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包絡線
Author:
hou yi ting
孢落限
GeoGebra
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New Resources
兩組對邊相等的四邊形
四邉形 (四年級) 教師版
兩組對邊相等和有直角的四邊形
四邊形的特性
三位數除以一位數（一）
Discover Resources
雙曲線
腳踏車痕模擬
線段比較大小-01
图形动画3
翰林數學_2下_CH3-4_大角對大邊
Discover Topics
Centroid or Barycenter
Means
Sine
Division
Distributions