$\left(13x+19y\right)\left(10x-9y\right)$
$700-631,1$
$( 6 x y ^ { 2 } ) ^ { 2 } ( - 3 x ^ { 2 } y ^ { 3 } ) ^ { 2 }$
$\left(2a^{-7}b^{4}\right)^{4}$
$\lim_{x\to\infty}\left(-3x^5+2x-4\right)$
$\frac{x^4}{x^3}$
$a+4b-5a-a$
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