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Re: [請益] 關於一元二次方程式的公式解

[ CS_TEACHER ]11 留言, 推噓總分: +8

作者: coco100 - 發表於 2008/12/25 19:08(17年前)

7^F→coco100:這題我可沒盲點喔!!(先消毒.........)12/25 23:13

[請益] 關於一元二次方程式的公式解

[ CS_TEACHER ]57 留言, 推噓總分: +34

作者: DearBear0907 - 發表於 2008/12/25 17:32(17年前)

2^F推coco100:a<0 根本沒差只要b平方減4ac開的出來就好了12/25 17:55

3^F→coco100:ax^2+bx+c=0 定義x平方項係數是正的而已12/25 17:57

7^F推coco100:公式解跟√4a平方有什麼關係？？12/25 18:18

9^F推coco100:就算a<0 4a^2一定是正數開根號也是正數12/25 18:23

10^F→coco100:實際推導過的人應該不會說這樣的話才對XD12/25 18:24

12^F推coco100:√4a平方=|2a| 4a^2必定大於0 開出來也是大於012/25 18:27

14^F推coco100:a < 0 一樣沒差 ex:-x^2-4x-4=012/25 18:35

16^F推coco100:若a < 0 則|2a|還可以繼續開出來變成-2a 跟上面正負抵銷12/25 18:43

17^F→coco100:請nono把公式導清楚吧!! a<0絕對不影響公式完全沒差12/25 18:45

19^F推coco100:既然是相同方程式那a<0 跟沒差12/25 19:21

27^F推coco100:a < 0 一樣可以推導　編者擅自規定 a > 0 也不夠嚴謹12/25 23:48

29^F推coco100:學生只要舉出-x^2+4x-3=0一樣能推導就反駁編者了12/25 23:54

30^F→coco100:不要小看現在的國二生公式解規定a>0必定有學生會有疑問12/25 23:55

36^F推coco100:如果學生沒補習不是誤了學生嘛??12/26 00:00

38^F推coco100:參考書本來就不應該寫a>0 然後解得x的公式解12/26 00:03

39^F→coco100:後面有附當a<0時公式解依然成立不是自打嘴巴嘛~~12/26 00:03

40^F推coco100:a>0和a<0公式解都不變那何須要有a>0的前提12/26 00:06

48^F→coco100:a>0介紹一次 a<0也介紹一次是一樣結果何必增加學生負擔12/26 00:20

54^F推coco100:參考書只要說a<0以此類推就好了~~12/26 00:34

55^F→coco100:那D老師幹麼PO定義上有規定a必須為正數??12/26 00:56

[請益] 國小數學題 ~ 求平均速率

[ CS_TEACHER ]23 留言, 推噓總分: +15

作者: fenyu - 發表於 2008/12/20 20:57(17年前)

2^F推coco100:距離就設8和6的最小公倍數就好了12/20 22:36

[請益] 適合在外國唸書的小朋友的書籍

[ CS_TEACHER ]5 留言, 推噓總分: +3

作者: chinethsiang - 發表於 2008/12/18 19:50(17年前)

2^F推coco100:有注音符號的故事書12/18 20:54

[請益] 各位老師都有自編講義嗎?

[ CS_TEACHER ]13 留言, 推噓總分: +7

作者: BLACKBE - 發表於 2008/12/13 00:13(17年前)

5^F推coco100:編30頁就要編一個禮拜了!!12/13 00:25

[請益] 如何找補習班教師的職缺?

[ CS_TEACHER ]15 留言, 推噓總分: +5

作者: Glacier - 發表於 2008/12/11 21:59(17年前)

4^F推coco100:你想教哪一科??有經驗嗎??12/11 22:38

[心情] 想要請問大家有這樣的工作嗎？

[ CS_TEACHER ]6 留言, 推噓總分: +5

作者: yanne - 發表於 2008/12/11 02:13(17年前)

2^F推coco100:白天可以兼重考班的課不過前提是你要夠強12/11 09:45

[請益] 第一次在補習班任教

[ CS_TEACHER ]2 留言, 推噓總分: +1

作者: oookkla - 發表於 2008/12/11 00:11(17年前)

2^F→coco100:兼職是沒有勞健保的12/11 09:47

[請益] 我想當老師

[ CS_TEACHER ]18 留言, 推噓總分: +12

作者: su6vuau3 - 發表於 2008/12/10 22:00(17年前)

3^F推coco100:如果你很會教~~那就當然有資格啦!!12/10 22:35

[請益] 一題三角形的題目

[ CS_TEACHER ]94 留言, 推噓總分: +38

作者: AlanShore - 發表於 2008/12/02 23:25(17年前)

28^F推coco100:還需要想嗎??答案就是20√3沒錯呀!!第五冊第三章第三節12/03 00:07

32^F推coco100:16/16/28是鈍角三角形 P會在外面12/03 00:14

34^F→coco100:題目說△ABC內部一點P 只有銳角三角形才可以12/03 00:15

36^F→coco100:正三角形的外接圓會有最小值即r有最小值r=PA=PB=PC12/03 00:16

37^F→coco100:鈍角三角形內部找不到一點P使得PA=PB=PC 懂嗎??12/03 00:18

40^F→coco100:鈍角三角形要在外部才能找一點P使得r=PA=PB=PC12/03 00:19

42^F→coco100:要使得PA+PB+PC有最小值必須是PA=PB=PC12/03 00:20

46^F推coco100:題目不需要跟你說它是正三角形你要自己判斷12/03 00:23

49^F推coco100:簡單來說就是求正三角形的外接圓半徑12/03 00:30

57^F→coco100:請利用兩邊和大於第三邊可以證出銳角三角形的外接圓最小12/03 00:32

58^F→coco100:我沒誤會題目呀~~~12/03 00:33

61^F→coco100:內有一點P，如欲使AP+BP+CP為最小 <==這句話可以判斷12/03 00:34

62^F→coco100:AP=BP=CP=R外接圓半徑可以使AP+BP+CP有最小值12/03 00:35

63^F→coco100:其中銳角三角形的外接圓半徑是最小的12/03 00:35

64^F→coco100:銳角三角形中的正三角形可以讓AP+BP+CP為最小12/03 00:36

70^F推coco100:費瑪點應該不是國高中生教材有教過的東西吧~~12/03 00:39

76^F推coco100:先去睡覺了明天再看看有什麼欠思考遺漏的地方大家晚安12/03 00:44

93^F推coco100:所以這題沒有正確答案只能說大於30的最小值囉??12/03 13:01

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