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【案例】2018年全国1卷理科12题
兩組對邊相等的四邊形
球体的体积推导（优化版）
異分母分數減法
兩組對邊相等和有直角的四邊形
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Quiz on Quadratic Formula 二次公式：測驗
補角關係
qid_39321
平移指令
圓錐截痕
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Upper and Lower Sum or Riemann Sum
Sine
Dilation
Derivative
Sequences and Series