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作者 s25g5d4 在 PTT [ SENIORHIGH ] 看板的留言(推文), 共168則
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3F→:你不覺得你寫的-3>=3很奇怪嗎...1F講得沒錯10/03 22:50
18F推:拉格朗日有 很長一串08/02 22:01
43F推:第一題答案是1?07/31 23:11
49F推:第一題設z=a+bi a,b為實數 然後去做有理化07/31 23:18
50F推:最後得 -2+ (a^2 + b^2 -1)i / a^2 + (b-1)^207/31 23:26
51F→:又因為為實數 a^2 + b^2 -1 必等於0 可知a^2+b^2=107/31 23:27
53F→:z*共軛z = (a+bi)(a-bi) = a^2+b^2 = 107/31 23:27
54F推:第18題展開整理得x^2 + (...)x + 12-ab = 007/31 23:33
55F→:有實根故判別式大於等於0 意即a^2+(-16+4b)a+16大於等於007/31 23:35
56F→:窩靠 我怎麼會講成第18題..更正 第5題07/31 23:35
57F→:a^2+(-16+4b)a+16 >= 0 將此視為二次函數 於座標平面上可07/31 23:37
58F→:繪出一開口向上之拋物線 且與x軸交點至多一個(或無交點)07/31 23:37
59F→:故知判別式 <= 0 剩下的應該OK吧07/31 23:38
61F推:還有哪題不會?08/02 07:58
67F→:推06/30 22:57
3F推:0.38阿就寫起來跟0.4差不多阿 不會很細拉..07/01 01:02
8F→:這題是統計吧 怎麼會是機率?06/20 14:38
4F→:1F可以再講詳細一點嗎?06/15 22:21
9F→:看懂了..原來是這樣06/15 22:43
4F推:Microsoft表示:06/05 22:26
1F推:第一題你有驗證過A^2 + B^2 = 1嘛?05/22 21:55
1F推:高二居然也在學這個...看不懂(倒03/06 20:30