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lansesorry
GeoGebra
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科氏力 (Coriolis Force)
平行線的判定
第八周作业2
第八周作业3
常见四边形是否是双心四边形
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海龍公式與內切圓半徑
尺規作圖髒髒版
uguguhu
一个二次函数图像
放缩尺
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Orthocenter
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