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Author:
Peng Yu
GeoGebra
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小数 的副本
拼砌四邊形
判斷球體
【案例】2018年全国1卷理科12题
異分母分數減法
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三條線上的三角形
Spotlight 探射燈
shuangquxian
两角和的正弦公式几何证明（改进）
繪畫長方形
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Reflection
Unit Circle
Logic
Sequences and Series
Addition