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Perpendicular lines

Author:Ng KC

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画直线等分三角形的面积
球體建築師
兩組對邊相等和有直角的四邊形
【案例】2013年安徽高考15题
找出對稱軸

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橢圓軌跡 (4)
車線.ggb
sinx & cscx
聯立方程式
分數乘法列式練習

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Reflection
Plane Figures or Shapes
Exponent
Sine
Fractal Geometry

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