$$- 1 \frac { 3 } { 5 } \cdot ( - m ) \cdot ( - 1 \frac { 1 } { 2 } n )$$
$-\frac{12mn}{5}$
$$\left(-\frac{5+3}{5}\right)\left(-m\right)\left(-\frac{1\times 2+1}{2}\right)n$$
$$-\frac{8}{5}\left(-m\right)\left(-\frac{2+1}{2}\right)n$$
$$-\frac{8}{5}\left(-m\right)\left(-\frac{3}{2}\right)n$$
$$\frac{-8\left(-3\right)}{5\times 2}\left(-m\right)n$$
$$\frac{24}{10}\left(-m\right)n$$
$$\frac{12}{5}\left(-m\right)n$$
$$-\frac{12}{5}mn$$
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