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用圆规画圆
Author:
董君
GeoGebra
New Resources
異分母分數減法
兩位數除以一位數（二）
兩位數加法
球體建築師
兩位數除以一位數（一）
Discover Resources
三角函數的精確值
三角形外心的軌跡
冪函數
面、面相交
二倍角的正切公式的证明
Discover Topics
Pythagoras or Pythagorean Theorem
Standard Deviation
Vectors 2D (Two-Dimensional)
Straight Lines
Optimization Problems