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陳隆期
GeoGebra
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【案例】2013年安徽高考15题
拼砌四邊形
兩位數除以一位數(一)
四邉形 (四年級) 教師版
兩組對邊相等和有直角的四邊形
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擺線
Transit of Venus - Pentagram
volume
S2 Chapter11.2 選擇適當的三角比
球表面积的一种特殊推导
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LCM and GCD
Trapezoid
Secant Line or Secant
Equilateral Triangles
Similarity Transformation or Similarity