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正n边形内的旋转三角形
Author:
arist
GeoGebra
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异形操场
第八周作业3
盈利與虧蝕
中华人民共和国国旗
斐波那契螺旋弧线（表格法-可动态调节）
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DSE Circle-ACT02B Angle at centre and circumference
Areas of squares and rectangles_Question A至E
Circle
反比例函数3456
平行四边形个数
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Trigonometry
Division
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Calculus
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