$$9 { x }^{ 4 } { y }^{ 5 } .12 { x }^{ 7 } { y }^{ 10 }$$
$\frac{27x^{11}y^{15}}{25}$
$$9^{1}x^{4}y^{5}\times 0.12^{1}x^{7}y^{10}$$
$$9^{1}\times 0.12^{1}x^{4}x^{7}y^{5}y^{10}$$
$$9^{1}\times 0.12^{1}x^{4+7}y^{5+10}$$
$$9^{1}\times 0.12^{1}x^{11}y^{5+10}$$
$$9^{1}\times 0.12^{1}x^{11}y^{15}$$
$$1.08x^{11}y^{15}$$
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$\frac{297x^{10}y^{15}}{25}$
