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quadrilaterals 2
Author:
iedc
GeoGebra
New Resources
判斷球體
兩位數除以一位數（二）
三位數除以一位數（二）
画直线等分三角形的面积
異分母分數減法
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固定面積的圖形的周界變化
我的作法
rose
perimeter of rectangle
光的反射
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Centroid or Barycenter
Straight Lines
Angles
Percentages
Statistics