(90-n):17=14
90-n=14*17
90-n=238
n=90-238
n=-148
256-х = 200
х = 256-200
х = 56
10106 - (8508 - 3469) = 10106 - 5039 = 5067
31010 - (5000 - 3774) = 31010 - 1226 = 29784
(1000 + 200) / 20 * 5 = 1200 / 100 = 12
(4000 - 500 / 100) * 10 = (4000 - 5) * 10 = 3995 * 10 = 39950
1)8,671-2,271=6,4
2)600*6,4=3840
3)3840*2,05=7872
4)7872+7,68=7879,68