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problem2（双曲线？）
Author:
nujiznaw
GeoGebra
New Resources
平行線的判定
斐波那契螺旋弧线（表格法-可动态调节）
盈利與虧蝕
直線的斜率：水平變化 & 鉛垂變化
活动三：应用性质
Discover Resources
垂足三角形
科博館的水畢氏三角
Copy of 閱讀鐘面及數字鐘（時和分）
Testing: addition
平面直角坐标系
Discover Topics
Area
Right Triangles
Histogram
Optimization Problems
Vectors 2D (Two-Dimensional)