如何用纯几何法证明共焦点椭圆、双曲线的这一光学性质？ 知乎 Sketch Coloring Page

如何用纯几何法证明共焦点椭圆、双曲线的这一光学性质？ 知乎 Template

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Take a peek at some of the sketches created by our users, are you a sketchite?

sketch #4429 Spongebob by Brenda Peña

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sketch #4429 Spongebob by Brenda Peña

sketch #3383

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sketch #3383

sketch #5129 Konata Izumi by Urs Stefan

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anonymous
sketch #5129 Konata Izumi by Urs Stefan

sketch #20840 Dog by Laur Ūūtiis

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anonymous
sketch #20840 Dog by Laur Ūūtiis

sketch #280

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sketch #280

sketch #4869 Madara by Jean-Benoit Renaud

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sketch #4869 Madara by Jean-Benoit Renaud

sketch #5259

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anonymous
sketch #5259

sketch #5287

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anonymous
sketch #5287

sketch #1253

anonymous

anonymous
sketch #1253

sketch #5094 Squirrel by Mehdi Público

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sketch #5094 Squirrel by Mehdi Público

sketch #4589

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anonymous
sketch #4589

sketch #2035 Ernest Hemingway...
chayrolfrypan

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sketch #2035 Ernest Hemingway... chayrolfrypan

sketch #5115

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anonymous
sketch #5115

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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anonymous
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 #4368

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anonymous
sketch #4368

sketch #2017 HEYOO

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anonymous
sketch #2017 HEYOO

sketch #4852

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sketch #4852

sketch #286 sun

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anonymous
sketch #286 sun

sketch #5067

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anonymous
sketch #5067

sketch #687 Buddha Peace

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anonymous
sketch #687 Buddha Peace

sketch #3892

Rachel Christa Ibarrientos
sketch #3892

sketch #2457 cool beans brother

sketchmaster
sketch #2457 cool beans brother

sketch #4874 Milla Jovovich by Kimmy Kitty Perry Priemus

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anonymous
sketch #4874 Milla Jovovich by Kimmy Kitty Perry Priemus

sketch #2464 Spongebob by sketchmaster

sketchmaster
sketch #2464 Spongebob by sketchmaster

sketch #3659 Portrait by Mari Falcsik

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sketch #3659 Portrait by Mari Falcsik

sketch #4160

Hank Henry Armstrong
sketch #4160

sketch #3232

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sketch #3232

sketch #5189

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anonymous
sketch #5189

sketch #2477 hhhh

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anonymous
sketch #2477 hhhh

sketch #5091 The Red Lady by অনন্ত জলিল

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anonymous
sketch #5091 The Red Lady by অনন্ত জলিল

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