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Number of solutions of two straight lines
Author:
Axel
GeoGebra
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祖冲之的期望：内棋与外棋
漂亮的摇摆曲线
圓的切線方程
圓周公式的應用
球体的体积推导（优化版）
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只跳躍一次的函數
固定面積的圖形周界變化
判斷球體 7
用平方差公式做因式分解
三視圖04
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Rational Numbers
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Confidence Interval