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三角形的内切圆与外接圆
Author:
夜雨嘀嗒
GeoGebra
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盈利與虧蝕
百分數及其應用
斐波那契螺旋弧线（表格法-可动态调节）
比較五件物件的重量
常见四边形是否是双心四边形
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TESTTT
三角形內接正方形
乘法
What's wrong
Sine Wave 3D
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Prism
Ellipse
LCM and GCD
Definite Integral
Rhombus