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selection task 4
Author:
Arthur Lee
找出垂直線，把它們移到右邊。
GeoGebra
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Morse code visualizer / decoder
以竹簽拼砌三角形
Flip 9 Coins
Similar Solids
Golden Rectangles and Golden Spirals
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CCSS IP Math I 3.2.2 Example 3
Testing
Ceviene de Rang k 2.
Euler's Method
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Normal Distribution
Differential Calculus
Equilateral Triangles
Parallelogram
Means