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是这样“伪装”吗? $$6M\geqslant \abs{f(-1)}+3\abs{f(1)}+2\abs{f(2)}=\abs{-a+b-1}+\abs{-3a-3b-3}+\a ... isee 发表于 2019-4-22 00:18
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2025-7-15 14:50 GMT+8
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