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GeoGebra
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盈利與虧蝕
第八周作业
圓的切線方程
百分數及其應用
中华人民共和国国旗
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三角形的四心－五線－內外二圓
梯形
DSE Circle-ACT01A Relationship between Chords and Centre of a Circle
边长可变的正三角形上莱洛转子的滚动
百分數、分數和小數互化
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Angles
Geometry
Cube
Orthocenter
Polynomial Functions