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锐角三角函数的定义
Author:
王清华
制作：王清华
GeoGebra
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龙形曲线-分形龙
双心四边形
百分數及其應用
盈利與虧蝕
中华人民共和国国旗
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上圓下方的盒子
兩條數線比較
加減併式與估算
ikik
題6
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Ellipse
Set Theory
Surface
General Quadrilateral
Hypothesis Testing