$$9l^{4}m^{3}.6l^{2}m^{4}.3lm=$$
$\frac{81l^{7}m^{8}}{50}$
$$9l^{6}m^{3}\times 0.6m^{4}\times 0.3lm$$
$$9l^{7}m^{3}\times 0.6m^{4}\times 0.3m$$
$$9l^{7}m^{7}\times 0.6\times 0.3m$$
$$9l^{7}m^{8}\times 0.6\times 0.3$$
$$5.4l^{7}m^{8}\times 0.3$$
$$1.62l^{7}m^{8}$$
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$\frac{567l^{6}m^{8}}{50}$