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例2 22.5 67.5
Author:
谢鹏
GeoGebra
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兩組對邊相等的四邊形
球体的体积推导（优化版）
三位數除以一位數（二）
畫出對稱圖形
異分母分數減法
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【三角函數】sinx的平移
Thm8.1
軌跡方程式-重心軌跡
微信公众号“sx880A8”第706期中非国旗（Central African Republic）
微信公众号“sx880A8”第733期吉布提国旗République de Djibouti
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General Quadrilateral
Differential Equation
Fractal Geometry
Sphere
Quadrilaterals