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蝴蝶定理动态演示
Author:
weizhuli(卫珠礼)
GeoGebra
New Resources
拼砌四邊形
異分母分數減法
第八周作业
找出對稱軸
直角坐標平面上的旋轉變換
Discover Resources
fhft
底面為梯形的四角柱表面積
S6 3D Basic Concept
光的折射（光线自右下向左上）
Area
Discover Topics
Geometric Mean
Cylinder
Circle
Vectors
Mode