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椭圆的光学性质
Author:
孟宝兴
GeoGebra
New Resources
球体的体积推导（优化版）
四邉形 (四年級) 教師版
三位數除以一位數（一）
拼砌四邊形
球體建築師
Discover Resources
鏡射
task 2
圓所形成的三角形
拋物線2-焦點法
表内乘法
Discover Topics
Quadratic Functions
Means
Conditional Probability
Numbers
Parametric Curves