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作者 chuo 在 PTT [ Math ] 看板的留言(推文), 共185則

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Re: [中學] 直線與圓

[ Math ]4 留言, 推噓總分: +2

作者: chuo - 發表於 2011/04/29 01:06(15年前)

4^F→chuo:GH=GD-DH=a+1才對04/30 00:22

[中學] 請教一題圓心問題

[ Math ]4 留言, 推噓總分: +1

作者: iamOrz - 發表於 2011/04/28 20:03(15年前)

1^F推chuo:圓心會在PQ中垂線上:x=(k+2)/2 代回4x-2y-3=0 解出y04/28 20:20

2^F→chuo:過P點切線斜率1 所以圓心在過P點斜率-1的線上y=-x+k04/28 20:21

3^F→chuo:將剛剛算出的(x,y)代回y=-x+k即可04/28 20:21

[中學] 直線與圓

[ Math ]11 留言, 推噓總分: +4

作者: dayjay - 發表於 2011/04/28 18:52(15年前)

1^F推chuo:題目有出錯嗎感覺算出來無解@@04/28 19:22

2^F推chuo:呃 L1L2是交在X軸下面嗎? 我剛畫在上面算不出來04/28 19:24

3^F推chuo:我剛剛畫了把L1 L2交於X軸之下的圖也是無解...04/28 19:33

4^F→chuo:我的兩個畫法都是把a畫在-2與2之間= =04/28 19:34

5^F→chuo:看了一下答案發現根本不是這樣相切orz04/28 19:34

6^F→chuo:這種題目附個圖嘛XD 不附圖只靠文字有太多解法了orz04/28 19:35

7^F推chuo:我...算根號7耶囧我要放棄了可惡04/28 19:41

Re: [中學] 線段三等分

[ Math ]1 留言, 推噓總分: 0

作者: chuo - 發表於 2011/04/27 23:13(15年前)

1^F→chuo:不過學到重心性質之前...應該會先學平行吧?04/27 23:16

[中學] 機率問題

[ Math ]9 留言, 推噓總分: +1

作者: a01059942 - 發表於 2011/04/27 23:09(15年前)

1^F→chuo:1.C 48-48*(1-3/4)*(1*2/3)=4404/27 23:10

2^F→chuo:3.D 選到以r/3為半徑裡的小圓即可04/27 23:11

[中學] 線段三等分

[ Math ]7 留言, 推噓總分: +6

作者: jprnl - 發表於 2011/04/27 22:33(15年前)

3^F推chuo:不可能..04/27 23:07

4^F推chuo:看了一樓的推文好像可以囧04/27 23:09

[中學] 資優競賽題

[ Math ]7 留言, 推噓總分: +4

作者: love15 - 發表於 2011/04/22 13:52(15年前)

7^F推chuo:1.c?04/22 20:39

[中學] 國中資優數學有獎徵答

[ Math ]17 留言, 推噓總分: +6

作者: chuo - 發表於 2011/04/22 00:49(15年前)

11^F→chuo:昨天睡覺時想到第三題應該P只有一個解沒錯04/22 11:46

12^F→chuo:因為隨便把P畫出來會發現PAD+PBC=PAB+PCD解完公比r=104/22 11:47

13^F→chuo:另外請問G版友我不是國中生也不是要參加徵答@@04/22 12:12

14^F→chuo:只是想不太到問題想要請教大家應該可以吧囧04/22 12:12

17^F→chuo:了解了那我等過陣子再來討論04/22 16:03

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