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fchengang动画
Author:
符成岗
GeoGebra
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异形操场
第八周作业2
折扣
直線的斜率：水平變化 & 鉛垂變化
常见四边形是否是双心四边形
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Incentre
三角形內角和_2
Coffee Brewing Control Chart
圓冪：到兩點的內積
Copy of 分數加法
Discover Topics
Similar Triangles
Trigonometry
Means
Derivative
Linear Programming or Linear Optimization