$$20xy^{2}.40x^{2}y^{2}$$
$8x^{3}y^{4}$
$$20^{1}x^{1}y^{2}\times 0.4^{1}x^{2}y^{2}$$
$$20^{1}\times 0.4^{1}x^{1}x^{2}y^{2}y^{2}$$
$$20^{1}\times 0.4^{1}x^{1+2}y^{2+2}$$
$$20^{1}\times 0.4^{1}x^{3}y^{2+2}$$
$$20^{1}\times 0.4^{1}x^{3}y^{4}$$
$$8x^{3}y^{4}$$
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$24x^{2}y^{4}$
