1) (27×31+59×27)-[55:5+(17×2)-210:7]×10=
= (27×31+59×27)-[11+34-30]×10=
= 837+1593-(11+34-30}×10=
= 837+1593-15×10=
= 837+1593-150=
=2280
2) 245×1000-[(39×5+112:8)×10]:2+79=
= 245×1000-[(195+14)×10]:2+79=
=245000-2090:2+79=
=245000-1045+79=
=245000-1045+79=
=244034
3) (23×4+510)×3+[25×(721:7-576:8):5]=
= (92+510)×3+[25×(103-72):5]=
= 602×3+(25×31:5)=
=1806+155=1961