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S0G4L2 到两点距离的运算值为定值1：到两点距离和
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学用数学
GeoGebra
New Resources
拼砌四邊形
兩位數加法
兩組對邊相等的四邊形
兩組對邊相等和有直角的四邊形
三位數除以一位數（一）
Discover Resources
高中數學函數圖形
扇形概念與面積
Transit of Venus - Pentagram
F-10-2-poly3-gph-bac-1
二面角
Discover Topics
Arithmetic
Real Numbers
Congruence
Upper and Lower Sum or Riemann Sum
Tree Diagrams