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三角形内角和，演示
Author:
dx
三角形内角和，演示
GeoGebra
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球体的体积推导
球体的体积推导（优化版）
四邊形的特性
找出對稱軸
四邉形 (四年級) 教師版
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製作組織圖
Locus of mid-point of a variable chord of a circle.
(007)80201辛宇婕
test
百變糖果棒
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Quadratic Equations
Mode
Arithmetic
Curve Sketching
Reflection