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定长线段在相交直线上滑动
Author:
冯伟冀
GeoGebra
New Resources
兩組對邊相等和有直角的四邊形
算柱 (兩位數)
異分母分數減法
拼砌四邊形
兩位數除以一位數（一）
Discover Resources
內切圓滾動更新
sierpinski carpet
外资知名
任意三角形兩不等圓v3
地球－完整球面
Discover Topics
Equations
Limits
Isosceles Triangles
Sphere
Inequalities