【正题】已知 a + 2b + 3c = 30 和 a + 3b + 5c =8, 求 a + b + c

来源: Yeli9008 于 2025-11-23 19:37:02 [博客] [旧帖] [给我悄悄话] 本文已被阅读：次

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【正题】 已知 a + 2b + 3c = 30 和 a + 3b + 5c =8, 求 a + b + c