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fchengang
Author:
符成岗
GeoGebra
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盈利與虧蝕
常见四边形是否是双心四边形
撒针估算面积实验
双心四边形
第八周作业1
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畢氏定理
老師~這樣算另一種嗎??
GGB 基礎教學(平面幾何)
直線系
勾股定理
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Piecewise Functions
Orthocenter
Right Triangles
Numbers
Subtraction