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作者 ice80712 在 PTT [ tutor ] 看板的留言(推文), 共43則
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12F推:你就想成兩個函數 f(x)>=g(x) 等號成立的時候 x=3/207/11 00:55
13F→:但是f(x)的最小值卻不在x=3/2的時候07/11 00:57
5F→:學生不想學神仙也難救05/23 11:27
4F推:當正職錢是不會少 但很難再去學習其他專業領域的知識了04/22 00:40
5F→:個人是不想到了三 四十歲還去做那種大學生就可以做的工作04/22 00:42
15F推:大推Cabri 3D 以前高中科展常用到 不過是學校出的錢XD03/14 23:26
5F→:離子的游離能就看半徑大小吧03/12 22:48
34F推:還蠻有鑑別度的...有些題目比較需要用直覺 計算反而麻煩01/18 23:04
2F→:當你用x^2=8y代進圓的方程式後 且x與y都要有實數解12/10 02:03
3F→:就已經產生判別式>=0 且 兩根皆大於等於0 的條件12/10 02:05
4F→:判別式只用一次的話是只有針對y 對x還要再用一次12/10 02:07
5F→:只是x^2=8y這個形式比較簡單不需要用判別式12/10 02:10
48F推:家教老師有時候是很卑微的 賺錢還得看別人臉色 看開點吧11/24 19:08
13F推:第3題 把第一式x的範圍帶到第二式 討論無解時a的範圍11/23 02:32
7F→:就算是整數也不能用牛頓 三次式未必有有理根11/22 00:53
9F→:x^3-2=0 x=2開三次根號(無理根) 另外兩根為虛數11/23 01:26
10F→:無理根成對是用在形如a+b根號c的無理根才適用11/23 01:29