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trapezium
Author:
iedc
GeoGebra
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拼砌四邊形
異分母分數減法
兩位數除以一位數（二）
兩位數除以一位數（一）
兩組對邊相等和有直角的四邊形
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幾何原理
fhft
鑲嵌圖形-1
二元线性规划的图解法(习题5)
三角形的垂心（一）
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Parallelogram
Random Variables
Pie Chart or Circle Chart
Plane Figures or Shapes
Circle