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百分數：買賣問題（Java 版）
Author:
Anthony OR 柯志明
HTML5版：
http://www.geogebratube.org/student/m64158
GeoGebra
New Resources
長方體平面投影 (Codex版)
直角坐標平面上的旋轉變換
Fibonacci Clock
兩組對邊相等的四邊形
四邊形的特性
Discover Resources
测试
semicircle
三角形內角和_2
gjc090c21內切圓的圓心
GGB4
Discover Topics
Frequency Distribution
Percentages
Power Functions
Angles
Pythagoras or Pythagorean Theorem