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周界(1)
Author:
Kenneth Wong
GeoGebra
New Resources
百分數及其應用
常见四边形是否是双心四边形
正方形雪花图案
直線的斜率：水平變化 & 鉛垂變化
平行線的判定
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Lap / 9
max{f(x),g(x),s(x)} 與 min{f(x),g(x),s(x)}
等腰直角三角形
earth
二倍角的余弦公式的证明
Discover Topics
Curve Sketching
Constructions
Square
Ellipse
Upper and Lower Sum or Riemann Sum