向學生展示一個數的分數倍數的意義，並發現 a/b × c/d = (ac)/(bd)。
English version: http://www.geogebratube.org/material/show/id/18168
柯志明
香港教育局
- Target Group (Age)
- 11 – 14
- Language
- Chinese Traditional / 繁體中文
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