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一，二次函数
Author:
许春兰
GeoGebra
New Resources
中华人民共和国国旗
斐波那契螺旋弧线（表格法）
直線的斜率：水平變化 & 鉛垂變化
科氏力 (Coriolis Force)
异形操场
Discover Resources
区域面积
Circumcentre
ｔｅｓｔ
Copy of sin(x) 的函數圖形
球面截痕
Discover Topics
Parallelogram
Parabola
Inequalities
Curve Sketching
Histogram