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polygon(first upload)
Author:
mingyi
GeoGebra
New Resources
異分母分數減法
【案例】2018年全国1卷理科12题
三位數除以一位數（二）
兩組對邊相等的四邊形
第八周作业
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圓形的西洋棋盤
河內塔 (Tower of Hanoi)
等腰，角度关系
Locus: Equidistance From Two Parallel Lines
扇形面積
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Tangent Line or Tangent
Geometric Transformations
Prism
Kite
Addition