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面積：從梯形到三角形 02
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GeoGebra
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直角坐標平面上的旋轉變換
兩組對邊相等的四邊形
第八周作业
【案例】2013年安徽高考15题
異分母分數減法
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final report
圓錐曲線
SIN繪圖
三角形的三个旁切圆.许兴华数学
Quiz on Addition and Subtraction of Directed Numbers (2)
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Differential Calculus
Rectangle
Distributions
Exponential Functions
Division