$$-\frac{1}{7}\cdot\frac{3}{8}+\frac{1}{4}\cdot\frac{5}{8}$$
$\frac{23}{224}\approx 0.102678571$
$$\frac{-3}{7\times 8}+\frac{1}{4}\times \frac{5}{8}$$
$$\frac{-3}{56}+\frac{1}{4}\times \frac{5}{8}$$
$$-\frac{3}{56}+\frac{1}{4}\times \frac{5}{8}$$
$$-\frac{3}{56}+\frac{1\times 5}{4\times 8}$$
$$-\frac{3}{56}+\frac{5}{32}$$
$$-\frac{12}{224}+\frac{35}{224}$$
$$\frac{-12+35}{224}$$
$$\frac{23}{224}$$
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$\frac{23}{2 ^ {5} \cdot 7} = 0.10267857142857142$
