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proof51 柯承志
Author:
郭亮偉
GeoGebra
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GeoGebra笔记功能体验课件
垂直線的斜率
兩位數除以一位數（二）
祖冲之的期望：内棋与外棋
多邊形的面積
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y=x²+a的圖形
圓柱體表面面積
線之極點定理 / pole of a line theorem
七巧板
单晨答重庆李琳
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Cube
Volume
Quadratic Equations
Isosceles Triangles
Congruence