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内外弦图
Author:
叶明杰
GeoGebra
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【案例】2013年安徽高考15题
錐體建築師
柱體建築師
判斷球體
三位數除以一位數（二）
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遊戲
Angry Bird
test
圆锥曲线的第二定义的副本
剪紙問題
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Logarithm
Sphere
Similar Triangles
Scalene Triangles
Cube