$$\frac{7}{8}\times3\frac{1}{5}\times4\frac{1}{2}$$
$\frac{63}{5}=12.6$
$$\frac{7}{8}\times \frac{15+1}{5}\times \frac{4\times 2+1}{2}$$
$$\frac{7}{8}\times \frac{16}{5}\times \frac{4\times 2+1}{2}$$
$$\frac{7\times 16}{8\times 5}\times \frac{4\times 2+1}{2}$$
$$\frac{112}{40}\times \frac{4\times 2+1}{2}$$
$$\frac{14}{5}\times \frac{4\times 2+1}{2}$$
$$\frac{14}{5}\times \frac{8+1}{2}$$
$$\frac{14}{5}\times \frac{9}{2}$$
$$\frac{14\times 9}{5\times 2}$$
$$\frac{126}{10}$$
$$\frac{63}{5}$$
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$\frac{3 ^ {2} \cdot 7}{5} = 12\frac{3}{5} = 12.6$
