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欧拉线与三角形中心
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GeoGebra
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第八周作业2
盈利與虧蝕
第三周作业效果演示
圓的基本性質
三角函数 的副本
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Cactest
二次函數圖形與兩軸的交點
reflectional symmetry_6
Locus
弦的垂直線何時平分弦活動?
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LCM and GCD
Quadrilaterals
Rhombus
Derivative
General Quadrilateral