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椭圆的定义
Author:
guomenglin
Topic:
Ellipse
GeoGebra
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算柱 (兩位數)
三位數除以一位數（一）
球體建築師
兩組對邊相等和有直角的四邊形
【案例】2018年全国1卷理科12题
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圓的性質
向日葵
凸透镜成像
gltzk 角錐的兩種展開圖
P.5 面積問題04
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Right Triangles
Scalene Triangles
Sequences and Series
Median Line
Distributions