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红心
Author:
桂群成
GeoGebra
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【案例】2018年全国1卷理科12题
讀磅
双心四边形
圓周公式的應用
直線的斜率
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傅立葉級數
相同圖形的拼砌（有兩組平行線的四邊形）
Area
六年級
Copy of 梯形
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Perimeter
Exponent
Hypergeometric Distribution
Sequences and Series
Rhombus