1.300202:574=523
1002-523=479
479*305=149095
2.202*202=40804
826281:909=909
40804-909=39895
39895:505=79
603*79=47637
3.722*670=483740
484000-483740=260
618:6=103
260*103=26780
26780+1510
4.13860+2170=16030
16030-15430=600
286567:563=509
509*600=305400
305400:25=12216