a) 12x10:4+(190-30):8+(202:2+33x3):100=
=120:4+160:8+(101+99):100=
=30+20+200:100=
=30+20+2=
=50+2=
=52
b) (9x7+7x8)x4-(404:4+44:4):2=
=(63+56)x4-(101+11):2=
=119x4-112:2=
=476-56=
=420
c) 1000-(250:2+25x3)x3-(25+15x5)x4=
=1000-(123+75)x3-(25+75)x4=
=1000-198x3-100x4=
=1000-594-400=
=406-400=
=6
e) 135+5000:(1385-385)+3x(40+8:2)=
=135+5000:1000+3x(40+4)=
=135+5+3x44=
=135+5+132=
=140+132=
=272
