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银币
Author:
luodeqin@keleshuxue.com
GeoGebra
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【案例】2013年安徽高考15题
柱體建築師
兩組對邊相等的四邊形
異分母分數減法
拼砌四邊形
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小二、小三_時間（教師版）
畢氏定理動態證明(劉徽)
Proof35 高士哲
动圆在定圆上滚动
正方体展开图的副本
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Isosceles Triangles
Normal Distribution
Continuity
Ratios
Planes