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六上：圆的面积公式推导
Author:
钟秀群
Topic:
Circle
GeoGebra
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四邊形的特性
算柱 (兩位數)
兩位數除以一位數（一）
GeoGebra笔记功能体验课件
球體建築師
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坐標幾何（中一）
欢度春节（灯笼）
轴对称
正三角形堆垛
垂心
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Geometric Distribution
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