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fei liu
GeoGebra
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讀磅
漂亮的摇摆曲线
圓周公式的應用
空间中两直线的位置关系
球体的体积推导（优化版）
Discover Resources
垂足三角形
數學作圖
正三角形的面積
梯形堆垛
导数
Discover Topics
Hypothesis Testing
Root
Prism
Median Value
Similar Triangles