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三角形三边关系
Author:
许春兰
GeoGebra
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画直线等分三角形的面积
直線的斜率：水平變化 & 鉛垂變化
漂亮的摇摆曲线
平行線的斜率
斜率的值
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Area of Trapezium
三個函數的最小值的最大值
ex 6
Copy of 角平分線分點比例
方程001
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Ellipse
Percentages
Equations
Derivative
Fractions