中三~中四數學, 高手請入!

👨🏻‍🏫 學術台數學

lam

2010-04-18 6:42 am

Maxima and Minima of Quadratic Functions
↑呢樣野... 我依家先中二, 唔識呀~ 但我要起補習社做呢d
e.g.
http://i477.photobucket.com/albums/rr136/lamszehon/K1.jpg
↑呢個係e.g.
http://i477.photobucket.com/albums/rr136/lamszehon/K2.jpg
↑我照住e.g.做都唔岩&仲係要唔識做, 完全唔明

http://i477.photobucket.com/albums/rr136/lamszehon/K3.jpg
↑呢個仲勁, 唔明佢up麥, 又冇e.g., 正係得格仔... 識鬼做咩?

其實做呢d有咩祕訣架??
我依家先中二...
完全唔明囉~
你地正係教我就得,
我唔要答案....
or你地可以用上面果3個e.g.黎教下我

更新1:

唔識呀.... 希望你地教下我啦TOT

更新2:

其實..... 直線方程, 二元一次咩咩咩, 因式分解進楷, 「不是」定理, remainder theorem, 「D=b^2-4bc」(唔記得叫咩名), 「-b『正負』開方b^2-4bc over 2」(唔記得叫咩名)..... 已經.... 學左.... 依家仲差Maxima and Minima of Quadratic Functions 咁就ok架啦>

更新3:

to chung2425: 我都唔想架啦~ 但補習社要我學呢堆野... 而且我唔可以唔補... 我唔想成績愈黎愈差(其實自己都唔想補), 總之依家都好大壓力下....

回答 (5)

[匿名]

2010-04-20 5:52 am

✔ 最佳答案

I've done all the above questions, as I'm also learning Kumon
Maybe I can solve K3 for you first:
The axis of symmetry is x=a
a=2
(i)When a< 0
(ii)When a <= 0 < 2
the minimum is f(1)
I can't explain it on here, but if you like, you can add me MSN:[email protected]
P.S.I'm only form 1 >_<

2010-04-19 21:53:29 補充：
I'm now learning K170

👍 0 👎 0

用戶19657

2010-04-19 7:50 am

K1
'.'1. cal the value of a by putting both same value of different x so that we can set up equations
egK1
'.' 0<=x<=4
.'. you can choose 0 and 4 to put into the f(x)
then f()=f()
then a is calculated
when you calculated the a, that is the min/max value of x of the parabola

👍 0 👎 0

wqe

2010-04-19 2:53 am

任事系一步一步來,你而家睇好難,但你一步一步讀上去,你可能睇書就識唔洗老師教都唔定

而家你應該有學在坐標圖上畫直線方程,但如果個方程有2次方,就會畫出曲線圖,好似上面D圖咁,2次方程的曲線圖又稱拋物線,拋物線一定有對稱軸同最大值或最小值,D格仔就系填對稱軸

其實你唔洗咁快學住,如果你想學多D野,我建議可以學左中3的野先,呢D系中4的野

👍 0 👎 0

Mosquitopang

2010-04-18 7:54 am

我保證呢個同你個syllabus係絕對唔同

👍 0 👎 0

Ray

2010-04-18 7:09 am

中二做中四野,超左兩個學年都幾好...

不過呢d已經out晒c,只好等另外既高手幫你啦..

2010-04-18 09:35:38 補充：
06年CE都轉晒制,好多野都out左c啦

2010-04-18 19:21:51 補充：
re:
chung2425

佢公文式超左兩個學年,所以冇得佢唔做架

👍 0 👎 0

收錄日期: 2021-04-23 20:26:13
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20100417000051KK01763

檢視 Wayback Machine 備份