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GeoGebra
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异形操场
直線的斜率：水平變化 & 鉛垂變化
常见四边形是否是双心四边形
折扣
科赫雪花
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龍騰4_1-1課例3
圖三
afdsfsdfds
Ruler
三節棍
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Quadrilaterals
Ellipse
Pyramid
Addition
Integers