$$12lm.8l^{2}n^{2}.144l^{2}m^{3}=$$
$\frac{864n^{2}m^{4}l^{5}}{625}$
$$12l^{3}m\times 0.8n^{2}\times 0.144l^{2}m^{3}$$
$$12l^{5}m\times 0.8n^{2}\times 0.144m^{3}$$
$$12l^{5}m^{4}\times 0.8n^{2}\times 0.144$$
$$9.6l^{5}m^{4}n^{2}\times 0.144$$
$$1.3824l^{5}m^{4}n^{2}$$
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$\frac{1728nm^{4}l^{5}}{625}$
