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折線1
Author:
chen mingchuan
GeoGebra
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拼砌四邊形
找出對稱軸
三位數除以一位數（一）
【案例】2018年全国1卷理科12题
兩位數加法
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橢圓軌跡
三個交點
gct-a01-jc095v2-27 三角形中線
F2 cylinder (r vs TSA)
双曲线的定义.许兴华数学
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Constructions
Cube
Solids or 3D Shapes
Fractal Geometry
Geometric Transformations