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ghseh 二次函數描點法頂點式-1
Author:
均一
GeoGebra
New Resources
兩組對邊相等和有直角的四邊形
柱體建築師
四邊形的特性
球体的体积推导（优化版）
畫出對稱圖形
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北區模考多選第八題 (2014.03.06)
IMO2014C
sinα + sinβ > 0 ?
递推关系具有分支选项的递推数列
選擇合適的「單位」
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Histogram
Interest Calculation
Trapezium
Symmetry
Calculus