# Quod Erat Demonstrandum

## 2011/01/29

### 無聊因式分解

Filed under: Junior Form Mathematics — johnmayhk @ 6:41 下午
Tags:

liszenga 留言＂why there aren’t answer of factorization Quiz and worksheet!!＂

1.我 (more…)

## 2011/01/25

### [FW] Math is not linear

Filed under: Report — johnmayhk @ 9:57 下午

http://prezi.com/aww2hjfyil0u/math-is-not-linear/

## 2011/01/19

### [FW] Bending and Stretching Classroom Lessons to Make Math Inspire

Filed under: Fun,Report — johnmayhk @ 9:54 下午
Tags:

http://www.nytimes.com/2011/01/18/science/18prof.html?_r=2

## 2011/01/11

### [FW] Nature by Numbers

Filed under: Fun,Junior Form Mathematics — johnmayhk @ 12:17 下午

## 2011/01/09

### 無聊談：擬題

Filed under: mathematics — johnmayhk @ 10:38 上午
Tags:

If

$\frac{ac - b^2}{a - 2b + c} = \frac{bd - c^2}{b - 2c + d}$,

prove that

$\frac{ac - b^2}{a - 2b + c} = \frac{ad - bc}{a - b - c + d}$.

（驗算一下： (more…)

## 2011/01/08

### [FW] 寫教材負擔重

Filed under: Report — johnmayhk @ 6:33 下午

(細說新事 辛翠時)

(星島)2011年1月8日 星期六 06:30

http://hk.news.yahoo.com/article/110107/3/m4cw.html

## 2011/01/07

### Exercise in counting balls and boxes

Filed under: Additional / Applied Mathematics,HKALE,NSS — johnmayhk @ 7:43 上午
Tags:

The following is just a basic counting exercise from a secondary mathematics textbook (used in Taiwan, I guess), enjoy.

Find the number of ways of (more…)

## 2011/01/06

### 生成函數某應用

Filed under: Fun,mathematics — johnmayhk @ 6:10 下午

$5 = 1 + 1 + 1 + 1 + 1$
$5 = 1 + 1 + 1 + 2$
$5 = 1 + 1 + 3$
$5 = 1 + 2 + 2$
$5 = 1 + 4$
$5 = 2 + 3$
$5 = 5$

$5 = 2 + 1 + 2$

## 2011/01/05

### 簡單指數方程

Filed under: Junior Form Mathematics — johnmayhk @ 12:46 下午
Tags:

$a^x = a^{(2x - 1)}$

（所謂）答案：

$a^x = a^{(2x - 1)}$

$\Rightarrow x = 2x - 1$

$\Rightarrow x = 1$

## 2011/01/04

Filed under: Junior Form Mathematics — johnmayhk @ 9:22 上午

## 2011/01/02

### [FW][Movie] 博士の愛した数式

Filed under: Fun — johnmayhk @ 12:39 上午

## 2011/01/01

### A quadratic equation in cosx

Filed under: NSS — johnmayhk @ 4:04 下午
Tags:

$\sin^2x + \cos x + a = 0$