6,2(5)=(625-62)/90=563/90
2intreg3/5=13/5
16intreg2/3=50/3
⇒563/90:2/3-{50/3-2[78+(2011+5/8x13/5)]}=
563/90x3/2-{50/3-2[78+2011+13/8)]}=
563/60-{50/3-2[78+(2011x8+13)/8)]}=
563/60-{50/3-2[78+16101/8]}=
563/60-[50/3-2[(78x8+16101)/8]}=
563/60-{50/3-2x16725/8}=
563/60-{50/3-16725/4}=
563/60-50/3+16725/4=
(563-50x20+16725x15)/60=
(563-1000+250875)/60=250438/60=4173,996)