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同心圓
Author:
許清惟
GeoGebra
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兩位數除以一位數（二）
異分母分數減法
兩組對邊相等和有直角的四邊形
錐體建築師
第八周作业
Discover Resources
Quiz on the N-th Term of a Sequence 數列的第n項：測驗
交錯弓形圓周角
六下_圓周(教師版)
Task 5: Regular Hexagon
題2
Discover Topics
Planes
Cylinder
Geometric Transformations
Perimeter
Rectangle