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chen mingchuan
GeoGebra
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異分母分數減法
球体的体积推导
第八周作业
三位數除以一位數（一）
錐體建築師
Discover Resources
Newton
周界-平移法(教學練習一)
GGB10
圆之吻（Apollonius circles）
尺规作图得到黄金三角形和黄金矩形
Discover Topics
Unit Circle
Sine
Scalene Triangles
Rhombus
Piecewise Functions