Question

已知abc=1,求ab+a+1分之a+bc+b+1分之b+ca+a+1分之c的值

Answer 1

a/(ab+a+1)+b/(bc+b+1)+c/(ca+c+1)

=a/(ab+a+abc)+b/(bc+b+1)+bc/(bca+bc+b)

=1/(b+1+bc)+b/(bc+b+1)+bc/(1+bc+b)

=1