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十二音符頻率比值 (未修訂)
Author:
davidhsu
GeoGebra
New Resources
盈利與虧蝕
活动三：应用性质
第八周作业1
斐波那契螺旋弧线（表格法-可动态调节）
平行線的判定
Discover Resources
中線定理(阿波羅尼奧斯)定理推廣二：向四邊形推廣
活動所需時間計算機 (24小時報時制)
Drag A or X
圓錐截橫
Copy of Quiz on Compass Bearings
Discover Topics
Square
Algebra
Arithmetic
LCM and GCD
Power Functions