240:(480:30-15)=
480:30=16
16-15=1
240:1=240
67×(40×10-399)=
40×10=400
400-399=1
67×1=67
А)49+51=100 56+72=128
б)59-34=25 66-42=24
в)7^2+2^2=49+4=53 9^2+7^2=81+49=130
г)
![(9+11)^{2}](https://tex.z-dn.net/?f=+%289%2B11%29%5E%7B2%7D+)
=
![20^{2}](https://tex.z-dn.net/?f=+20%5E%7B2%7D+)
=400
![(6+7)^{2}](https://tex.z-dn.net/?f=+%286%2B7%29%5E%7B2%7D+)
=
![13^{2}](https://tex.z-dn.net/?f=+13%5E%7B2%7D+)
=169
д)(5-3)^2=4 (6-4)^2= 4
ж)64+27=93 125+8=133
з)(13+7)3=20*20*20=8000 (5+6)3=11*11*11=1331
и)64-27=37 1 25-1=124
к) (49-46)3= 27 (56-52)3=4*4*4=64
87 % - 19140
13 - х
х = 13 * 19140\87 = 2860 удержали
19140 +2860 = 22000. рублей оклад