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正四面體
Author:
lamanleung
GeoGebra
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兩位數除以一位數（二）
兩位數加法
sanjiaohanshu
【案例】2018年全国1卷理科12题
兩組對邊相等和有直角的四邊形
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線性組合3：正方形
拋物線與直線相交弓形區域
旋轉對稱
橢圓摺紙
二倍角的正切公式的证明
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Indefinite Integral
Solids or 3D Shapes
Rectangle
Trapezoid
Constructions