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橢圓1-同心圓法
Author:
15黃瀚霆
GeoGebra
New Resources
平行線的斜率
讀磅
多邊形的面積
球体的体积推导（优化版）
空间中两直线的位置关系
Discover Resources
方格紙上畫菱形3
scalar multiplication
线段的最值
CircleIII
雙曲線的幾何性質
Discover Topics
Variance
Division
Curve Sketching
Centroid or Barycenter
Differential Calculus