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S1E2 jastrow illusion
Author:
学用数学
,
acchu
GeoGebra
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拼砌四邊形
【案例】2013年安徽高考15题
四邉形 (四年級) 教師版
球体的体积推导(优化版)
兩組對邊相等和有直角的四邊形
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horizontal
陳允杰 橢圓反射
同心六邊形
Completing the square(配方法)
基础知识
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Median Line
Line Segment
Congruence
Root
Tangent Line or Tangent