作者查詢 / FAlin
作者 FAlin 在 PTT [ Math ] 看板的留言(推文), 共293則
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2F推: 11=(100-1)/9 , n個1 = (10^n-1)/911/05 00:07
1F推:三面的654 15點共8個 兩面的65 11點共12個07/17 02:30
2F→:面中心 6點 6個 總共 15*8+11*12+6*6 = 28807/17 02:30
1F推:做角C的平分線交AD於E AD=√21 DE=2√21/705/31 04:53
2F→:三角形 EDC跟ADB相似 BD/AD = CD/DE05/31 04:54
3F→:BD / √21 = 2/(2√21/7) 可求出 BD = 705/31 04:55
4F→:BC = 7+2 = 905/31 04:55
5F→:當中用到角平分線跟邊長的關係 以及 相似形05/31 04:55
2F→:1 2 3 5 8 13 2105/07 21:24
1F推:C10取8的意義在哪裡 有想清楚嗎 ?05/06 17:23
2F→:先用你的算式算 (1+x)^3 跟 (1+x)(2+x)(3+x) 的x^205/06 17:24
3F→:找癥結點吧05/06 17:24
281F→:這題目老到爛掉了ˊ_>ˋ04/11 23:37
4F推:數學歸納法04/09 19:25
1F推:各方向的單位向量不就是了ˊ_>ˋ04/06 21:34
2F→:(1,0,0...0,0) (0,1,0...0,0) ... (0,0,0...0,1)04/06 21:35
4F→:∠QCR = ∠RPQ03/17 22:32