## 2020年11月4日 星期三

### Herman Yeung YouTube 平台 5 歲啦

5年~我地個平台眨眼就5年
5年前的一個概念

5年間我同牛牛拍左

maths core, m1, m2, physics, chemistry, biology,
economics, BAFS, pure maths, additional maths,
maths and statistics, 中文口試...

5年間亦累積了 48,000 個 subscribers
4,000 萬 views 觀看次數

Herman Yeung

## 2020年10月29日 星期四

### 提升學習效率的方法

1. 一天開始時用15分鐘去計劃自己當日的時間

8點至9點又要食飯，11點訓
2:00 - 2:25 : 呢個時段做翻數學功課第1至5題
2:25 - 2:30 : hea ing ......
2:30 - 2:55 : 做埋果份數學功課的第 6 至10題
2:55 - 3:00 : hea ing ....
3:00 - 3:25 : 做英文功課
3:25 - 3:30 : hea ing ....
3:30 - 3:55 : 睇25分鐘YouTube Chem Chapter 1 的 第15 至20條 片
3:55 - 4:00 : hea ing....
4:00 - 4:25 : 睇多25分鐘 YouTube Maths 天書 A 的第72 至81 條片
...
plan 好每一個時段，您會清楚知道今天的工作是什麼

2. 善用中間的寧碎時間

3. 不要長期集中，要有放空的時間

Herman Yeung

## 2020年10月24日 星期六

### 同月同日生

(簡單少少︰假設無人 2月29日 生日)

(詳情可看以下圖片)
(數字答案為 (365! / 324!) / 365^41 係一個連計算機都禁唔到的答案。)

1 ~ 9 的出現頻率於非假數的系統中係有著一個好特別的分佈，

Herman Yeung ## 2020年10月15日 星期四

### 需求定律 (law of demand)、生產者物品 (producer goods)、消費者物品 (consumer goods) 和 水魚者物品 (water fish goods)

OK，咁我地講第二個例子

[消費者物品 (consumer goods) 係指您買呢件野係自己消費之用

1. 做到補習天王收入好高，令同學趨之若騖
2. 補習天王出埋聲話日後會請大量手下，令同學覺得入行機會高
3. (呢一步係佢地做得最自然) 教得好廢，令同學覺得佢咁廢都搵咁多
(吹個數的確係好多)，令同學覺得自己教得比佢教得好就想唔發都唔得。

Herman Yeung

## 2020年10月11日 星期日

### 過度理由效應

“細路阿細路，我老人家好鍾意熱鬧

(您無聽錯，我無打錯，佢係叫班細路嘈得大聲D)

(因為金錢的利益比娛樂價值更大)

Herman Yeung

### 一則 激X之X堂 的評論 令我花了一天時間執翻好個 blogger

[001主目錄 (1)、002其他目錄 (13)、中文 (3)、古文明 (10)、

BAFS 企會財 (24)、Biology 生物 (10)、Chemistry 化學 (2)、
Economics 經濟 (10)、English - newspaper cutting (35)、
Finance 財務 (16)、History 歷史 (2)、IQ題 (8)、Marketing市場學 (5)、
Mathematics 數學 (Core) (121)、Mathematics 數學 (M1) (11)、
Mathematics 數學 (M2) (10)、Past Paper Solution (5)、Paypal (1)、
Physics 物理 (2)、Pure Mathematics 純粹數學 (23)、Textbook (5)]

Herman Yeung

## 2020年10月9日 星期五

### 113400 的因數有多少個？

Step A : 2^2︰您可以抽 0, 1, 2 個 "2"
Step B : 3^1 : 您可以抽 0, 1 個 "3"

Step A 有 3 個選擇、Step B 有 2 個選擇，過關就係 (3x2) = 6 個組合

Step A :  2^3︰您可以抽 0, 1, 2, 3 個 "2"
Step B :  3^4︰您可以抽 0, 1, 2, 3, 4 個 "3"
Step C :  5^2︰您可以抽 0, 1, 2 個 "5"
Step D :  7^1︰您可以抽 0, 1 個 "7"

Step A 有 4 個選擇、Step B 有 5 個選擇，Step C 有 3 個選擇、Step D 有 2 個選擇，

2^0 * 3^0 * 5^0 * 7^0 = 1
2^1 * 3^0 * 5^0 * 7^0 = 2
2^2 * 3^0 * 5^0 * 7^0 = 4
2^3 * 3^0 * 5^0 * 7^0 = 8
2^0 * 3^1 * 5^0 * 7^0 = 3
2^1 * 3^1 * 5^0 * 7^0 = 6
2^2 * 3^1 * 5^0 * 7^0 = 12
2^3 * 3^1 * 5^0 * 7^0 = 24
2^0 * 3^2 * 5^0 * 7^0 = 9
2^1 * 3^2 * 5^0 * 7^0 = 18
2^2 * 3^2 * 5^0 * 7^0 = 36
2^3 * 3^2 * 5^0 * 7^0 = 72
2^0 * 3^3 * 5^0 * 7^0 = 27
2^1 * 3^3 * 5^0 * 7^0 = 54
2^2 * 3^3 * 5^0 * 7^0 = 108
2^3 * 3^3 * 5^0 * 7^0 = 216
2^0 * 3^4 * 5^0 * 7^0 = 81
2^1 * 3^4 * 5^0 * 7^0 = 162
2^2 * 3^4 * 5^0 * 7^0 = 324
2^3 * 3^4 * 5^0 * 7^0 = 648
2^0 * 3^0 * 5^1 * 7^0 = 5
2^1 * 3^0 * 5^1 * 7^0 = 10
2^2 * 3^0 * 5^1 * 7^0 = 20
2^3 * 3^0 * 5^1 * 7^0 = 40
2^0 * 3^1 * 5^1 * 7^0 = 15
2^1 * 3^1 * 5^1 * 7^0 = 30
2^2 * 3^1 * 5^1 * 7^0 = 60
2^3 * 3^1 * 5^1 * 7^0 = 120
2^0 * 3^2 * 5^1 * 7^0 = 45
2^1 * 3^2 * 5^1 * 7^0 = 90
2^2 * 3^2 * 5^1 * 7^0 = 180
2^3 * 3^2 * 5^1 * 7^0 = 360
2^0 * 3^3 * 5^1 * 7^0 = 135
2^1 * 3^3 * 5^1 * 7^0 = 270
2^2 * 3^3 * 5^1 * 7^0 = 540
2^3 * 3^3 * 5^1 * 7^0 = 1080
2^0 * 3^4 * 5^1 * 7^0 = 405
2^1 * 3^4 * 5^1 * 7^0 = 810
2^2 * 3^4 * 5^1 * 7^0 = 1620
2^3 * 3^4 * 5^1 * 7^0 = 3240
2^0 * 3^0 * 5^2 * 7^0 = 25
2^1 * 3^0 * 5^2 * 7^0 = 50
2^2 * 3^0 * 5^2 * 7^0 = 100
2^3 * 3^0 * 5^2 * 7^0 = 200
2^0 * 3^1 * 5^2 * 7^0 = 75
2^1 * 3^1 * 5^2 * 7^0 = 150
2^2 * 3^1 * 5^2 * 7^0 = 300
2^3 * 3^1 * 5^2 * 7^0 = 600
2^0 * 3^2 * 5^2 * 7^0 = 225
2^1 * 3^2 * 5^2 * 7^0 = 450
2^2 * 3^2 * 5^2 * 7^0 = 900
2^3 * 3^2 * 5^2 * 7^0 = 1800
2^0 * 3^3 * 5^2 * 7^0 = 675
2^1 * 3^3 * 5^2 * 7^0 = 1350
2^2 * 3^3 * 5^2 * 7^0 = 2700
2^3 * 3^3 * 5^2 * 7^0 = 5400
2^0 * 3^4 * 5^2 * 7^0 = 2025
2^1 * 3^4 * 5^2 * 7^0 = 4050
2^2 * 3^4 * 5^2 * 7^0 = 8100
2^3 * 3^4 * 5^2 * 7^0 = 16200
2^0 * 3^0 * 5^0 * 7^1 = 7
2^1 * 3^0 * 5^0 * 7^1 = 14
2^2 * 3^0 * 5^0 * 7^1 = 28
2^3 * 3^0 * 5^0 * 7^1 = 56
2^0 * 3^1 * 5^0 * 7^1 = 21
2^1 * 3^1 * 5^0 * 7^1 = 42
2^2 * 3^1 * 5^0 * 7^1 = 84
2^3 * 3^1 * 5^0 * 7^1 = 168
2^0 * 3^2 * 5^0 * 7^1 = 63
2^1 * 3^2 * 5^0 * 7^1 = 126
2^2 * 3^2 * 5^0 * 7^1 = 252
2^3 * 3^2 * 5^0 * 7^1 = 504
2^0 * 3^3 * 5^0 * 7^1 = 189
2^1 * 3^3 * 5^0 * 7^1 = 378
2^2 * 3^3 * 5^0 * 7^1 = 756
2^3 * 3^3 * 5^0 * 7^1 = 1512
2^0 * 3^4 * 5^0 * 7^1 = 567
2^1 * 3^4 * 5^0 * 7^1 = 1134
2^2 * 3^4 * 5^0 * 7^1 = 2268
2^3 * 3^4 * 5^0 * 7^1 = 4536
2^0 * 3^0 * 5^1 * 7^1 = 35
2^1 * 3^0 * 5^1 * 7^1 = 70
2^2 * 3^0 * 5^1 * 7^1 = 140
2^3 * 3^0 * 5^1 * 7^1 = 280
2^0 * 3^1 * 5^1 * 7^1 = 105
2^1 * 3^1 * 5^1 * 7^1 = 210
2^2 * 3^1 * 5^1 * 7^1 = 420
2^3 * 3^1 * 5^1 * 7^1 = 840
2^0 * 3^2 * 5^1 * 7^1 = 315
2^1 * 3^2 * 5^1 * 7^1 = 630
2^2 * 3^2 * 5^1 * 7^1 = 1260
2^3 * 3^2 * 5^1 * 7^1 = 2520
2^0 * 3^3 * 5^1 * 7^1 = 945
2^1 * 3^3 * 5^1 * 7^1 = 1890
2^2 * 3^3 * 5^1 * 7^1 = 3780
2^3 * 3^3 * 5^1 * 7^1 = 7560
2^0 * 3^4 * 5^1 * 7^1 = 2835
2^1 * 3^4 * 5^1 * 7^1 = 5670
2^2 * 3^4 * 5^1 * 7^1 = 11340
2^3 * 3^4 * 5^1 * 7^1 = 22680
2^0 * 3^0 * 5^2 * 7^1 = 175
2^1 * 3^0 * 5^2 * 7^1 = 350
2^2 * 3^0 * 5^2 * 7^1 = 700
2^3 * 3^0 * 5^2 * 7^1 = 1400
2^0 * 3^1 * 5^2 * 7^1 = 525
2^1 * 3^1 * 5^2 * 7^1 = 1050
2^2 * 3^1 * 5^2 * 7^1 = 2100
2^3 * 3^1 * 5^2 * 7^1 = 4200
2^0 * 3^2 * 5^2 * 7^1 = 1575
2^1 * 3^2 * 5^2 * 7^1 = 3150
2^2 * 3^2 * 5^2 * 7^1 = 6300
2^3 * 3^2 * 5^2 * 7^1 = 12600
2^0 * 3^3 * 5^2 * 7^1 = 4725
2^1 * 3^3 * 5^2 * 7^1 = 9450
2^2 * 3^3 * 5^2 * 7^1 = 18900
2^3 * 3^3 * 5^2 * 7^1 = 37800
2^0 * 3^4 * 5^2 * 7^1 = 14175
2^1 * 3^4 * 5^2 * 7^1 = 28350
2^2 * 3^4 * 5^2 * 7^1 = 56700
2^3 * 3^4 * 5^2 * 7^1 = 113400

Herman Yeung

## 2020年9月18日 星期五

### 生命簡史 古生物放置攻略 - 人類的進化

Genetic material is the material that transmits genetic information between parents and offspring.

Except for some viruses whose genetic material is RNA, the genetic material of other viruses and all organisms with a typical cell structure are DNA.

Evolution refers to the change of genetic traits in a population between generations, and traits refer to the performance of genetic material.  The essence of human evolution is the change of population genetic material,

Myllokunmingia is known to date as the highest vertebrate in the early stage of life on earth.  It has a skull and skeleton made of cartilage.

The discovery of Myllokunmingia has not only advanced the entire history of vertebrate evolution including humans by 50 million years, but also rewritten and perfected the theory of early vertebrate evolution.

Tiktaalik is the first fish to have a neck.  The strong ribs allow them to leave the water and allow them to have more freedom when hunting, whether on land or in shallow water.

The Tiktaalik has a structure that can support its own weight and breathe air on a hard ground.  This is a key change in the evolution of the skull, allowing our distant ancestors to adapt to life on land.

The Archaeothyris was larger in size, had strong jaws, and could expand larger than other early reptiles, and had larger canine teeth, indicating that they were carnivorous animals.

The Archaeothyris is the ancestor of all single how animals, including mammals.

The Megazostrodon looks exactly like a mouse, is the size of a weasel, and behaves like a weasel.  It is the earliest mammal.  It is a burrowing animal and hunts at night.

The Megazostrodon lives a burrowing life, has the same diaphragm as humans, and is considered to be the ancestor of humans.

The Piesiadapis is one of the earliest known genus of primate mammals and looks a bit like squirrels.  Plesiadapis still have claws, but they are very different from modern primates.  These animals have four claws, which cannot bend and are very inflexible.

Some believe that the discovery of Plesiadapis has brought new discoveries to the evolution of primates, but there are also opinions that the Plesiadapis-shaped groups and modern primates do not belong to the same team.

Australopithecus has been able to walk upright, use natural tools, and may live in groups, seek food together, and jointly prevent attacks from other raptors and beasts.

Australopithecus is considered to be the first stage of the transition from ape to man, and is the ancestor of the entire Homo genus.

Homo sapiens is the only existing species in the genus Homo sapiens.  The development and complexity of the brain may be conducive to social life in groups.  Living in groups is very conducive to obtaining prey, collecting food and communicating information in a collaborative manner, thus.

Homo sapiens are divided into early Homo sapiens and late Homo sapiens.  The physical characteristics of the late Homo sapiens have no obvious differences from modern people.  They can refine stone and bone tools, and know the arts such as painting and carving.