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三角函數由來= =
Author:
陳柄何
GeoGebra
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兩位數除以一位數（一）
三位數除以一位數（二）
近似值：有效數字
兩位數除以一位數（二）
兩組對邊相等和有直角的四邊形
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waaachen
對稱
rabbit
fhft
七巧板
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Incircle or Inscribed Circle
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