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橢圓的切線作圖
Author:
紀延平
GeoGebra
New Resources
判斷球體
球体的体积推导（优化版）
第八周作业
兩位數除以一位數（一）
找出對稱軸
Discover Resources
弦中點的軌跡
複合圖形(八)
Orthocentre
小球弹射
圆锥圆柱圆台的侧面展开图(及侧面上两点的最近曲线)
Discover Topics
Calculus
Quadratic Equations
Isosceles Triangles
Curve Sketching
Multiplication