设√(a/b)=t (t>0)式子=√ab-t-1/t+√(t²+1/t²+2) =√ab-t-1/t+√(t+1/t)² =√ab-t-1/t+(t+1/t) =√ab
√(ab),参考:http://zhidao.baidu.com/question/647064075712374645.html?oldq=1
将原式乘以根号下ab得:ab-a-b+a+b=ab再除以根号下ab得根号下ab