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Author:
張立人
GeoGebra
New Resources
兩位數除以一位數（一）
祖冲之的期望：内棋与外棋
兩位數加法
漂亮的摇摆曲线
第八周作业
Discover Resources
俄羅斯方塊
ppppp
三角形面積(由面積求高)
圓與切線
示例2
Discover Topics
Arithmetic Mean
Cylinder
Secant Line or Secant
Triangles
Cosine