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《数学通报》2007年第5期上第1673号问题为:已知:(?),求证:x+y≥0.笔者发现此问题是第31届西班牙数学奥林匹克第2题的推广,赛题是本题取等号的特例.下面给出几种证法.
The issue of No. 1673 in the fifth issue of the “Mathematical Bulletin” (2007) No. 5 is: Known: (?), Proof: x+y≥0. The author finds that this issue is the promotion of Question 2 of the 31st Spanish Mathematical Olympiad. This is a special case of taking the equal sign.