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Percentage
Author:
harryau
Explain the usage of percentage.
GeoGebra
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兩組對邊相等和有直角的四邊形
拼砌四邊形
球體建築師
兩位數除以一位數（二）
四邊形的特性
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二元一次聯立方程式圖解
三角形三邊長
circle
頂點法
Cycloid
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Power Functions
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