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六上练习：时钟轨迹问题
Author:
钟秀群
Topic:
Circle
GeoGebra
New Resources
長方體平面投影 (Codex版)
兩組對邊相等的四邊形
找出對稱軸
近似值：有效數字
畫出對稱圖形
Discover Resources
內切圓滾動
體積
Angle at centre twice angle at circumference
包含除法（1 ÷分數）的副本
我的第一个GGB绘本
Discover Topics
Arithmetic Mean
Normal Distribution
Limits
Step Functions
Ratios