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中点轨迹
Author:
DongHai Zhang
中点轨迹
GeoGebra
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兩位數加法
兩位數除以一位數（二）
異分母分數減法
第八周作业
找出對稱軸
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補角關係
Ex (SAS)
勝者即正義，可愛即正義～(可用Ctrl+滑鼠滾輪放大界面)
五形面體 序
數學繪圖
Discover Topics
Prism
Unit Circle
Curve Sketching
Definite Integral
Means