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测试 = =
Author:
lanyi
bakaRu帮忙看看…… 你可以随意移动A和B两个点，A1和B1会自动移动
GeoGebra
New Resources
兩組對邊相等和有直角的四邊形
Earth with coastline
找出對稱軸
畫出對稱圖形
四邊形的特性
Discover Resources
arccot 的導數
P.8.20_1
向外延伸的多邊形
二面角的夹角
中心投影、平行投影
Discover Topics
Scatter Plot
Tangent Function
Division
Bar Chart or Bar Graph
Natural Numbers