1) 80*1-42:(50786-50780)*3 = 80*7-42 = 560-42 = 518 2) 7*4+64:8*(21-17)+30000 = 28+8*4+30000 = 28+32+30000 = 30060
1) 80*1-42:(50786-50780)*3 = 80*7-42 = 560-42 = 518 2) 7*4+64:8*(21-17)+30000 = 28+8*4+30000 = 28+32+30000 = 30060
1)80*7=560
2)560-42=518
(50786-50780)*9
1)50786-50780=6
2)6*9=54
7*4+64:8*(21-17)+30000
1)21-17=4
2)7*4=28
3)64:8=8
4)8*4=32
5)28+32=60
6)60+30000=30060