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如何证明过椭圆焦点作两互相垂直的直线，交椭圆于4个点，用最小二乘法拟合这四个点，则拟合直线过定点 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. : )
sketch 2862 Grumpy Cat
sketch 5167
sketch 3362 The Boss by David Torre
sketch 2904 Pinky and the Brain by Tim Poole
sketch 2055 Flower
sketch 5415
sketch 4161

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sketch 4273
sketch 3626 Skream by Wellen Lima
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sketch 4582 Pikachu by Mariana Sanchez Acevedo
sketch 1503 L 'Algérie
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sketch 839
sketch 5061





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