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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
球体的体积推导（优化版）
算柱 (兩位數)
三位數除以一位數（二）
第八周作业
Discover Resources
excenter of triangle
Quiz on Centres of Triangles 三角形的中心：測驗
Apollonius Problem gergonne
拋物線(開口向上)
SolvingEquation_Ver3
Discover Topics
Median Value
Cuboid
Sine
Parallelogram
Power Functions