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任务10：黄金螺线与向日葵
Author:
陈丽婷
GeoGebra
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拼砌四邊形
異分母分數減法
兩位數除以一位數（一）
GeoGebra笔记功能体验课件
判斷球體
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convolution_demo1
彈幕模擬
Angle at centre twice angle at circumference
折扣 例5的副本
图形的放大与缩小.许兴华数学
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Cuboid
Conic Sections
Tree Diagrams
Unit Circle
Standard Deviation