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wang3213
GeoGebra
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折扣
撒针估算面积实验
平行線的判定
盈利與虧蝕
中华人民共和国国旗
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前景圖、背景圖
挑战中考压轴题1.1.3
Homework2
S5 2D Trigonometry
數軸
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Interest Calculation
Real Numbers
Sphere
Numbers
Reflection