PUMaC 2022 · 个人决赛（B 组） · 第 1 题
PUMaC 2022 — Individual Finals (Division B) — Problem 1
题目详情
- Let a, b, c, d be real numbers for which a + b + c + d = 1. Show the following inequality: p 2 2 2 2 a + b − c − d ≤ 2 + 4( ac + bd ) .
解析
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Original Explanation
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