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如何证明四边形的�长一定时，正方形面积最大？ 知乎 Template






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sketch 3042 Tobi by Mirnes Sinanovic
sketch 3572 Hate mondays by Malyi Link
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sketch 3656 Igor by Vincent Baudement
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sketch 4708 Katekyo Hitman Reborn by Mário JBudo

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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 2784
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sketch 2810 Lennon by El Harouati Nassera
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sketch 5189
sketch 378 Guess what flag? ɔılqndǝɹ ɥɔǝzϽ
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