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Author:陳伯宇

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直角坐標平面上的旋轉變換
小数的副本
【案例】2018年全国1卷理科12题
兩組對邊相等和有直角的四邊形
異分母分數減法

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九點圓
圓周_心算題03
圆面积应用
線性變換矩陣（二階）的副本
橢圓幾何性質,光學性質,生活應用

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Tangent Line or Tangent
Cuboid
Centroid or Barycenter
Poisson Distribution
Equilateral Triangles

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