1)
1. 90*70=6300
2. 735289-6300=728989
3. 728989+127365=856378
2)
1. 480207-45690=434517
2. 434517-34517=400000
3. 400000:2=200000
3)
1. 540:9=60
2. 60*500=30000
3. 30000-18289=11711
4. 11711*100=1171100
4)
1. 12003-11998=5
2. 5*70000=350000
3. 350000-347=349653
5)
1. 80360-79800=560
2. 560:8=70
3. 70*300=21000
6)
1. 320*20=6400
2. 6400+275837=282237
3. 282837-39800=243037
7)
1. 570*30=17100
2. 1380245-17100=1273145
3. 1273145-3145=1270000
8)
1. 420:7=60
2. 60*8000=480000
3. 480000-479000=1
4. 1-1=0