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兩圓內外公切線
Author:
梅
GeoGebra
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異分母分數減法
畫出對稱圖形
【案例】圆柱体内放置一个大球六个小球
判斷球體
兩位數除以一位數（一）
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車輪車輪
八年级奥数之双曲线
repetitive squares by excel
利用海龟来趣味演示三角形三边的关系
莱诺三角形 Reuleaux Triangle及其特性
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Probability
Circle
Median Value
Rhombus
Parabola