$$5 / 7 + ( - 3 / 8 ) + ( - 4 / 7 ) + 9 / 8$$
$\frac{25}{28}\approx 0.892857143$
$$\frac{40}{56}-\frac{21}{56}-\frac{4}{7}+\frac{9}{8}$$
$$\frac{40-21}{56}-\frac{4}{7}+\frac{9}{8}$$
$$\frac{19}{56}-\frac{4}{7}+\frac{9}{8}$$
$$\frac{19}{56}-\frac{32}{56}+\frac{9}{8}$$
$$\frac{19-32}{56}+\frac{9}{8}$$
$$-\frac{13}{56}+\frac{9}{8}$$
$$-\frac{13}{56}+\frac{63}{56}$$
$$\frac{-13+63}{56}$$
$$\frac{50}{56}$$
$$\frac{25}{28}$$
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$\frac{5 ^ {2}}{2 ^ {2} \cdot 7} = 0.8928571428571429$
