197 825:25-7900+(100-9•9)-31=
= 197 825:25-7900+(100-81)-31 =
= 197 825:25-7900+19-31 =
= 7913-7900+19-31 =
= 13-12 =
= 1
(1966-777-88)•28+285:15 =
= 1101•28+19 =
= 30 828+19 =
= 30 847
[2093+15 236:13-(101-96)]:10+101 =
= (2093+ 15 236:13-5):10+101 =
= (2093+1172-5):10+101 =
= 3260:10+101 =
= 326+101 =
= 427
[(263•61+57):100+183]:2+90 =
= [(16 043+57):100+183]:2+90 =
= (16100:100+183):2+90 =
= (161+183):2+90 =
= 344:2+90 =
= 172+90 =
= 262
