$$- \frac { 3 } { 11 } \frac { - 1 } { 13 }$$
$\frac{3}{143}\approx 0.020979021$
$$-\frac{3}{11}\left(-\frac{1}{13}\right)$$
$$\frac{-3\left(-1\right)}{11\times 13}$$
$$\frac{3}{143}$$
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$\frac{3}{11 \cdot 13} = 0.02097902097902098$