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中垂線
Author:
arist
GeoGebra
New Resources
兩組對邊相等的四邊形
兩組對邊相等和有直角的四邊形
兩位數加法
第八周作业
三位數除以一位數（一）
Discover Resources
畫蛇添福
vbcvbcvbcvbcvbcvcv
用星星來比較圖形的大小
test
纏繞畫
Discover Topics
Prism
Plane Figures or Shapes
Combinatorics
Upper and Lower Sum or Riemann Sum
Addition