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梯形面積(求上底)
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lkkbmaths teachers 檔案儲存用
GeoGebra
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兩組對邊相等和有直角的四邊形
拼砌四邊形
找出對稱軸
三位數除以一位數（二）
畫出對稱圖形
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angle between planes
畢式定理 (13)
平面外積、有向面積、二階行列式
Ladder on Wall
勾股定理的直观证明（义务教育数学 新课标-例82）
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Cylinder
Terms
Random Variables
Numbers
Arithmetic