$$2 { m }^{ 10 } { n }^{ 12 } .18 { m }^{ 12 } { n }^{ 11 }$$
$\frac{9m^{22}n^{23}}{25}$
$$2^{1}m^{10}n^{12}\times 0.18^{1}m^{12}n^{11}$$
$$2^{1}\times 0.18^{1}m^{10}m^{12}n^{12}n^{11}$$
$$2^{1}\times 0.18^{1}m^{10+12}n^{12+11}$$
$$2^{1}\times 0.18^{1}m^{22}n^{12+11}$$
$$2^{1}\times 0.18^{1}m^{22}n^{23}$$
$$0.36m^{22}n^{23}$$
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$\frac{198m^{21}n^{23}}{25}$
