$$\frac { 3 } { 4 } + ( \frac { 4 } { 3 } - \frac { 1 } { 2 } + \frac { 2 } { 3 } + \frac { 4 } { 5 } )$$
$\frac{61}{20}=3.05$
$$\frac{9}{12}+\frac{16}{12}-\frac{1}{2}+\frac{2}{3}+\frac{4}{5}$$
$$\frac{9+16}{12}-\frac{1}{2}+\frac{2}{3}+\frac{4}{5}$$
$$\frac{25}{12}-\frac{1}{2}+\frac{2}{3}+\frac{4}{5}$$
$$\frac{25}{12}-\frac{6}{12}+\frac{2}{3}+\frac{4}{5}$$
$$\frac{25-6}{12}+\frac{2}{3}+\frac{4}{5}$$
$$\frac{19}{12}+\frac{2}{3}+\frac{4}{5}$$
$$\frac{19}{12}+\frac{8}{12}+\frac{4}{5}$$
$$\frac{19+8}{12}+\frac{4}{5}$$
$$\frac{27}{12}+\frac{4}{5}$$
$$\frac{9}{4}+\frac{4}{5}$$
$$\frac{45}{20}+\frac{16}{20}$$
$$\frac{45+16}{20}$$
$$\frac{61}{20}$$
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$\frac{61}{2 ^ {2} \cdot 5} = 3\frac{1}{20} = 3.05$
