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Protractor
Author:
Cheuk chi fu
GeoGebra
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龙形曲线-分形龙2
活动三：应用性质
第八周作业3
斐波那契螺旋弧线（表格法-可动态调节）
常见四边形是否是双心四边形
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挑战中考压轴题
volleyball throughing
trigonometry1
菱形
邊長與三角形（一） 的複本
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Function Graph
Line Segment
Integers
Diagrams
Orthocenter