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轨迹20
Author:
万超杰
GeoGebra
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球體建築師
拼砌四邊形
兩位數加法
三位數除以一位數（二）
【案例】2013年安徽高考15题
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兩直線夾角101.11.21
Symmetric設計對稱圖案(兩條對稱軸)
固定三角形的條件−題4
ｃｉｒｃｌｅ ｓｅｇｍｅｎｔ３
巧克力包裝盒的夾角(三角形柱)
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Conic Sections
Algebra
Arithmetic Operations
Trapezoid
Quadratic Equations