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几何模版：倍长中线法 cxy
Author:
夏雨
GeoGebra
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龙形曲线-分形龙
异形操场
常见四边形是否是双心四边形
双心四边形
第八周作业2
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Quiz on Polar Coordinates (2) 極坐標測驗2
move
外心的找法與特性
柱體的總表面面積
同底等高的三角形面积相等.许兴华数学
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Pyramid
Trigonometric Functions
Derivative
Statistics
Orthocenter