1) 154*78 + 3900 : 65 − 216*53=
=12012+60-11448=12072-11448=624
2) 16 728 : 82 − 5580 : 45 + 726*29=
=204-124+21054=80+21054=21134
3) (39002 − 37 236)*205 + 115*78=
=1766*205+115*78=362030+8970=
=371000
4) 875*480 − 406*(50 004 − 48 986)=
=420000-406*1018=420000-413308=6692