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三角形內角和為180度
Author:
范欣茹
GeoGebra
New Resources
柱體建築師
異分母分數減法
【案例】圆柱体内放置一个大球六个小球
三位數除以一位數（二）
兩組對邊相等的四邊形
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Lesson 2 HW
Copy of 方格紙上畫四邊形
中位线的副本
堆疊正立方體的副本
勾股定理III 基於歐基里德(Euclid)的證明
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Area
Numbers
Plane Figures or Shapes
Linear Regression
Function Graph