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SWC 4 centres in a triangle
Author:
hksiusir
GeoGebra
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百分數及其應用
直線的斜率：水平變化 & 鉛垂變化
平行線的判定
第八周作业2
盈利與虧蝕
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三下_三角形( 教師版)
hihi
concurrence of medians and bimedians of tetrahedron
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