$$6 ( 5 x ^ { 3 } y - 500 x y ^ { 3 } ) , 20 ( x ^ { 3 } - 1000 y ^ { 3 } )$$
$-60xy\left(x^{2}-100y^{2}\right)\left(x^{2}+10xy+100y^{2}\right)$
$$-3000xy^{3}+30yx^{3}=30xy\left(-x-10y\right)\left(-x+10y\right)$$ $$20x^{3}-20000y^{3}=20\left(x-10y\right)\left(x^{2}+10xy+100y^{2}\right)$$
$$-60xy\left(x-10y\right)\left(x+10y\right)\left(x^{2}+10xy+100y^{2}\right)$$
$$60000x^{2}y^{4}+600000xy^{5}-600y^{2}x^{4}-60yx^{5}$$
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$30xy\left(x^{2}-100y^{2}\right),20\left(x^{3}-1000y^{3}\right)$
