a>b>0x=1/2[根号(a/b)+根号(b/a)]=1/2{根号[b^2/(ab)]+根号[b^2/(ab)]}=(a+b)/[2根号(ab)]2根号(ab)/x)-根号(x^2-1)=2根号(ab)*2根号(ab)/(a+b)-根号{(a+b)^2/(4ab)-1}=4ab/(a+b)-根号[(a-b)^2/(4ab)]=4ab/(a+b)-(a-b)/[2根号(ab)]=[8a^2b^2-(a^2-b^2)根号(ab)]/[2ab(a+b)]
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