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Author:
鍾文欽
GeoGebra
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画直线等分三角形的面积
三位數除以一位數（一）
【案例】2013年安徽高考15题
柱體建築師
兩位數加法
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題九
二維點陣列變化
同位角__水平平行綫
a sin(bx+c) + d 的圖形的副本
Quiz on Solving One-step Linear Equations (1)
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Similar Triangles
Intersection
Conic Sections
Ellipse
Ratios