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vector sum
Author:
faanyat
GeoGebra
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常见四边形是否是双心四边形
正方形雪花图案
斐波那契螺旋弧线（表格法-可动态调节）
活动三：应用性质
直線的斜率：水平變化 & 鉛垂變化
Discover Resources
球面與截平面的關係
讀磅 (練習)
學資p.13第8題
探究平行四邊形面積(2)
Copy of 畢氏樹
Discover Topics
Parabola
Linear Programming or Linear Optimization
Piecewise Functions
Probability
Cosine