分母有理化 | Rationalization of Denominators
影片內容：
00:05 – 點解要有理化分母? | why rationalization of denominator?
01:54 – 基本概念 | basic idea
03:57 – 例子 1 | example 1
05:05 – 例子 2 | example 2
00:05 – 點解要有理化分母? | why rationalization of denominator?
01:54 – 基本概念 | basic idea
03:57 – 例子 1 | example 1
05:05 – 例子 2 | example 2