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S12G4 長方形內夾正方形的周長問題
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学用数学
GeoGebra
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四邊形的特性
兩位數加法
四邉形 (四年級) 教師版
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
龍騰4_1-1課隨3
area
test04
線性規劃
（三）观察物体
Discover Topics
Solids or 3D Shapes
Symmetry
Means
Fractions
Pythagoras or Pythagorean Theorem