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proof 64 潘研
Author:
郭亮偉
GeoGebra
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兩組對邊相等和有直角的四邊形
找出對稱軸
異分母分數減法
柱體建築師
球体的体积推导（优化版）
Discover Resources
歪斜線夾四面體
Rotational symmetry examples
star
畫圖用底圖(含輔助格線)
小单答重庆杨志友公共部分面积
Discover Topics
Dilation
Root
Cosine
Differential Equation
Ellipse