Question

1,8b=3(b-0,12) методом весов пжлст

Answer 1

1,8b = 3(b-0.12)
1.8b = 3b-0.36 
1.8b-3b = -0.36
-1.2b=-0.36 | :(-1.2)
      b=0.3

Answer 2

спасибо

Answer 3

:)