$$2n^{2}.2m^{4}n^{3}.-3m^{3}$$
$\frac{2m^{4}n^{5}}{5}$
$$2n^{5}\times 0.2m^{4}$$
$$0.4n^{5}m^{4}$$
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$\frac{8m^{3}n^{5}}{5}$
