$$9 l m n .72 l ^ { 3 } m ^ { 2 } n ^ { 1 } =$$
$\frac{162n^{2}m^{3}l^{4}}{25}$
$$9l^{4}mn\times 0.72m^{2}n^{1}$$
$$9l^{4}m^{3}n\times 0.72n^{1}$$
$$9l^{4}m^{3}n^{2}\times 0.72$$
$$6.48l^{4}m^{3}n^{2}$$
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$\frac{648n^{2}\left(lm\right)^{3}}{25}$
