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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
四邊形的特性
畫出對稱圖形
Nested spiral octagon
算柱 (兩位數)
sanjiaohanshu
Discover Resources
弹簧变化
四邊形面積問題
Crayon shin-chan, Episode 1232, Cut
翰林數學_1下_CH4_一元一次不等式解的圖示法
翰林數學_2下_CH4-1_截線與截角的意義
Discover Topics
Isosceles Triangles
Median Value
Variance
Ellipse
Perimeter