由:1/a+1/b=5/a+b
得:(a+b)/ab=5/(a+b)
(a+b)^2=5ab
a^2+2ab+b^2=5ab
a^+b^2=3ab
因此:b/a+a/b
=(b/axab+a/bxab)/ab
=(a^2+b^2)/ab
=3ab/ab
=3
由:1/a+1/b=5/a+b
得:(a+b)/ab=5/(a+b)
(a+b)^2=5ab
a^2+2ab+b^2=5ab
a^+b^2=3ab
因此:b/a+a/b
=(b/axab+a/bxab)/ab
=(a^2+b^2)/ab
=3ab/ab
=3