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1 第16届IMO第5题是:确定下列和式的范围s_1=(a/a+b+d)+(b/a+b+c)+(c/b+c+d)+(d/a+c+d)其中a,b,c,d是任意正实数。
1 The 16th IMO Question 5 is: Determine the scope of the following sum formula: s_1=(a/a+b+d)+(b/a+b+c)+(c/b+c+d)+(d /a+c+d) where a,b,c,d are any positive real numbers.