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定长线段在相交直线上滑动
Author:
冯伟冀
GeoGebra
New Resources
斐波那契螺旋弧线（表格法-可动态调节）
异形操场
比較五件物件的重量
双心四边形
第八周作业3
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click and Jump to up
平面截距式
向量座標
重心
正立方體展開
Discover Topics
Ellipse
Straight Lines
Integers
Surface
Means