$$1\frac{2}{5}+2\frac{3}{6}+3\frac{6}{5}$$
$\frac{81}{10}=8.1$
$$\frac{5+2}{5}+\frac{2\times 6+3}{6}+\frac{3\times 5+6}{5}$$
$$\frac{7}{5}+\frac{2\times 6+3}{6}+\frac{3\times 5+6}{5}$$
$$\frac{7}{5}+\frac{12+3}{6}+\frac{3\times 5+6}{5}$$
$$\frac{7}{5}+\frac{15}{6}+\frac{3\times 5+6}{5}$$
$$\frac{7}{5}+\frac{5}{2}+\frac{3\times 5+6}{5}$$
$$\frac{14}{10}+\frac{25}{10}+\frac{3\times 5+6}{5}$$
$$\frac{14+25}{10}+\frac{3\times 5+6}{5}$$
$$\frac{39}{10}+\frac{3\times 5+6}{5}$$
$$\frac{39}{10}+\frac{15+6}{5}$$
$$\frac{39}{10}+\frac{21}{5}$$
$$\frac{39}{10}+\frac{42}{10}$$
$$\frac{39+42}{10}$$
$$\frac{81}{10}$$
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$\frac{3 ^ {4}}{2 \cdot 5} = 8\frac{1}{10} = 8.1$
