$$\frac { 2 } { 5 } \times \frac { 1 } { 8 } + \frac { 3 } { 8 } \times \frac { 2 } { 7 } - \frac { 1 } { 7 }$$
$\frac{1}{70}\approx 0.014285714$
$$\frac{2\times 1}{5\times 8}+\frac{3}{8}\times \frac{2}{7}-\frac{1}{7}$$
$$\frac{2}{40}+\frac{3}{8}\times \frac{2}{7}-\frac{1}{7}$$
$$\frac{1}{20}+\frac{3}{8}\times \frac{2}{7}-\frac{1}{7}$$
$$\frac{1}{20}+\frac{3\times 2}{8\times 7}-\frac{1}{7}$$
$$\frac{1}{20}+\frac{6}{56}-\frac{1}{7}$$
$$\frac{1}{20}+\frac{3}{28}-\frac{1}{7}$$
$$\frac{7}{140}+\frac{15}{140}-\frac{1}{7}$$
$$\frac{7+15}{140}-\frac{1}{7}$$
$$\frac{22}{140}-\frac{1}{7}$$
$$\frac{11}{70}-\frac{1}{7}$$
$$\frac{11}{70}-\frac{10}{70}$$
$$\frac{11-10}{70}$$
$$\frac{1}{70}$$
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$\frac{1}{2 \cdot 5 \cdot 7} = 0.014285714285714285$
