Evaluate: (a) 2.4 (0.123 - 0.095) 0.009 / (0.015 * (0.042 + 0.030)); (b) Simplify: 1 3/4 + [5 - 2 3/4 / 3/5] - [ (3-1)/5 of 4 1/2 ]

$$0.123 - 0.095 = 0.028$$ $$0.042 + 0.030 = 0.072$$

$$2.4 \times 0.028 = 0.0672$$ $$0.0672 \times 0.009 = 0.0006048$$

$$\frac{0.0006048}{0.00108} = 0.56$$

The evaluated value is $\boxed{0.56}$.

$$1\frac{3}{4} = \frac{1 \times 4 + 3}{4} = \frac{7}{4}$$ $$2\frac{3}{4} = \frac{2 \times 4 + 3}{4} = \frac{11}{4}$$ $$4\frac{1}{2} = \frac{4 \times 2 + 1}{2} = \frac{9}{2}$$ $$\frac{3-1}{5} = \frac{2}{5}$$

The expression becomes:

$$\frac{7}{4} + \left[5 - \frac{11}{4} \div \frac{3}{5}\right] - \left[\frac{2}{5} \text{ of } \frac{9}{2}\right]$$

$$\frac{11}{4} \div \frac{3}{5} = \frac{11}{4} \times \frac{5}{3} = \frac{55}{12}$$

The expression becomes:

$$\frac{7}{4} + \left[5 - \frac{55}{12}\right] - \left[\frac{2}{5} \text{ of } \frac{9}{2}\right]$$

$$5 - \frac{55}{12} = \frac{5 \times 12}{12} - \frac{55}{12} = \frac{60}{12} - \frac{55}{12} = \frac{5}{12}$$

The expression becomes:

$$\frac{7}{4} + \frac{5}{12} - \left[\frac{2}{5} \text{ of } \frac{9}{2}\right]$$

$$\frac{2}{5} \text{ of } \frac{9}{2} = \frac{2}{5} \times \frac{9}{2} = \frac{18}{10} = \frac{9}{5}$$

The expression becomes:

$$\frac{7}{4} + \frac{5}{12} - \frac{9}{5}$$

Convert the fractions.

$$\frac{7}{4} = \frac{7 \times 15}{4 \times 15} = \frac{105}{60}$$ $$\frac{5}{12} = \frac{5 \times 5}{12 \times 5} = \frac{25}{60}$$ $$\frac{9}{5} = \frac{9 \times 12}{5 \times 12} = \frac{108}{60}$$

The expression becomes:

$$\frac{105}{60} + \frac{25}{60} - \frac{108}{60}$$

$$\frac{22}{60} = \frac{11}{30}$$

The simplified value is $\boxed{\frac{11}{30}}$.