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Author:
makkei
GeoGebra
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三角函数 的副本
盈利與虧蝕
龙形曲线-分形龙2
平行線的判定
第八周作业
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可變大的圓桌
二次函數04
Problem1:(md+me+mf)/(ad+be+cf)=a
長方形
解三角形（１）
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Standard Deviation
Ellipse
Equations
Differential Equation
Subtraction