1) (581y×53):83-18y= 30793y:83-18y= 371y-18y= 353y
2) 84x:7+(107x+37x):12=12x+144x:12=12x+12x=24x
47,48,49,50,51,52,53,54,55.
Z/8.2=4,1
z=4,1*8,2
z=33.62
проверка
33,62/8,2=4,1
9+3,7=12,7
4,8+5=9,8
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