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作者 thisday 在 PTT 全部看板的留言(推文), 共3832則
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2F推:南市東縣嘉縣市高縣市)國中數學科試題 是這個嗎10/10 00:17
4F推:z + 2z^2 + 3z^3 +... +18z^18 這一串乘上Z 再相減10/10 00:36
5F→:29.10/10 16:49
22F推:chengweirh應該是想說三次或是四次吧XD10/10 00:31
23F→:tai520pei每個禮拜固定會吃12次XD10/10 00:31
33F推:300塊我有 不代表我只有300塊呀XD10/10 15:25
1F推:代數幾何?!10/08 23:08
1F推:z^7-1=0 的根有 1,w,w^2,w^3,w^4,w^5,w^610/08 12:10
2F→:1+z+..+z^6=0 的根有w,w^2,w^3,w^4,w^5,w^610/08 12:11
3F→:其中 w=e^(2kπ/7) ; k=1,2,3,4,5,610/08 12:13
4F→:k=0 w就是110/08 12:13
5F→:你可以在複數平面上畫個單位圓 把w標上去10/08 12:14
6F→:如果七個點都標上去的話 就成了一個正七邊型10/08 12:15
22F推:^^10/08 12:50
1F推:這是用根與系數 令大T=t/110/08 10:22
2F→:所求是1/t 的三個根相加10/08 10:23
3F→:也就是T的三個根相加10/08 10:23
4F→:T的方程式為 T^3+2T^2-t-1=010/08 10:24
5F→:三根和 = -2/1 = -210/08 10:26
6F噓:nooldlinn10/06 23:51
11F推:喬丹10/06 19:51