请问如何证明圆锥曲线中双曲线、抛物线、椭圆的光学性质? 知乎 Template




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sketch #3260 sorry to over comment on your blog .haha. I 'm just flnpiipg through your posts after finding you through the KCWC. Recently I had this huge urge to learn to sketch with black ink pens. This cloud drawing is exactly the thing that I feel the need to put on paper. : )


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tomski请问如何证明圆锥曲线中双曲线、抛物线、椭圆的光学性质? 知乎 coloring