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椭圆的聚光（升级版）
Author:
东海1号
Topic:
Ellipse
GeoGebra
New Resources
近似值：有效數字
四邊形的特性
算柱 (兩位數)
Nested spiral octagon
四邉形 (四年級) 教師版
Discover Resources
Q5-7
正立方體反射面
graph of functions
認識菱形的特徵
可拖动A、B 改变形状
Discover Topics
Reflection
Standard Deviation
Geometric Distribution
Root
Dilation