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练习（点，斜率，直线）
Author:
朱亮
GeoGebra
New Resources
Untitled
Position Vector and Derivative Vector
Quadratic Equations: the Geometry of the Relationships Between the Coefficients and the Solutions
Identify Opposite, Adjacent, Hypotenuse
Proving Triangles Similar by Dilation
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Copie de Analemmas and Sun motion
Lightbulb investigation
Multiplication
testing1
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Constructions
Integral Calculus
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