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椭圆的光学性质
Author:
孟宝兴
GeoGebra
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找出對稱軸
判斷球體
三位數除以一位數（二）
球体的体积推导
画直线等分三角形的面积
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因數的判別
三角形的四心－五線－內外二圓
Apollonius Problem 10 CCC poncelet
虎牙直播
椭球面
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Mode
Differential Equation
Exponent
Complex Numbers
Ratios