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椭圆画法2定义法
Author:
冯伟冀
GeoGebra
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【案例】2018年全国1卷理科12题
球体的体积推导（优化版）
柱體建築師
四邉形 (四年級) 教師版
兩位數加法
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分數除法2: p/q ÷ b（均分）
自動調整切割數的積分
How to draw a square with ruler and compasses?
電工機械及基本電學圖解
全等三角形
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Quadrilaterals
Hypothesis Testing
Hyperbola
Cylinder
Area