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练习（点，斜率，直线）
Author:
朱亮
GeoGebra
New Resources
bewijs stelling van Pythagoras
Tetrahedron String Art
Linear Systems + Relationships Between Coefficients and Solutions
apec
GGB is Awesome!
Discover Resources
sin cos tan tl
rhombus
متوالية حسابية
Plotting Quadrilaterals: Part 2
Discover Topics
Geometric Transformations
Hypothesis Testing
Trigonometry
Linear Equations
Correlation