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Author:
luodeqin@keleshuxue.com
GeoGebra
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三位數除以一位數（一）
畫出對稱圖形
算柱 (兩位數)
錐體建築師
異分母分數減法
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會考小測試
扇形面積
面積 題目5
sin, cos, tan 圖像
椭圆的两条垂直切线的交点轨迹 蒙日圆
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Arithmetic Mean
Hypergeometric Distribution
Trigonometric Functions
Parallelogram
Similar Triangles