2 條F.4 Maths題 測驗用 20分,急!

2014-04-06 11:35 pm

回答 (4)

2014-04-07 1:12 am
✔ 最佳答案
Pleasr read:

圖片參考:https://s.yimg.com/rk/HA07992802/o/1737350757.jpg


2014-04-06 17:13:22 補充:
被快了一步......

2014-04-06 17:53:30 補充:
Q169
http://postimg.org/image/78vcjc4qr/
2014-04-07 1:28 am
http://i.na.cx/6Pa1t.jpg
Can you help me with this?
2014-04-07 1:25 am
Try put this equation in http://www.wolframalpha.com/
2014-04-07 1:24 am
哈哈哈,我被快了兩步添~

搬到意見欄啦~

2014-04-06 17:25:22 補充:
我的答案在此:

https://s.yimg.com/rk/HA00430218/o/527273871.png

2014-04-06 17:35:31 補充:
169.

First note that x³ + 5x² + 2x - 8 = (x - 1)(x + 2)(x + 4)

2x³ + 9x² + 4x - 15 = (2x + 5)(x - 1)(x + 3)


 x(x² - 16)    (x - 1)(x + 2)(x + 4)
------ ÷ ----------
(2x + 5)(x - 4)   (2x + 5)(x - 1)(x + 3)

2014-04-06 17:37:13 補充:
x(x + 4)(x - 4)   (x + 2)(x + 4)
------ ÷ -------
(2x + 5)(x - 4)   (2x + 5)(x + 3)


x(x + 4)(x - 4)   (2x + 5)(x + 3)
------ × -------
(2x + 5)(x - 4)   (x + 2)(x + 4)


x(x + 3)
----
(x + 2)


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