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Author:
呂麗珠
GeoGebra
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異分母分數減法
畫出對稱圖形
兩位數除以一位數（二）
近似值：有效數字
sanjiaohanshu
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包絡線2
gjh-h04-01 多個堆疊的直角三角形
直線垂直平面的條件
[洋葱] 与相似有关的动点问题-上(0051)
平行四边形个数
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Hypergeometric Distribution
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Integral Calculus
Quadrilaterals
Trigonometry