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Author:
黃斌
GeoGebra
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常见四边形是否是双心四边形
第八周作业
球体的截面
第八周作业2
盈利與虧蝕
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y=ax²的圖形
中考压轴题大放送之十三
test
試作
sequence-circle
Discover Topics
Histogram
Geometry
Rotation
Differential Calculus
Planes