90*50+12000-3780= 4500+12000-3780=20280
800.000:100-36*8=8000-288=7712
(187.000-18.400):100+27.800= 168600:100+27800=1686+27800= 29486
370.540+(1.000-84:7)=370540+(1000-12)= 370540+988=371528