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2011年美国数学奥林匹克试题的第2题是一道代数不等式证明题,本文先给出两种换元证法,并顺便获得它的两个加强结果.
The second issue of the 2011 American Mathematical Olympiad is a proof of algebra inequalities. In this paper, we first give two kinds of substitutions and get the two strengthening results.