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平行線的判定
常见四边形是否是双心四边形
第八周作业1
盈利與虧蝕
球体的截面
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Is this a prism 3
三角形重心軌跡(動點在三圓上)
[問題] 行列式 = 0 的機率
小數加減
平行四邊形堆朵
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Integers
Cone
Plane Figures or Shapes
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Subtraction