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练习（点，斜率，直线）
Author:
朱亮
GeoGebra
New Resources
Triangle with 3 Right Angles
Reflection Across 2 Parallel Lines
apec
Reflection across a line
Equation of Locus - Parabola
Discover Resources
Finding the midpoint
terst
Ympyrankulmia
คิดเลขเร็ว
tarea de geogebra
Discover Topics
Pie Chart or Circle Chart
Distributions
Triangles
Perimeter
Sequences and Series