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问题已知a,b都是正数,求证:2/(1/a+1/b)≤ab~(1/2)≤(a+b)/2≤((a~2+b~2)/2)~(1/2),记
The problem is known that both a and b are positive numbers. Prove that: 2/(1/a+1/b)≤ab~(1/2)≤(a+b)/2≤((a~2+b~2) /2)~(1/2), in mind