a+b+2√ab=8√ab
(√a+√b)²=8√ab
a+b-2√ab=4√ab
(√a-√b)²=4√ab
所以(√a-√b)²/(√a+√b)²=4/8=1/2
a>b>0
所以√a-√b>0,√a+√b>0
所以(√a-√b)/(√a+√b)=√2/2