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-1 ≤ cosA cosB cosC ≤ 1/8
Author:
羅驥韡 (Pegasus Roe)
GeoGebra
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四邉形 (四年級) 教師版
球體建築師
【案例】2013年安徽高考15题
三位數除以一位數（二）
找出對稱軸
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CircleRoundCircle
二次函數圖形(1)
rotational symmetry_1
雙曲線1-焦點法
微信公众号“sx880A8”第253期印度尼西亚国旗（Indonesia flag）
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Right Triangles
Similarity Transformation or Similarity
Angles
Dilation
Kite