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六上练习：时钟轨迹问题
Author:
肖昆明
GeoGebra
New Resources
科氏力 (Coriolis Force)
科赫雪花
撒针估算面积实验
双心四边形
盈利與虧蝕
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数轴上的整数加法
B3C2-2例6-1
test
閱讀鐘面及數字鐘（時和分）的副本
两圆的位置关系
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Scalene Triangles
Trapezoid
Complex Numbers
Polynomial Functions
Trigonometry