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y=sinx对称中心
Author:
张金伟
GeoGebra
New Resources
判斷球體
兩位數加法
異分母分數減法
球体的体积推导（优化版）
錐體建築師
Discover Resources
illusion 鏡射
線段與弧所構成封閉區域的填塞問題
tetrahedron rotational symmetric
探究判定全等三角形的条件（ASA）
拋物線2-焦點法
Discover Topics
Intersection
Surface
Quadratic Functions
Diagrams
Difference and Slope