30075:401= 75
73278:354 = 207
83*502 = 41666
207*61 = 12627
180-(90-160:4)*2 = 180-50*2=180-100=80
20*6-40+200:20*3 = 120-40+30= 110
1) 30075:401=75
2) 73278:354=207
3) 83*502=41,666
4) 207*61=12,627
5) 180-(90-160:4)*2= 180-(90-40)*2= 180-180-80=-80
6) 20*6-40+200:20*3= 120-40+200:60= 80+3,3= 83,3
