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六上练习：时钟轨迹问题
Author:
钟秀群
Topic:
Circle
GeoGebra
New Resources
球體建築師
異分母分數減法
兩位數除以一位數（一）
兩組對邊相等和有直角的四邊形
柱體建築師
Discover Resources
分數除法3: a ÷ b （包含）
Angle at Centre & Angle at Circumference: Proof 圓心角與圓周角：証明
擴分和約分
P3 平行與垂直01 測試
operations of matrix 2rd ver
Discover Topics
Kite
Incircle or Inscribed Circle
Arithmetic Mean
Functions
Subtraction