直觀上來理解，這是一個被包圍在單位邊長正方形內的凹函數，其弧長小於圍住它的正方形三邊的和3

來源: 萬斤油於 2023-11-20 14:20:06 [博客] [舊帖] [給我悄悄話] 本文已被閱讀：次

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