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椭圆的中点弦的轨迹.许兴华数学
Author:
许兴华数学
Topic:
Conic Sections
GeoGebra
New Resources
判斷球體
兩組對邊相等的四邊形
【案例】圆柱体内放置一个大球六个小球
球体的体积推导
球体的体积推导（优化版）
Discover Resources
了解為何 d(lnx)/dx = 1/x
regular tetrahedron in a cube
太陽系的認識(問答)
第二次:20190110
兩直線的銳夾角
Discover Topics
Root
Confidence Interval
Isosceles Triangles
Centroid or Barycenter
Unit Circle