(362+548*361) /(362*548-186)
=(362+548*362-548) /(362*548-186)
=(548*362-548) /(362*548-186)
=1
(204+584*1991)/(1992*584-380) -13/12
=(204+584*1992-584)/(1992*584-380) -13/12\
=(584*1992-380)/(1992*584-380) -13/12
=1-13/12
= -1/12