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黃斌
GeoGebra
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科赫雪花
椭圆内切圆链
GeoGebra数学资源(4-8年级)
龙形曲线-分形龙
中华人民共和国国旗
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三角函數
雙曲線20160521
兩面角
數學傳播39卷4期, 平面幾何公式思考
餘弦函數圖形
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Sine
Area
LCM and GCD
Linear Equations
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