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练习（点，斜率，直线）
Author:
朱亮
GeoGebra
New Resources
Curves
Introduction to Matrix Transformations
z`]]
Noisy loop
Bessel Function
Discover Resources
Log Stretch
การบวกเลขจำนวนเต็ม
translations/reflections
Copying an Angle
Mid Point Theorem
Discover Topics
Diagrams
Secant Line or Secant
Combinatorics
Parabola
Congruence