457001+562999-(308*407+118708:236)=894141
1) 308*407=125356
2) 118708:236=503
3) 125356+503=125859
4) 562999-125859=437140
5) 457001+437140=894141
(300200000-179616376):406*4+999047=
1) 300200000-179616376=120583624
2) 120583624:406=297004
3)297004*4 =1188016
4) 1188016+999047= 2187063