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初犯九點圓
Author:
XIE Yuheng
Topic:
Geometry
九點圓
GeoGebra
New Resources
四邊形的特性
判斷球體
兩位數除以一位數（二）
第八周作业
直角坐標平面上的旋轉變換
Discover Resources
龍騰4習作
Quiz on Reflection 反射變換：測驗
ie 7
反射原理的副本
连续开方（制作：谢建华，修订：孟宝兴）
Discover Topics
Median Line
Geometric Transformations
Integral Calculus
LCM and GCD
Hyperbola