ab=1,求1/a+1 + b/b+1的值
问题描述:
ab=1,求1/a+1 + b/b+1的值
答
1/(a+1) + b/(b+1)
=(b+1+ab+b)/(ab+a+b+1)
=(ab+a+b+1)/(ab+a+b+1)
=1