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winnie
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hwpctablet
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斜率的值
多邊形的面積
圓的切線方程
漂亮的摇摆曲线
空间中两直线的位置关系
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二次函數02
semops_圓柱
拼貼2
GGB4
Gazing Cow Problem (b)
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Set Theory
Continuity
Cube
Congruence
Angles