20
10F推:基本功不紮實,觀念一定不好05/08 23:27
13F→:不行05/08 23:32
15F推:他給你兩根各自的範圍,就一定讓你可以十字交乘分解05/08 23:39
16F→:因式分解需要洞察力 (湊答案05/08 23:40
19F推:計算能力夠好,才考慮公式解。計算力好,也就能十字05/08 23:45
23F推:樓上的方法很棒05/08 23:52
2F→:gcd(132,300)05/08 23:12
1F推:dx是 長度05/08 19:37
1F推:沒有很重要05/07 23:13
6F推:既然能求出銳角,那麼鈍角算不算也無所謂了05/08 19:55
7F→:就只是互補的兩個角而已05/08 19:55