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圆锥曲线折纸操作题（教材案例）
Author:
蔡永志
Topic:
Conic Sections
,
Ellipse
,
Hyperbola
GeoGebra
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異分母分數減法
兩位數加法
画直线等分三角形的面积
兩組對邊相等的四邊形
第八周作业
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