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畢氏定理
Author:
趙國亨
GeoGebra
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三位數除以一位數（一）
漂亮的摇摆曲线
祖冲之的期望：内棋与外棋
【案例】2018年全国1卷理科12题
平行線的斜率
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指數與對數的親密接觸
Boxes
五複合正6面體
test04
三角形的四心－五線－內外二圓的副本
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Ratios
Square
Real Numbers
Conditional Probability
Combinatorics