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Author:
许业成
GeoGebra
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盈利與虧蝕
中华人民共和国国旗
球体的截面
镂空正方体案例对比
龙形曲线-分形龙
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分數乘法1
congruent (SA)
GGB10
绘本1-平面直角坐标系复习
圆锥截面为圆椭圆双曲线抛物线的动画显示.许兴华数学
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Integers
Circle
Coordinates
Quadratic Functions
Orthocenter