已知实数a,b满足ab=1,a/1+a+b/1+b求值,
问题描述:
已知实数a,b满足ab=1,a/1+a+b/1+b求值,
答
a/1+a+b/1+b=1/[1+1/a]+1/[1+1/b]=1/(1+b)+1/(1+a)=(a+b+2)/(1+a+b+ab)=1
[ab=1a=1/b b=1/a]
ok