Question

1.Jill and Katy _________________________with their class to

Answer 1

A be going to do sth. 将来做某事 A promise to do sht. 承诺做某事1由b+1/c=1得：b=1-1/c=(c-1)/c,则1/b=c/(c-1),

由c+1/a=1得：1/a=1-c,则a=1/(1-c),

因此

b/(ab+1)

=a+1/b

=1/(1-c)+c/(c-1)

=1/(1-c)-c/(1-c)

=(1-c)/(1-c)

=1