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二次函數及其圖像2
Author:
Chris Cheng
GeoGebra
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判斷球體
異分母分數減法
兩位數除以一位數（一）
【案例】2013年安徽高考15题
找出對稱軸
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Parallelogram 02
三角錐(旋轉，實體、透視)
perimeter of rectangle
均值不等式的一种几何证明.许兴华数学
Solving the equations in the form ax + b = cx + d (Grouping like terms)
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Median Line
Parallelogram
Constructions
Statistics
Vectors 2D (Two-Dimensional)