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俄罗斯方块
Author:
孟宝兴
GeoGebra
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三位數除以一位數（二）
【案例】2018年全国1卷理科12题
拼砌四邊形
球体的体积推导（优化版）
判斷球體
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multiplication of complex number in unit circle
二次曲線的準線與焦點
翻轉方塊(單開)
P6 圓周01B
求兩斜線區域的差
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Tangent Function
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