Question

已知a,b为实数且ab=1,求a+1分之1 + b+1分之1的值

Answer 1

1/a+1+1/b+1

=(b+1+a+1)/(a+1)(b+1)

=(a+b+2)/(ab+a+b+1)

ab=1

原式=(a+b+2)/(a+b+2)=1

~望采纳