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證平行四邊形 (對邊相等)
Author:
W.L. Wong, Albert
GeoGebra
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圓的切線方程
盈利與虧蝕
撒针估算面积实验
折扣
百分數及其應用
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Is this a prism 4
正立方體
包絡線
二元线性规划的图解法(18.2 例4)
指数与一次函数结合的定积分的动态演示.许兴华数学
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Exponent
Real Numbers
General Quadrilateral
Upper and Lower Sum or Riemann Sum
Circumcircle or Circumscribed Circle