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圆扇形展开（解释面积公式）
Author:
朱亮
GeoGebra
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兩位數加法
【案例】2018年全国1卷理科12题
找出對稱軸
柱體建築師
第八周作业
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GGB報告
圓周
Template: 對稱03
拋物線2-焦點法
「相似三角形」任务3的副本
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Integral Calculus
Equations
Trigonometry
Linear Equations
Reflection