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陳隆期
GeoGebra
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常见四边形是否是双心四边形
折扣
龙形曲线-分形龙
第三周作业效果演示
平行線的判定
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waaachen
Equal chords cut off equal arcs in a circle
testing
與兩圓相切之圓心雙曲線軌跡
翰林數學_2下_CH3-4_三角形的邊長關係
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Quadrilaterals
Rotation
Inequalities
Area
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