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keith leung
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Tim Brzezinski
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兩組對邊相等的四邊形
兩位數加法
兩位數除以一位數（二）
拼砌四邊形
判斷球體
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二次函數：係數與圖形的變化
體積
冰淇淋
n-m9bch1-1-2b-二次函數及其圖形-07
正方体与球面的相交曲面
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Logic
Derivative
Symmetry
Division
Plane Figures or Shapes