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Tangent perpendicular to radius
Author:
Big Lee
GeoGebra
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異分母分數減法
兩組對邊相等和有直角的四邊形
三位數除以一位數（二）
四邉形 (四年級) 教師版
兩位數加法
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二次函數圖形的描繪
丹鳳車追趕題
p11-11
旋轉方塊
两个经典不等式
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Sequences and Series
Square
Random Experiments
Kite
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