$$[ ( \frac { - 2 } { 7 } ) \times ( \frac { - 4 } { 9 } ) ] + [ ( \frac { - 3 } { 5 } ) \times ( \frac { - 4 } { 9 } ) ]$$
$\frac{124}{315}\approx 0.393650794$
$$-\frac{2}{7}\times \frac{-4}{9}+\frac{-3}{5}\times \frac{-4}{9}$$
$$-\frac{2}{7}\left(-\frac{4}{9}\right)+\frac{-3}{5}\times \frac{-4}{9}$$
$$\frac{-2\left(-4\right)}{7\times 9}+\frac{-3}{5}\times \frac{-4}{9}$$
$$\frac{8}{63}+\frac{-3}{5}\times \frac{-4}{9}$$
$$\frac{8}{63}-\frac{3}{5}\times \frac{-4}{9}$$
$$\frac{8}{63}-\frac{3}{5}\left(-\frac{4}{9}\right)$$
$$\frac{8}{63}+\frac{-3\left(-4\right)}{5\times 9}$$
$$\frac{8}{63}+\frac{12}{45}$$
$$\frac{8}{63}+\frac{4}{15}$$
$$\frac{40}{315}+\frac{84}{315}$$
$$\frac{40+84}{315}$$
$$\frac{124}{315}$$
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$\frac{2 ^ {2} \cdot 31}{3 ^ {2} \cdot 5 \cdot 7} = 0.39365079365079364$
