$$\frac{-3}{6}\times\frac{7}{9}\times\frac{17}{12}\times(\frac{-13}{9})$$
$\frac{1547}{1944}\approx 0.795781893$
$$-\frac{1}{2}\times \frac{7}{9}\times \frac{17}{12}\times \frac{-13}{9}$$
$$\frac{-7}{2\times 9}\times \frac{17}{12}\times \frac{-13}{9}$$
$$\frac{-7}{18}\times \frac{17}{12}\times \frac{-13}{9}$$
$$-\frac{7}{18}\times \frac{17}{12}\times \frac{-13}{9}$$
$$\frac{-7\times 17}{18\times 12}\times \frac{-13}{9}$$
$$\frac{-119}{216}\times \frac{-13}{9}$$
$$-\frac{119}{216}\times \frac{-13}{9}$$
$$-\frac{119}{216}\left(-\frac{13}{9}\right)$$
$$\frac{-119\left(-13\right)}{216\times 9}$$
$$\frac{1547}{1944}$$
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$\frac{7 \cdot 13 \cdot 17}{2 ^ {3} \cdot 3 ^ {5}} = 0.7957818930041153$