Question

тем и сделай проверку:
б) 45 + (71 - b. 9) = 80.​

Answer 1

45 + (71 - b · 9) = 80

71 - 9b = 80 - 45

71 - 9b = 35

-9b = 35 - 71

-9b = -36

b = -36 ÷ (-9)

b = 4