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一元二次方程求根公式
Author:
梁航宇
GeoGebra
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平行線的判定
中华人民共和国国旗
折扣
比較五件物件的重量
异形操场
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黎曼和
Temp file
Copy of 平行四邊形的面積
解題二
Oscillations
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Fractal Geometry
Sine
Addition
Means
Integers