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旋轉正方形
Author:
33陳郁婷
GeoGebra
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異分母分數減法
兩位數加法
畫出對稱圖形
球体的体积推导（优化版）
球體建築師
Discover Resources
手表内部秒针结构示意
圖D
Transformation of Functions
第六次:20190412
算幾不等式
Discover Topics
Geometry
Quadrilaterals
Subtraction
Continuity
Expected Value