The given expression can be simplified as follows:
3b(a - b) - 5(0.8c - 0.9d) - 1/9(3x - 4y)
Expanding the terms:= 3ab - 3b^2 - 4c + 4.5d - 1/3x + 4/9y
Therefore, the simplified expression is:3ab - 3b^2 - 4c + 4.5d - 1/3x + 4/9y
The given expression can be simplified as follows:
3b(a - b) - 5(0.8c - 0.9d) - 1/9(3x - 4y)
Expanding the terms:
= 3ab - 3b^2 - 4c + 4.5d - 1/3x + 4/9y
Therefore, the simplified expression is:
3ab - 3b^2 - 4c + 4.5d - 1/3x + 4/9y