[DSE 2019] 你地溫 數學 又溫成點呢? [3]

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19 Like 13 Dislike
2019-01-03 04:50:33
大陸文科人要識 Fourier Transform, 你話呢?

Note: BEng 可以當係 BA
高考文科數學卷都要Fourier Transform?

咪吹水好喎?
Bachelor of Engineering = BEng
Bachelor of Art = BA
讀MBA, MPAcc, MPA 就可以避過大陸考研數學的無窮級數課程
2019-01-03 04:51:51
BTW, 大陸高考唔同 HKEAA

大陸考試直接叫你 compute, 操熟題型 is OK
HKEAA 出卷出了名刁鑽, 唔操 past paper 死路一條
2019-01-03 04:54:52
A question from Google:

1. You have a triangle ABC where Angle ABC is 90 degree. Now I produce a perpendicular line from AC such that the shortest distance between angle ABC and line AC is 6cm. Given that the area of ABC is 10cm, show that this triangle does not exist.
2019-01-03 04:55:14
A question from Google:

1. You have a triangle ABC where Angle ABC is 90 degree. Now I produce a perpendicular line from AC such that the shortest distance between angle ABC and line AC is 6cm. Given that the area of ABC is 10cm^2, show that this triangle does not exist.
2019-01-03 08:43:07
A question from Google:

1. You have a triangle ABC where Angle ABC is 90 degree. Now I produce a perpendicular line from AC such that the shortest distance between angle ABC and line AC is 6cm. Given that the area of ABC is 10cm^2, show that this triangle does not exist.

點解你唔撚洗訓
2019-01-03 11:04:12
其實我已經block咗佢 好煩
2019-01-03 12:26:40
其實我已經block咗佢 好煩

幾年前已經block左啦
2019-01-03 13:52:51
Solve x > i
A more normal question:

Is 94^93 > 93^94? Explain briefly.
Answer:
Put x=93, we have:
(x+1)^x > x^(x+1)
(x+1)^x - x^(x+1) >0
divide both side by (x+1)^x/x^x, we have:
x^x - x^(2x+1)/(x+1)^x > x^x - x^(2x+1)/x^x = x^x -x^(x+1) >0
Which leads to contradiction that
x^x -x^(x+1) < 0 for all x>1

QED


Manipulation mistake

I mean the joint inequality:
0< x^x - x^(2x+1)/x^x< x^x - x^(2x+1)/(x+1)^x

Key point:

If

x^x - x^(2x+1)/x^x <0

Then since (x+1)^x/x^x must be positive, we have:

(x+1)^x < x^(x+1)

2019-01-04 11:18:31
Solve x > i

又係你

想 invent 一下清 concept 的題目

complex number嘅世界有inequality㗎咩?
2019-01-04 11:22:34
又係你

想 invent 一下清 concept 的題目

complex number嘅世界有inequality㗎咩?

你唔係開始懷疑自己呀嘛
2019-01-04 11:26:57
想 invent 一下清 concept 的題目

complex number嘅世界有inequality㗎咩?

你唔係開始懷疑自己呀嘛

我對complex number嘅認知好有限
但照道理就define唔到嘅
2019-01-04 11:57:39
2019-01-04 12:03:25

佢咪提左你
2019-01-04 12:05:28

Completing squares then use substitution
2019-01-04 13:47:42
https://www.instagram.com/p/BsLSiCkBtii/?utm_source=ig_share_sheet&igshid=1cqab2e685d7u

用taylor expension做first principle
2019-01-04 13:50:35
https://www.instagram.com/p/BsLSiCkBtii/?utm_source=ig_share_sheet&igshid=1cqab2e685d7u

用taylor expension做first principle

原來佢有ig tim
2019-01-04 13:56:59
https://www.instagram.com/p/BsLSiCkBtii/?utm_source=ig_share_sheet&igshid=1cqab2e685d7u

用taylor expension做first principle

Series definition可以用limit definition鳩爆出嚟,唔一定要用D
反而係佢將無限個approach zero嘅term加埋就屈佢係零,呢句個presentation省略得離譜少少
呢度要用嗰啲唔知乜春convergence先做得到,但佢明顯避開咗嚟講,睇呢個post嘅學生又準備被教壞啦
2019-01-04 14:07:20
https://www.instagram.com/p/BsLSiCkBtii/?utm_source=ig_share_sheet&igshid=1cqab2e685d7u

用taylor expension做first principle

Series definition可以用limit definition鳩爆出嚟,唔一定要用D
反而係佢將無限個approach zero嘅term加埋就屈佢係零,呢句個presentation省略得離譜少少
呢度要用嗰啲唔知乜春convergence先做得到,但佢明顯避開咗嚟講,睇呢個post嘅學生又準備被教壞啦

2019-01-04 14:09:18
https://www.instagram.com/p/BsLSiCkBtii/?utm_source=ig_share_sheet&igshid=1cqab2e685d7u

用taylor expension做first principle

Series definition可以用limit definition鳩爆出嚟,唔一定要用D
反而係佢將無限個approach zero嘅term加埋就屈佢係零,呢句個presentation省略得離譜少少
呢度要用嗰啲唔知乜春convergence先做得到,但佢明顯避開咗嚟講,睇呢個post嘅學生又準備被教壞啦


2019-01-04 14:19:58
https://www.instagram.com/p/BsLSiCkBtii/?utm_source=ig_share_sheet&igshid=1cqab2e685d7u

用taylor expension做first principle

Series definition可以用limit definition鳩爆出嚟,唔一定要用D
反而係佢將無限個approach zero嘅term加埋就屈佢係零,呢句個presentation省略得離譜少少
呢度要用嗰啲唔知乜春convergence先做得到,但佢明顯避開咗嚟講,睇呢個post嘅學生又準備被教壞啦

唔係點叫生埃
2019-01-04 14:23:57
Series definition可以用limit definition鳩爆出嚟,唔一定要用D
反而係佢將無限個approach zero嘅term加埋就屈佢係零,呢句個presentation省略得離譜少少
呢度要用嗰啲唔知乜春convergence先做得到,但佢明顯避開咗嚟講,睇呢個post嘅學生又準備被教壞啦



考評局要你記呢個結果就係為咗避開啲convergence問題呀嘛
2019-01-04 14:40:33


考評局要你記呢個結果就係為咗避開啲convergence問題呀嘛

2019-01-04 14:42:58
https://www.instagram.com/p/BsLSiCkBtii/?utm_source=ig_share_sheet&igshid=1cqab2e685d7u

用taylor expension做first principle

Series definition可以用limit definition鳩爆出嚟,唔一定要用D
反而係佢將無限個approach zero嘅term加埋就屈佢係零,呢句個presentation省略得離譜少少
呢度要用嗰啲唔知乜春convergence先做得到,但佢明顯避開咗嚟講,睇呢個post嘅學生又準備被教壞啦

你說出重點了
first principle 有個 n->inf
無限項又有個 n->inf
佢呢個做法好理所當然咁將兩個 limit 掉轉咗
2019-01-04 14:44:56
Series definition可以用limit definition鳩爆出嚟,唔一定要用D
反而係佢將無限個approach zero嘅term加埋就屈佢係零,呢句個presentation省略得離譜少少
呢度要用嗰啲唔知乜春convergence先做得到,但佢明顯避開咗嚟講,睇呢個post嘅學生又準備被教壞啦



2019-01-04 14:52:23



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