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用平方差公式做因式分解
Author:
鍾文欽
GeoGebra
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球体的体积推导
直線的斜率
画直线等分三角形的面积
第八周作业
多邊形的面積
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根據百分率找數量（二）: 例3
q5-10
圓冪：到兩點的內積
向量與坐標
解題四
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Quadratic Equations
Ratios
Special Points
Matrices
General Quadrilateral