Question

Реши уровнения 45×2+в=900.
В-45×2=900

Answer 1

в-900-(45•2)

B=800
---------------------
45•2+800=900

Answer 2

45*2 + b = 900
90 + b = 900
b=900 -90
b=810

b-45*2 = 900
b-90 = 900
b=900 + 90
b=990