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救生員區域
Author:
張丰耘
GeoGebra
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拼砌四邊形
兩位數加法
【案例】圆柱体内放置一个大球六个小球
畫出對稱圖形
三位數除以一位數（二）
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排列組合
三角函數 Tan x 函數圖形
三角形外心的位置
Indices 5
模拟时钟
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Sequences and Series
Polygons
Quadrilaterals
Fractal Geometry
Step Functions