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混合运算
Author:
chy198
GeoGebra
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畫出對稱圖形
錐體建築師
第八周作业
近似值：有效數字
柱體建築師
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圓周角的度數
area
菱形
圓周角與圓心角之度數關係臆測（圓心在圓周角的內部）
规律点问题的动态演示-案例一
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Vectors 2D (Two-Dimensional)
Trapezoid
Mode
Reflection
Rectangle