(0.1997-1)*0.19971997-0.1997*0.1997
=0.1997*0.19971997-0.19971997-0.1997*0.1997
=(0.19971997-0.1997)*0.1997-0.19971997
=(0.00001997)*0.1997-0.19971997
(0.1997-1)*0.19971997-0.1997*0.1997
=0.1997*0.19971997-0.19971997-0.1997*0.1997
=(0.19971997-0.1997)*0.1997-0.19971997
=(0.00001997)*0.1997-0.19971997