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重心 內心 外心 垂心
Author:
26黃國修
GeoGebra
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GeoGebra笔记功能体验课件
兩位數除以一位數（一）
兩位數加法
球體建築師
柱體建築師
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台灣加油台灣加油
My second work
fixed arc length and fixed shaded area
I love Taiwan.(可縮放和移動)
两角和的正弦公式几何证明（改进）
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Statistical Characteristics
Linear Programming or Linear Optimization
Angles
Vectors
Similar Triangles