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椭圆第一定义
Author:
wangyiyao
Topic:
Conic Sections
,
Ellipse
GeoGebra
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算柱 (兩位數)
異分母分數減法
四邉形 (四年級) 教師版
判斷球體
四邊形的特性
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angle between lines
數值滑桿
分段移動
滑桿按鈕輸入框
均分除法（整數÷整數）的副本
Discover Topics
Rectangle
Arithmetic Operations
Terms
General Quadrilateral
Means