А) (17, 52+1,085):1000=18,605:1000=0,018605
б) (21,12-12,213) :10=8,907:10=0,8907
в) 27:1000+0,399*100-74:10=0,027+39,9-7,4= 32,527
г) 0,75:300-0,035:700=0,0025-0,00005=0,00245
д) 0,45:500-0,024:800=0,0009-0,00003= 0,00087
е) 34,01:3401+18:0,18=0,01+100=100,01
ё) 28:0,028-9,1:0,0091=1000-1000=0
ж) 7,28560+5.68280=12,9684