1. 129000+800000-2000 = 927000
1) 129000+800000 = 929000
2) 929000-2000 = 927000
2. 503000-(360000-200000) = 343000
1) 360000-200000 = 160000
2) 503000-160000 = 343000
3. (600000-450000)+80000 = 230000
1) 600000-450000 = 150000
2) 150000+80000 = 230000