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Author:
Tsai, Dung Jung
GeoGebra
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常见四边形是否是双心四边形
第八周作业2
盈利與虧蝕
活动三：应用性质
斐波那契螺旋弧线（表格法-可动态调节）
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橢圓的軌跡
旋轉對稱_1_李樂雯
旁心三角形的九點圓
test
五複合正6面體
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Translation
Polygons
Right Triangles
Area
Sequences and Series