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Author:kwwong

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拼砌四邊形
兩組對邊相等和有直角的四邊形
【案例】2018年全国1卷理科12题
異分母分數減法
兩位數加法

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螺旋線
硬幣
周考最后一题
Trigonometric Ratios of Any Angle
地球各緯度的晝長夜長

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Upper and Lower Sum or Riemann Sum
Mathematics
Addition
Quadratic Equations
Straight Lines

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