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椭圆的定义
Author:
梁航宇
GeoGebra
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兩組對邊相等和有直角的四邊形
異分母分數減法
第八周作业
兩組對邊相等的四邊形
兩位數除以一位數（二）
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一階導函數
拋物線上的弓形區域
齒輪作圖
圓與兩平行切線
乘法練習
Discover Topics
Set Theory
Tangent Function
Multiplication
Vectors 3D (Three-Dimensional)
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