50 * (х: 16) = 40150 2700+у*400=170700 (12300-30) : k=30 (a+109) * 30=6510 d - (240*13) = 1260 n+1240=1060*20

50• (х: 16) = 40150

х: 16=40150:50

х: 16=803

х=803•16

х=12848

2700+y•400=170700

y•400=170700-2700

y•400=168000

y=168000:400

y=420

(12300-30) : k=30

12270:k=30

k=12270:30

k=409

(a+109) •30=6510

a+109=6510:30

a+109=217

a=217-109

a=108

d - (240•13) = 1260

d-3120=1260

d=3120+1260

d=4380

n+1240=1060•20

n+1240=21200

n=21200-1240

n=19960