1) 9 / (b² + 3b) - 3 / b = 3 / b*(3 / (b + 3) - 1) = 3 / b*(3 - b - 3 / (b+3)) =
= 3 / b * -b / (b+3) = -3 / (b + 3)
2) 8b + (5 - 9b²) / b = 8b + 5/b - 9b = 5/b - b
1) 9 / (b² + 3b) - 3 / b = 3 / b*(3 / (b + 3) - 1) = 3 / b*(3 - b - 3 / (b+3)) =
= 3 / b * -b / (b+3) = -3 / (b + 3)
2) 8b + (5 - 9b²) / b = 8b + 5/b - 9b = 5/b - b