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开二定律
Author:
吴志敏
GeoGebra
New Resources
畫出對稱圖形
第八周作业
找出對稱軸
兩位數除以一位數（二）
球体的体积推导
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棋聖加油
Magnitude of cosine
用平方差公式做因式分解
面積比化為向量比
祖冲之的期望：内棋与外棋
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Means
Geometry
Quadrilaterals
Cylinder
Diagrams