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happy new year
Author:
李春培
happy new year
GeoGebra
New Resources
兩組對邊相等和有直角的四邊形
球體建築師
三位數除以一位數（二）
【案例】2013年安徽高考15题
画直线等分三角形的面积
Discover Resources
任務4
Contour Lines 等高線
正四角錐
moon
P.5 面積問題04
Discover Topics
Quadratic Equations
Functions
Histogram
Mode
Plane Figures or Shapes